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Danfoss Scroll for Refrigeration MLM MLZ
50 - 60 Hz - R404A - R507 - R134a - R22 - R407A - R407F
Application guidelines
httpdanfossuscom
Application guideline
4 FRCCPC015A722
Contents
Features 6
Scroll compression principle 7The scroll compression process7
Compressor model designation 8Nomenclature 8Label 8
Technical specifications 950 Hz 960 Hz 11R404A R507 13R22 14R134a 15R407A 16R407F 17
Dimensions 18MLZMLM015-019-021-026 18MLZMLM030-038-045-048 19Oil sight glass 21Schrader 21Suction and discharge connections 21
Electrical data connections and wiring 22Motor voltage 22Wiring connections 22IP rating 22Three phase electrical characteristics 23Single phase electrical characteristics 23LRA (Locked Rotor Amp) 24MCC (Maximum Continuous Current) 24Max Oper A (Maximum Operating Amp) 24Winding resistance 24Electrical connections 24Nominal capacitor value and relays 25Three phase 26Internal motor protection 26Phase sequence and reverse rotation protection 26Voltage imbalance 26
Approvals and certifications 27Approvals and certificates 27Conformity to directives 27Internal free volume 27
Operating conditions 28Refrigerant and lubricants 28Motor supply 30Compressor ambient temperature 30Application envelope 30Maximum discharge gas temperature 34High and low pressure protection 35Onoff cycling (cycle rate limit) 35
Application guideline
5FRCCPC015A722
Contents
System design recommendations 36General 36Essential piping design considerations 36Refrigerant charge limit 37Off-cycle migration 37Liquid flood back 39
Specific application recommendations 40Low ambient application 40Scroll and reciprocating 40Low load operations 41Brazed plate heat exchangers 41Water utilising systems 41
Sound and vibration management 42Starting sound level 42Running sound level 42Stopping sound level 42Sound generation in a refrigeration system 42Compressor sound radiation 42Mechanical vibrations 43Gas pulsation 43
Installation 44System cleanliness 44Compressor handling and storage 44Compressor mounting 44Compressor holding charge 44Tube brazing procedure 44Brazing material 44Vacuum evacuation and moisture removal 46Liquid line filter driers 46Refrigerant charging 46Insulation resistance and dielectric strength 46
Ordering information and packaging 47Packaging 47Packaging details 47Single pack 48Industrial pack 49
Spare parts amp accessories 50
Application guideline
6 FRCCPC015A722
Features
With its unique scroll design and manufacturing process flexibility the new Danfoss MLZMLM refrigeration compressor offers a highly efficient solution for demanding refrigeration applications
This new family of refrigeration compressors includes 12 sizes of medium temperature scroll compressors designed for commercial
refrigeration applications These compressors are engineered for refrigeration and offer cooling capacity from 15000 to 76000 Btuh at common voltages and frequencies as well as any of the common refri-gerants (R404A - R134a - R507 - R22 - R407A - R407F) MLZ are only qualified with the above 6 refrigerants MLM is to be used only with R22 Be sure you have selected a qualified refrigerant for this range of compressors
Thanks to its dedicated refrigeration design the MLZMLM scroll compressor delivers a number of powerful advantages With its high efficiency motor and optimised scroll design it reduces
energy cost in normal operating conditions and delivers high capacity and an optimised pressure ratio for refrigeration applications
fixed scroll
check valve retainer
flat check valve
orbiting scroll
Application guideline
7FRCCPC015A722
Scroll compression principle
The scroll compression process
The entire scroll compression process is illustrated below The centre of the orbiting scroll traces a circular path around the centre of the fixed scroll This movement creates compression pockets between the two scroll elements
Low pressure suction gas is trapped within each crescent-shaped pocket as it forms continuous motion of the orbiting scroll serves to seal the pocket which decreases in volume as the
pocket moves towards the centre of the scroll set with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre
Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultaneously another is being discharged
Danfoss scroll compressors are manufactured using the most advanced machining assembly and process control techniques In design of both the compressor and the factory very high
standards of reliability and process control were first priority The result is a highly efficient product with the highest reliability obtainable and a low sound level
SUCTION
COMPRESSION
DISCHARGE
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
4 FRCCPC015A722
Contents
Features 6
Scroll compression principle 7The scroll compression process7
Compressor model designation 8Nomenclature 8Label 8
Technical specifications 950 Hz 960 Hz 11R404A R507 13R22 14R134a 15R407A 16R407F 17
Dimensions 18MLZMLM015-019-021-026 18MLZMLM030-038-045-048 19Oil sight glass 21Schrader 21Suction and discharge connections 21
Electrical data connections and wiring 22Motor voltage 22Wiring connections 22IP rating 22Three phase electrical characteristics 23Single phase electrical characteristics 23LRA (Locked Rotor Amp) 24MCC (Maximum Continuous Current) 24Max Oper A (Maximum Operating Amp) 24Winding resistance 24Electrical connections 24Nominal capacitor value and relays 25Three phase 26Internal motor protection 26Phase sequence and reverse rotation protection 26Voltage imbalance 26
Approvals and certifications 27Approvals and certificates 27Conformity to directives 27Internal free volume 27
Operating conditions 28Refrigerant and lubricants 28Motor supply 30Compressor ambient temperature 30Application envelope 30Maximum discharge gas temperature 34High and low pressure protection 35Onoff cycling (cycle rate limit) 35
Application guideline
5FRCCPC015A722
Contents
System design recommendations 36General 36Essential piping design considerations 36Refrigerant charge limit 37Off-cycle migration 37Liquid flood back 39
Specific application recommendations 40Low ambient application 40Scroll and reciprocating 40Low load operations 41Brazed plate heat exchangers 41Water utilising systems 41
Sound and vibration management 42Starting sound level 42Running sound level 42Stopping sound level 42Sound generation in a refrigeration system 42Compressor sound radiation 42Mechanical vibrations 43Gas pulsation 43
Installation 44System cleanliness 44Compressor handling and storage 44Compressor mounting 44Compressor holding charge 44Tube brazing procedure 44Brazing material 44Vacuum evacuation and moisture removal 46Liquid line filter driers 46Refrigerant charging 46Insulation resistance and dielectric strength 46
Ordering information and packaging 47Packaging 47Packaging details 47Single pack 48Industrial pack 49
Spare parts amp accessories 50
Application guideline
6 FRCCPC015A722
Features
With its unique scroll design and manufacturing process flexibility the new Danfoss MLZMLM refrigeration compressor offers a highly efficient solution for demanding refrigeration applications
This new family of refrigeration compressors includes 12 sizes of medium temperature scroll compressors designed for commercial
refrigeration applications These compressors are engineered for refrigeration and offer cooling capacity from 15000 to 76000 Btuh at common voltages and frequencies as well as any of the common refri-gerants (R404A - R134a - R507 - R22 - R407A - R407F) MLZ are only qualified with the above 6 refrigerants MLM is to be used only with R22 Be sure you have selected a qualified refrigerant for this range of compressors
Thanks to its dedicated refrigeration design the MLZMLM scroll compressor delivers a number of powerful advantages With its high efficiency motor and optimised scroll design it reduces
energy cost in normal operating conditions and delivers high capacity and an optimised pressure ratio for refrigeration applications
fixed scroll
check valve retainer
flat check valve
orbiting scroll
Application guideline
7FRCCPC015A722
Scroll compression principle
The scroll compression process
The entire scroll compression process is illustrated below The centre of the orbiting scroll traces a circular path around the centre of the fixed scroll This movement creates compression pockets between the two scroll elements
Low pressure suction gas is trapped within each crescent-shaped pocket as it forms continuous motion of the orbiting scroll serves to seal the pocket which decreases in volume as the
pocket moves towards the centre of the scroll set with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre
Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultaneously another is being discharged
Danfoss scroll compressors are manufactured using the most advanced machining assembly and process control techniques In design of both the compressor and the factory very high
standards of reliability and process control were first priority The result is a highly efficient product with the highest reliability obtainable and a low sound level
SUCTION
COMPRESSION
DISCHARGE
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
5FRCCPC015A722
Contents
System design recommendations 36General 36Essential piping design considerations 36Refrigerant charge limit 37Off-cycle migration 37Liquid flood back 39
Specific application recommendations 40Low ambient application 40Scroll and reciprocating 40Low load operations 41Brazed plate heat exchangers 41Water utilising systems 41
Sound and vibration management 42Starting sound level 42Running sound level 42Stopping sound level 42Sound generation in a refrigeration system 42Compressor sound radiation 42Mechanical vibrations 43Gas pulsation 43
Installation 44System cleanliness 44Compressor handling and storage 44Compressor mounting 44Compressor holding charge 44Tube brazing procedure 44Brazing material 44Vacuum evacuation and moisture removal 46Liquid line filter driers 46Refrigerant charging 46Insulation resistance and dielectric strength 46
Ordering information and packaging 47Packaging 47Packaging details 47Single pack 48Industrial pack 49
Spare parts amp accessories 50
Application guideline
6 FRCCPC015A722
Features
With its unique scroll design and manufacturing process flexibility the new Danfoss MLZMLM refrigeration compressor offers a highly efficient solution for demanding refrigeration applications
This new family of refrigeration compressors includes 12 sizes of medium temperature scroll compressors designed for commercial
refrigeration applications These compressors are engineered for refrigeration and offer cooling capacity from 15000 to 76000 Btuh at common voltages and frequencies as well as any of the common refri-gerants (R404A - R134a - R507 - R22 - R407A - R407F) MLZ are only qualified with the above 6 refrigerants MLM is to be used only with R22 Be sure you have selected a qualified refrigerant for this range of compressors
Thanks to its dedicated refrigeration design the MLZMLM scroll compressor delivers a number of powerful advantages With its high efficiency motor and optimised scroll design it reduces
energy cost in normal operating conditions and delivers high capacity and an optimised pressure ratio for refrigeration applications
fixed scroll
check valve retainer
flat check valve
orbiting scroll
Application guideline
7FRCCPC015A722
Scroll compression principle
The scroll compression process
The entire scroll compression process is illustrated below The centre of the orbiting scroll traces a circular path around the centre of the fixed scroll This movement creates compression pockets between the two scroll elements
Low pressure suction gas is trapped within each crescent-shaped pocket as it forms continuous motion of the orbiting scroll serves to seal the pocket which decreases in volume as the
pocket moves towards the centre of the scroll set with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre
Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultaneously another is being discharged
Danfoss scroll compressors are manufactured using the most advanced machining assembly and process control techniques In design of both the compressor and the factory very high
standards of reliability and process control were first priority The result is a highly efficient product with the highest reliability obtainable and a low sound level
SUCTION
COMPRESSION
DISCHARGE
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
6 FRCCPC015A722
Features
With its unique scroll design and manufacturing process flexibility the new Danfoss MLZMLM refrigeration compressor offers a highly efficient solution for demanding refrigeration applications
This new family of refrigeration compressors includes 12 sizes of medium temperature scroll compressors designed for commercial
refrigeration applications These compressors are engineered for refrigeration and offer cooling capacity from 15000 to 76000 Btuh at common voltages and frequencies as well as any of the common refri-gerants (R404A - R134a - R507 - R22 - R407A - R407F) MLZ are only qualified with the above 6 refrigerants MLM is to be used only with R22 Be sure you have selected a qualified refrigerant for this range of compressors
Thanks to its dedicated refrigeration design the MLZMLM scroll compressor delivers a number of powerful advantages With its high efficiency motor and optimised scroll design it reduces
energy cost in normal operating conditions and delivers high capacity and an optimised pressure ratio for refrigeration applications
fixed scroll
check valve retainer
flat check valve
orbiting scroll
Application guideline
7FRCCPC015A722
Scroll compression principle
The scroll compression process
The entire scroll compression process is illustrated below The centre of the orbiting scroll traces a circular path around the centre of the fixed scroll This movement creates compression pockets between the two scroll elements
Low pressure suction gas is trapped within each crescent-shaped pocket as it forms continuous motion of the orbiting scroll serves to seal the pocket which decreases in volume as the
pocket moves towards the centre of the scroll set with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre
Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultaneously another is being discharged
Danfoss scroll compressors are manufactured using the most advanced machining assembly and process control techniques In design of both the compressor and the factory very high
standards of reliability and process control were first priority The result is a highly efficient product with the highest reliability obtainable and a low sound level
SUCTION
COMPRESSION
DISCHARGE
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
7FRCCPC015A722
Scroll compression principle
The scroll compression process
The entire scroll compression process is illustrated below The centre of the orbiting scroll traces a circular path around the centre of the fixed scroll This movement creates compression pockets between the two scroll elements
Low pressure suction gas is trapped within each crescent-shaped pocket as it forms continuous motion of the orbiting scroll serves to seal the pocket which decreases in volume as the
pocket moves towards the centre of the scroll set with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre
Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultaneously another is being discharged
Danfoss scroll compressors are manufactured using the most advanced machining assembly and process control techniques In design of both the compressor and the factory very high
standards of reliability and process control were first priority The result is a highly efficient product with the highest reliability obtainable and a low sound level
SUCTION
COMPRESSION
DISCHARGE
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
8 FRCCPC015A722
Compressor model designation
Label
Nomenclature
Type FeaturesMotorSize
M LZ P 9T 4 L021Application
M medium temperature refrigeration
Family Refrigerant amp lubricantLZ R404A - R507 - R134a - R22 - R407A - R407F PVE lubricantLM R22 alkylbenzene lubricant
Nominal capacityIn thousand Btuh at 60 HzARI MBP conditions
Model variationT design optimised for refrigeration
Motor protectionL internal motor protection
Tubing and electrical connectionsP brazed connections spade terminalsC brazed connections screw terminalsT rotolock connections spade terminalsQ rotolock connections screws terminals
Motor voltage code1 208-230V1~60 Hz2 200-220V3~50 Hz amp 208-230V3~60 Hz4 380-400V3~50 Hz amp 460V3~60 Hz5 220-240V1~50 Hz 7 500V3~50 Hz amp 575V 3~60 Hz9 380V3~60 Hz
Spade terminals
Screw terminals
Other features
Oil sight glass
Oil equali-sation
Oil drain
LP gauge port
Gas equalisa-tion port
9 None Schrader None NoneThreaded
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
9FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 3300 11300 175 189 645 206 208 36 68
MLZ019 25 4500 18800 216 206 703 266 267 36 68
MLZ021 3 4700 19800 227 208 710 282 284 36 68
MLZ026 35 5800 24600 290 2 683 349 351 36 68
MLZ030 4 7100 29000 335 211 720 420 423 53 82
MLZ038 5 8400 34800 386 219 747 494 498 53 82
MLZ042 55 9500 40300 472 202 689 568 572 53 82
MLZ045 6 10200 42300 489 209 713 602 606 53 82
MLZ048 7 11200 46100 538 209 713 656 660 53 82
MLZ058 75 13000 53600 608 213 727 769 774 90 97
MLZ066 9 15100 62800 701 215 734 908 914 90 100
MLZ076 10 17300 71300 793 218 744 991 998 90 100
R134
a
MLZ015 2 2000 6800 102 194 662 206 208 36 68
MLZ019 25 2500 18800 128 198 676 266 267 36 68
MLZ021 3 2700 19800 133 204 696 282 284 36 68
MLZ026 35 3300 24600 162 205 700 349 351 36 68
MLZ030 4 4000 29000 193 209 713 420 423 53 82
MLZ038 5 4700 34800 234 202 689 494 498 53 82
MLZ042 55 5300 40300 274 195 666 568 572 53 82
MLZ045 6 5800 42300 269 217 741 602 606 53 82
MLZ048 7 6200 46100 291 213 727 656 660 53 82
MLZ058 75 7400 53600 361 205 700 769 774 90 97
MLZ066 9 8600 62800 410 21 717 908 914 90 100
MLZ076 10 9600 71300 467 205 700 991 998 90 100
R22
MLZMLM015 2 3300 11300 153 215 734 206 208 36 68
MLZMLM019 25 4300 18800 187 23 785 266 267 36 68
MLZMLM021 3 4600 19800 202 227 775 282 284 36 68
MLZMLM026 35 5700 24600 243 233 795 349 351 36 68
MLZMLM030 4 6800 29000 293 233 795 420 423 53 82
MLZMLM038 5 8100 34800 345 234 799 494 498 53 82
MLZMLM042 55 9100 40300 423 215 734 568 572 53 82
MLZMLM045 6 9300 42300 414 224 765 602 606 53 82
MLZMLM048 7 10600 46100 453 233 795 656 660 53 82
MLZMLM058 75 12300 53600 529 233 795 769 774 90 97
MLZMLM066 9 14100 62800 594 238 812 908 914 90 100
MLZMLM076 10 16600 71300 696 238 812 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degF Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
10 FRCCPC015A722
Technical specifications
50 Hz
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3000 10200 155 194 662 206 208 36 68
MLZ019 25 3900 18800 204 191 652 266 267 36 68
MLZ021 3 4100 19800 221 186 635 282 284 36 68
MLZ026 35 5200 24600 271 191 652 349 351 36 68
MLZ030 4 6300 29000 299 211 720 420 423 53 82
MLZ038 5 7300 34800 347 21 717 494 498 53 82
MLZ042 6 8400 42300 453 185 631 602 572 53 82
MLZ045 6 8900 42300 455 196 669 602 606 53 82
MLZ048 7 9800 46100 501 195 666 656 660 53 82
MLZ058 75 11200 53600 569 197 672 769 774 90 97
MLZ066 9 13100 62800 678 193 659 908 914 90 100
MLZ076 10 14300 71300 751 191 652 991 998 90 100
R407
F
MLZ015 2 3300 11300 166 197 672 206 208 36 68
MLZ019 25 4200 18800 219 194 662 266 267 36 68
MLZ021 3 4500 19800 237 189 645 282 284 36 68
MLZ026 35 5600 24600 290 194 662 349 351 36 68
MLZ030 4 6800 29000 320 214 730 420 423 53 82
MLZ038 5 7900 34800 372 213 727 494 498 53 82
MLZ042 6 9100 42300 485 187 638 602 572 53 82
MLZ045 6 9700 42300 487 199 679 602 606 53 82
MLZ048 7 10600 46100 537 198 676 656 660 53 82
MLZ058 75 12200 53600 609 2 683 769 774 90 97
MLZ066 9 14200 62800 726 196 669 908 914 90 100
MLZ076 10 15600 71300 804 194 662 991 998 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 5 220-240V1~50 Hz
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
11FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R404
A
MLZ015 2 4100 14000 210 194 662 206 250 36 68
MLZ019 25 5500 18800 258 211 720 266 323 36 68
MLZ021 3 5800 19800 274 213 727 282 343 36 68
MLZ026 35 7200 24600 344 21 717 349 424 36 68
MLZ030 4 8500 29000 390 218 744 420 510 53 82
MLZ038 5 10200 34800 470 218 744 494 600 53 82
MLZ042 55 11800 40300 573 207 706 568 690 53 82
MLZ045 6 12400 42300 564 219 747 602 731 53 82
MLZ048 7 13500 46100 615 22 751 656 797 53 82
MLZ058 75 15700 53600 735 214 730 769 934 90 97
MLZ066 9 18400 62800 840 218 744 908 1104 90 100
MLZ076 10 20900 71300 959 218 744 991 1205 90 100
R134
a
MLZ015 2 2400 8200 119 204 696 206 250 36 68
MLZ019 25 3100 18800 153 203 693 266 323 36 68
MLZ021 3 3300 19800 158 21 717 282 343 36 68
MLZ026 35 4100 24600 191 214 730 349 424 36 68
MLZ030 4 4900 29000 235 21 717 420 510 53 82
MLZ038 5 5800 34800 280 208 710 494 600 53 82
MLZ042 55 6500 40300 333 194 662 568 690 53 82
MLZ045 6 7100 42300 332 213 727 602 731 53 82
MLZ048 7 7600 46100 354 213 727 656 797 53 82
MLZ058 75 9100 53600 428 212 724 769 934 90 97
MLZ066 9 10400 62800 485 215 734 908 1104 90 100
MLZ076 10 11700 71300 561 209 713 991 1205 90 100
R22
MLZMLM015 2 3900 13300 174 226 771 206 250 36 68
MLZMLM019 25 5200 18800 222 237 809 266 323 36 68
MLZMLM021 3 5600 19800 236 236 805 282 343 36 68
MLZMLM026 35 7000 24600 293 239 816 349 424 36 68
MLZMLM030 4 8200 29000 346 236 805 420 510 53 82
MLZMLM038 5 9600 34800 406 236 805 494 600 53 82
MLZMLM042 55 10900 40300 500 218 744 568 690 53 82
MLZMLM045 6 11700 42300 491 238 812 602 731 53 82
MLZMLM048 7 12900 46100 536 24 819 656 797 53 82
MLZMLM058 75 14900 53600 634 234 799 769 934 90 97
MLZMLM066 9 17000 62800 714 238 812 908 1104 90 100
MLZMLM076 10 20100 71300 840 239 816 991 1205 90 100
at EN12900 conditions To= 14degC Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance data To= 14degC Tc= 113degF SH=18degF SC= 0degFMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
12 FRCCPC015A722
Technical specifications
Model HP
Nominalcooling capacity
Powerinput
Efficiency Swept volume Displacement Oil charge Net weight
(with oil)COP EER
W Btuh kW WW BtuhW cuinrev cufth oz lbs
R407
A
MLZ015 2 3700 12600 185 199 679 206 250 36 68
MLZ019 25 4800 18800 240 2 683 266 323 36 68
MLZ021 3 5100 19800 263 195 666 282 343 36 68
MLZ026 35 6300 24600 310 202 689 349 424 36 68
MLZ030 4 7700 29000 352 219 747 420 510 53 82
MLZ038 5 8900 34800 410 218 744 494 600 53 82
MLZ045 6 10900 42300 537 203 693 602 731 53 82
MLZ048 7 11900 46100 601 198 676 656 797 53 82
MLZ058 75 13900 53600 668 208 710 769 934 90 97
MLZ066 9 16300 62800 789 207 706 908 1104 90 100
MLZ076 10 17600 71300 864 203 693 991 1205 90 100
R407
F
MLZ015 2 4000 13700 198 202 689 206 250 36 68
MLZ019 25 5200 18800 257 203 693 266 323 36 68
MLZ021 3 5600 19800 281 198 676 282 343 36 68
MLZ026 35 6800 24600 332 205 700 349 424 36 68
MLZ030 4 8400 29000 377 222 758 420 510 53 82
MLZ038 5 9700 34800 438 221 754 494 600 53 82
MLZ045 6 11800 42300 575 206 703 602 731 53 82
MLZ048 7 12900 46100 644 201 686 656 797 53 82
MLZ058 75 15100 53600 715 211 720 769 934 90 97
MLZ066 9 17700 62800 845 21 717 908 1104 90 100
MLZ076 10 19100 71300 925 206 703 991 1205 90 100
at EN12900 conditions To= 14degF Tc= 113degF RGT= 68degF SC= 0degF R507 performance data are nearly identical to R404A performance dataMotor voltage code 4 400V3~50 Hz amp 460V3~60 HzMLZMLM042 motor voltage code 1 208-230V1~60 Hz
60 Hz
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
13FRCCPC015A722
R404A R507
Technical specifications
ModelTo -10 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50 Hz
MLZ015T490 8100 132 10400 130 13000 128 16100 125 19800 123 24000 121 28900 121
110 6300 177 8400 174 10700 169 13300 165 16300 162 19800 160 23800 159130 - - - - 8000 228 10100 221 12500 215 15300 210 18500 208
MLZ019T490 10900 160 13700 161 17000 161 20900 160 25400 159 30800 160 37000 163
110 9100 203 11600 207 14400 208 17700 207 21500 205 26000 203 31200 203130 - - - - 11400 264 14100 265 17200 263 20800 261 25100 258
MLZ021T490 11500 168 14500 169 18000 170 22200 171 27000 172 32700 173 39200 174
110 9700 215 12300 217 15300 219 18800 219 22800 218 27600 216 33200 213130 - - - - 12100 283 14900 283 18200 280 22100 276 26600 269
MLZ026T490 14000 212 17700 214 22100 215 27300 216 33500 217 40700 217 49000 217
110 11900 277 15000 278 18700 279 23100 279 28300 279 34300 279 41400 278130 - - - - 15200 363 18700 362 22900 361 27800 359 33500 357
MLZ030T490 17100 246 21600 249 26900 251 33200 252 40500 253 49000 254 58800 255
110 14300 321 18200 322 22800 323 28200 323 34500 323 41800 322 50200 322130 - - - - 18300 419 22700 417 27900 415 33900 413 40900 410
MLZ038T490 20700 284 26000 284 32200 285 39500 288 48000 292 57900 299 69200 308
110 17400 374 21900 372 27300 371 33600 371 40900 372 49500 375 59200 380130 - - - - 21600 486 26700 483 32700 481 39700 481 47800 483
MLZ042T590 22600 344 29000 353 36400 362 45100 369 55400 374 67700 374 82000 367
110 19200 448 24500 449 30700 453 38000 457 46700 460 57100 461 69500 459130 - - - - 24300 594 30100 592 37200 592 45900 592 56300 590
MLZ045T490 25100 363 31700 362 39400 361 48500 361 59200 362 71400 365 85500 369
110 20600 470 26300 470 33000 470 40900 469 50100 469 60700 469 73000 471130 - - - - 25900 618 32400 619 40000 619 48800 618 59100 618
MLZ048T490 27400 400 34700 399 43200 397 53000 395 64400 393 77400 392 92200 390
110 22400 514 28800 516 36300 517 44900 518 54800 519 66200 520 79200 520130 - - - - 28200 658 35300 664 43600 670 53100 675 64000 679
MLZ058T490 31000 442 39800 450 50000 457 61700 465 75200 472 90500 479 107900 485
110 24900 575 32800 579 41800 583 52000 589 63700 594 77000 600 92100 606130 - - - - 32600 759 41200 759 51000 761 62100 763 74700 766
MLZ066T490 35700 517 45800 518 57800 523 71800 531 88200 544 107100 562 128800 586
110 29700 670 38300 669 48500 672 60300 677 74200 687 90300 701 108800 720130 - - - - 38500 885 48100 889 59300 896 72300 907 87400 922
MLZ076T490 43600 598 55000 599 68200 606 83500 616 101600 629 122800 643 147600 657
110 37100 755 46100 757 56500 763 68900 771 83700 781 101400 790 122500 798130 - - - - 43500 963 52100 970 62800 977 76200 982 92700 984
60 Hz
MLZ015T490 9800 157 12500 157 15700 156 19400 155 23800 153 28800 150 34600 146
110 7900 201 10400 202 13100 202 16300 201 19900 200 24200 197 29000 193130 - - - - 10200 260 12800 260 15800 259 19200 256 23200 252
MLZ019T490 13400 190 16800 192 20900 192 25600 191 31100 191 37400 194 44600 201
110 11200 239 14200 246 17700 249 21700 249 26300 247 31700 246 37800 246130 - - - - 14100 311 17400 314 21200 313 25700 310 30800 307
MLZ021T490 14200 197 17900 205 22300 208 27300 207 33100 206 39700 208 47200 215
110 12000 252 15200 262 18900 264 23200 264 28100 262 33800 262 40200 266130 - - - - 15100 339 18700 338 22800 334 27500 332 32900 333
MLZ026T490 17700 245 22300 255 27700 259 34000 260 41200 260 49500 260 58900 262
110 14900 312 18800 325 23400 331 28700 332 34900 331 42000 330 50000 330130 - - - - 18700 421 23100 423 28200 421 34000 418 40700 41590 20800 289 26200 292 32500 296 39900 299 48500 300 58200 299 69100 293
MLZ030T4 110 17600 373 22100 373 27500 375 33800 377 41100 379 49400 380 58800 377130 - - - - 21900 480 27100 480 33100 481 40100 481 48000 48090 24800 353 31300 352 38900 354 47700 358 57900 359 69600 357 83100 348
MLZ038T4 110 20900 451 26600 450 33100 452 40500 455 49100 457 59100 455 70400 447130 - - - - 26500 573 32700 577 39700 579 47900 578 57200 57190 30300 417 38100 422 47300 425 58000 426 70400 426 84600 427 100700 431
MLZ045T4 110 25500 535 32200 540 40000 543 49100 544 59700 543 71800 544 85600 546130 - - - - 32000 698 39500 699 48200 698 58300 697 69800 69890 33000 454 41500 459 51600 464 63400 469 77000 471 92400 467 109800 456
MLZ048T4 110 27900 584 35100 586 43700 591 53700 596 65300 599 78500 597 93400 588130 - - - - 34900 749 43100 753 52600 756 63500 754 75800 74790 38500 549 49300 556 62100 568 77100 581 94200 594 113600 602 135300 604
MLZ058T4 110 30800 710 39900 704 50700 707 63300 716 77800 727 94200 738 112500 746130 - - - - 38000 904 47900 901 59300 905 72300 913 86900 92190 44800 626 56300 638 70000 654 86100 672 104800 690 126200 706 150600 718
MLZ066T4 110 37800 786 47600 795 59300 808 72900 823 88600 839 106600 853 127100 864130 - - - - 47700 1005 58700 1016 71300 1028 85800 1039 102300 104790 51800 710 64900 731 80400 746 98800 761 120400 781 145600 810 174800 854
MLZ076T4 110 43700 888 54800 909 67800 924 82900 936 100700 951 121500 975 145700 1011130 - - - - 53600 1156 65500 1165 79300 1176 95500 1193 114600 1222
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT= 68degF Tc Condensing temperature in degF Pe Power input in W Subooling= 0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
14 FRCCPC015A722
Technical specifications
R22
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZMLM015T490 9400 114 11800 116 14600 118 17800 120 21700 122 26100 124
110 - - 10400 146 13000 149 16000 151 19500 152 23600 153130 - - - - - - 14000 189 17100 191 20800 192
MLZMLM019T490 12500 140 15500 142 19000 144 23000 146 27900 149 33600 152
110 - - 13800 180 16900 182 20700 184 25100 186 30400 188130 - - - - - - 18000 231 21900 233 26700 235
MLZMLM021T490 13300 152 16500 155 20100 158 24500 161 29600 164 35600 166
110 - - 14600 193 18000 197 22000 200 26700 201 32300 202130 - - - - - - 19200 253 23400 255 28400 256
MLZMLM026T490 16100 185 20200 186 25000 186 30800 184 37800 183 46300 183
110 - - 18000 234 22400 235 27700 234 34100 233 41900 230130 - - - - - - 24300 299 29900 298 36800 294
MLZMLM030T490 18900 220 24100 227 30300 233 37400 240 45400 247 54300 255
110 - - 21600 281 27300 288 33800 294 41200 300 49400 306130 - - - - - - 29900 365 36600 371 44100 375
MLZMLM038T490 21700 255 28000 265 35500 275 44000 285 53500 294 64000 301
110 - - 25400 329 32200 339 39900 349 48600 356 58000 360130 - - - - - - 35300 433 43200 440 51800 44490 30400 326 33700 317 40200 316 49200 322 60300 333 73200 347
MLZMLM042T5 110 - - 29500 408 36000 405 44300 408 54000 413 64500 418130 - - - - - - 38700 537 47800 537 57000 536
MLZMLM045T490 25900 320 33400 322 42400 323 53000 323 64800 325 77800 331
110 - - 29300 399 37600 402 47200 403 58100 405 70100 409130 - - - - - - 40900 511 50900 513 61900 516
MLZMLM048T490 29600 349 37400 352 46600 352 57400 352 70000 354 84700 361
110 - - 33500 437 41900 440 51800 440 63300 441 76800 445130 - - - - - - 45300 558 55500 560 67500 562
MLZMLM058T490 34200 412 43500 414 54600 413 67800 413 83200 416 101100 427
110 - - 39000 510 49000 513 61000 513 75200 516 91900 523130 - - - - - - 52800 652 65800 653 81000 658
MLZMLM066T490 38000 457 49100 462 62500 465 78000 469 95600 477 115300 492
110 - - 44500 573 56600 578 70800 583 86900 589 104800 600130 - - - - - - 62400 732 76900 736 93100 744
MLZMLM076T490 45800 552 58100 549 72800 540 89800 533 109400 536 131800 558
110 - - 52500 675 65800 671 81300 665 99100 666 119300 681130 - - - - - - 71600 850 87600 850 105800 861
60H
z
MLZMLM015T490 11100 129 14100 133 17500 137 21400 141 26000 145 31100 150
110 - - 12500 167 15600 171 19300 175 23500 178 28200 181130 - - - - - - 17100 217 20800 220 25100 222
MLZMLM019T490 14600 166 18500 171 23000 177 28200 182 34300 184 41100 184
110 - - 16600 212 20800 218 25600 223 31100 225 37400 224130 - - - - - - 22600 276 27500 278 33200 277
MLZMLM021T490 15400 179 19600 183 24600 187 30400 191 36900 196 44200 204
110 - - 17700 227 22200 231 27500 234 33400 237 40100 242130 - - - - - - 24200 290 29600 294 35600 298
MLZMLM026T490 18900 215 24000 220 30000 226 37000 230 45100 233 54300 234
110 - - 22100 279 27600 287 33900 292 41100 294 49200 293130 - - - - - - 30100 370 36700 373 44000 371
MLZMLM030T490 22200 259 28500 266 35900 274 44500 282 54100 291 64700 300
110 - - 25800 331 32500 339 40400 347 49200 354 59000 360130 - - - - - - 35700 430 43800 437 52700 442
MLZMLM038T490 25900 301 33400 312 42300 324 52500 336 63900 346 76300 354
110 - - 30200 388 38300 400 47600 411 58000 419 69300 424130 - - - - - - 42000 510 51500 519 61900 523
MLZMLM045T490 31800 370 41000 378 51800 385 64300 393 78400 403 93900 415
110 - - 36800 471 46700 479 58200 486 71200 492 85600 499130 - - - - - - 51100 609 62900 615 76000 620
MLZMLM048T490 35900 397 45900 405 57400 414 70700 424 85700 436 102500 451
110 - - 40600 513 51400 522 63700 531 77700 538 93400 547130 - - - - - - 55800 669 68600 676 83000 680
MLZMLM058T490 40600 475 52200 489 66200 503 82400 517 100800 531 121500 545
110 - - 46900 607 59600 623 74400 635 91500 645 110800 652130 - - - - - - 65000 794 80600 802 98400 805
MLZMLM066T490 45400 533 58800 551 75100 569 93900 588 115200 605 138700 620
110 - - 53400 683 68300 703 85500 721 105000 737 126500 750130 - - - - - - 75900 893 93500 908 112800 919
MLZMLM076T490 54000 639 69500 653 88000 665 109100 678 132800 693 158700 712
110 - - 63200 807 80000 822 99200 835 120600 848 144100 863130 - - - - - - 87800 1043 107400 1055 128600 1067
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
15FRCCPC015A722
R134a
Technical specifications
ModelTo 10 20 30 40 50 55Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 7200 078 9300 078 11700 079 14600 080 18000 081 19900 082
110 - - 8200 099 10500 100 13100 101 16100 102 17800 102130 - - - - 9100 126 11400 127 14100 128 15600 129
MLZ019T490 9300 099 11900 100 15100 101 18900 102 23300 103 25700 104
110 - - 10600 126 13500 127 16800 129 20800 130 23000 130130 - - - - 11700 159 14700 162 18100 163 20100 164
MLZ021T490 9900 102 12700 104 16000 105 20000 106 24700 108 27300 109
110 - - 11300 130 14300 132 17900 133 22100 135 24400 135130 - - - - 12400 165 15600 167 19300 169 21300 170
MLZ026T490 12200 124 15700 126 19900 127 24800 129 30500 131 33700 132
110 - - 14000 158 17700 161 22100 163 27300 165 30200 166130 - - - - 15400 201 19300 204 23800 207 26400 208
MLZ030T490 14700 148 18900 150 23900 151 29800 153 36800 155 40600 157
110 - - 16800 188 21300 190 26600 192 32900 195 36400 196130 - - - - 18500 239 23200 242 28700 245 31800 246
MLZ038T490 17300 180 22300 183 28200 185 35100 187 43200 189 47800 191
110 - - 19800 229 25100 233 31300 236 38700 238 42800 239130 - - - - 21800 292 27300 297 33700 299 37300 30090 19800 220 25700 226 32300 231 39800 235 48300 242 53100 247
MLZ042T5 110 - - 22700 273 28800 279 35700 283 43600 287 48000 289130 - - - - 24800 339 31100 345 38200 348 42200 350
MLZ045T490 21500 204 27700 208 35100 210 43700 211 53500 213 58900 213
110 - - 24500 263 31200 266 39100 269 48100 272 53100 273130 - - - - 26900 336 33900 340 41900 344 46400 347
MLZ048T490 22900 221 29400 225 37100 228 46200 231 56600 232 62300 233
110 - - 26000 284 33000 288 41300 292 50800 294 56000 295130 - - - - 28600 362 35800 367 44300 370 48900 372
MLZ058T490 27500 275 35100 280 44000 288 54500 295 66800 298 73600 297
110 - - 31000 354 39100 362 48600 368 59600 368 65700 366130 - - - - 33900 450 42300 457 52000 458 57400 455
MLZ066T490 31900 313 40600 320 51100 327 63400 333 77600 337 85500 337
110 - - 36000 403 45500 411 56500 416 69300 416 76400 414130 - - - - 39400 510 49200 518 60400 519 66700 516
MLZ076T490 35500 356 45400 363 57100 372 70800 380 86500 384 95200 383
110 - - 40100 458 50700 468 63100 474 77500 475 85400 472130 - - - - 43900 581 54800 590 67600 591 74700 588
60H
z
MLZ015T490 8900 092 11500 094 14600 096 18100 098 22200 100 24400 102
110 - - 10200 117 13100 119 16400 121 20100 124 22200 125130 - - - - 11500 147 14400 150 17800 153 19600 154
MLZ019T490 11400 119 14800 122 18800 125 23400 127 28600 130 31500 132
110 - - 13200 152 16900 155 21100 157 25900 160 28500 162130 - - - - 14700 192 18600 195 22900 198 25300 199
MLZ021T490 12200 122 15800 126 19900 128 24800 130 30400 133 33500 136
110 - - 14100 157 18000 160 22400 162 27500 164 30300 166130 - - - - 15800 198 19800 202 24300 204 26800 205
MLZ026T490 15100 149 19400 152 24600 155 30700 159 37600 163 41300 166
110 - - 17300 189 22100 194 27700 198 34000 201 37400 202130 - - - - 19400 240 24400 246 30100 250 33100 251
MLZ030T490 18100 182 23400 186 29700 189 36900 192 45200 198 49800 201
110 - - 20900 231 26700 235 33300 239 40900 243 45100 245130 - - - - 23300 291 29400 296 36200 301 39900 304
MLZ038T490 21300 214 27500 218 34900 224 43500 229 53200 236 58500 239
110 - - 24500 273 31300 278 39200 284 48200 290 53100 293130 - - - - 27400 346 34500 352 42700 358 47100 361
MLZ045T490 26500 254 34100 259 43100 263 53500 268 65500 275 72100 280
110 - - 30000 325 38100 330 47700 334 58600 340 64600 343130 - - - - 32600 414 41100 419 50800 424 56200 427
MLZ048T490 28100 271 36100 276 45500 282 56400 289 68900 297 75800 302
110 - - 31800 347 40400 353 50300 359 61700 365 68000 368130 - - - - 34700 442 43500 449 53700 455 59300 457
MLZ058T490 33500 326 42800 335 53700 347 66200 359 80500 370 88300 374
110 - - 37900 420 47700 432 59200 443 72300 451 79500 453130 - - - - 41300 537 51500 550 63100 558 69600 559
MLZ066T490 38600 373 49100 384 61500 397 76000 411 92600 424 101700 430
110 - - 43500 480 54900 495 68000 508 83000 516 91200 518130 - - - - 47600 615 59200 631 72500 638 79800 638
MLZ076T490 43300 428 54900 438 68900 453 85200 470 103900 486 114100 493
110 - - 48900 551 61600 567 76300 581 93100 591 102300 594130 - - - - 53500 707 66600 723 81400 731 89400 731
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
16 FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9000 115 11600 117 14700 119 18500 120 22900 119 28200 116
110 - - 9800 148 12600 151 16000 153 20000 154 24700 154130 - - - - 10300 193 13200 196 16700 199 20900 200
MLZ019T490 11600 152 15000 155 19000 157 23900 158 29700 157 36500 153
110 - - 12700 196 16300 199 20700 202 25900 203 32000 203130 - - - - 13300 255 17100 259 21600 262 27000 264
MLZ021T490 12000 161 15500 165 19700 168 24700 170 30600 172 37500 173
110 - - 13300 211 17100 214 21600 217 26800 220 32900 222130 - - - - 14300 282 18100 285 22700 288 28100 291
MLZ026T490 15100 197 19500 202 24800 205 31100 209 38500 211 47100 212
110 - - 16800 258 21500 263 27100 266 33700 270 41400 272130 - - - - 17900 345 22800 350 28600 353 35300 356
MLZ030T490 18500 220 23700 224 30000 227 37600 228 46800 230 57500 233
110 - - 20500 286 26000 291 32600 293 40500 293 50000 293130 - - - - 22000 369 27500 374 34300 376 42300 375
MLZ038T490 21400 256 27400 261 34700 264 43600 266 54200 268 66600 271
110 - - 23800 332 30100 338 37700 340 46900 341 57900 341130 - - - - 25500 429 31900 435 39700 437 49000 43690 24600 336 31700 339 40400 340 50700 343 63000 349 77400 360
MLZ042T5 110 - - 27200 434 34800 437 43900 437 54800 438 67500 442130 - - - - 29000 569 36800 571 46100 571 57200 570
MLZ045T490 26600 337 34500 342 44000 346 55400 348 68700 346 84400 340
110 - - 28900 437 37400 439 47500 442 59400 444 73300 443130 - - - - 30400 566 39100 565 49500 565 61700 566
MLZ048T490 29200 372 37900 377 48400 381 60800 383 75500 382 92700 375
110 - - 31800 482 41100 484 52200 487 65300 489 80600 488130 - - - - 33400 625 43000 623 54400 623 67800 624
MLZ058T490 33100 413 42700 422 54100 432 67700 439 83700 440 102400 430
110 - - 36400 544 46500 551 58400 559 72500 566 89000 567130 - - - - 38400 721 48600 722 60600 727 74700 732
MLZ066T490 38700 493 49900 504 63300 515 79200 523 97900 524 119800 513
110 - - 42600 649 54400 656 68400 666 84800 674 104000 676130 - - - - 45000 860 56900 861 70900 867 87400 873
MLZ076T490 42600 557 55600 560 71200 566 89600 575 111300 588 136800 605
110 - - 46500 722 60400 724 76800 728 96100 736 118800 748130 - - - - 48900 944 63200 943 80000 946 99700 953
60H
z
MLZ015T490 10700 138 14000 139 17900 140 22500 140 28000 141 34300 144
110 - - 11900 178 15400 180 19500 181 24400 181 30000 182130 - - - - 12800 230 16400 233 20500 235 25400 236
MLZ019T490 13900 179 18200 180 23300 181 29300 181 36400 183 44700 186
110 - - 15500 230 20100 232 25400 234 31700 234 39100 235130 - - - - 16700 298 21300 302 26700 304 33100 305
MLZ021T490 15000 192 19400 196 24600 199 30800 203 38100 206 46600 209
110 - - 16700 251 21300 254 26800 258 33300 263 40900 266130 - - - - 17800 337 22600 340 28200 344 34800 349
MLZ026T490 18300 227 23600 231 30000 235 37500 239 46400 243 56800 246
110 - - 20300 296 26000 300 32700 305 40600 309 49800 314130 - - - - 21700 397 27500 401 34400 406 42400 411
MLZ030T490 22700 260 29000 265 36700 268 46200 271 57500 278 70900 291
110 - - 25200 337 31800 343 40000 346 49900 349 61800 355130 - - - - 27000 434 33800 442 42300 446 52400 450
MLZ038T490 26300 303 33500 308 42500 312 53400 315 66500 323 82100 338
110 - - 29200 392 36800 399 46300 403 57800 406 71500 413130 - - - - 31300 506 39200 515 48900 520 60700 523
MLZ045T490 32300 398 42000 405 53600 409 67400 408 83600 402 102700 388
110 - - 35400 516 45700 518 57800 519 72000 516 88700 507130 - - - - 37500 666 47900 663 60200 658 74600 651
MLZ048T490 35200 446 45800 454 58500 458 73500 457 91200 450 112000 434
110 - - 38600 578 49800 581 63000 581 78600 577 96800 568130 - - - - 40900 745 52300 743 65700 737 81300 729
MLZ058T490 41100 490 53000 496 67100 505 83800 517 103600 530 126700 545
110 - - 45300 640 57800 646 72500 655 89900 667 110200 682130 - - - - 47900 842 60500 846 75400 855 92800 867
MLZ066T490 48200 578 62100 586 78700 596 98300 610 121500 626 148600 644
110 - - 53100 757 67700 763 85000 774 105400 788 129300 805130 - - - - 56100 995 70900 1000 88400 1010 108900 1024
MLZ076T490 52000 642 67300 650 85700 660 107400 668 133100 667 163200 654
110 - - 57200 831 73300 836 92300 845 114800 854 141100 857130 - - - - 60600 1077 76900 1077 96100 1084 118600 1093
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407A
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
17FRCCPC015A722
Technical specifications
ModelTo 0 10 20 30 40 50Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe
50H
z
MLZ015T490 9500 123 12300 125 15600 126 19600 127 24400 127 30000 127
110 - - - - 13500 161 17100 162 21400 163 26500 164130 - - - - - - 14200 210 18100 212 22600 213
MLZ019T490 12400 163 15900 165 20200 166 25400 167 31500 167 38800 168
110 - - - - 17500 212 22100 214 27700 216 34300 217130 - - - - - - 18400 277 23400 279 29200 281
MLZ021T490 12800 172 16500 175 21000 177 26300 179 32500 183 39800 190
110 - - - - 18300 228 23100 230 28700 233 35200 237130 - - - - - - 19600 305 24500 307 30300 309
MLZ026T490 16100 211 20800 214 26400 216 33000 220 40900 225 50000 233
110 - - - - 23000 280 29000 282 36100 285 44300 290130 - - - - - - 24600 373 30800 376 38100 379
MLZ030T490 19700 235 25100 239 31800 241 39900 242 49500 244 60800 250
110 - - - - 27800 310 34800 312 43200 312 53300 313130 - - - - - - 29800 401 37000 402 45600 401
MLZ038T490 22800 273 29100 278 36800 280 46200 281 57300 284 70400 290
110 - - - - 32200 361 40300 363 50100 363 61700 364130 - - - - - - 34500 466 42800 468 52800 46790 26100 358 33700 361 42800 362 53700 364 66600 369 81800 377
MLZ042T5 110 - - - - 37200 467 46900 468 58400 468 72000 470130 - - - - - - 39800 613 49800 613 61600 612
MLZ045T490 28200 359 36700 364 46700 369 58600 370 72600 366 89100 353
110 - - - - 40000 470 50700 473 63400 474 78200 471130 - - - - - - 42300 607 53500 607 66600 607
MLZ048T490 31000 395 40300 401 51300 406 64400 408 79800 403 97900 389
110 - - - - 44000 518 55700 522 69600 523 85900 519130 - - - - - - 46500 669 58800 670 73100 669
MLZ058T490 35200 440 45300 449 57400 459 71700 465 88500 465 108200 455
110 - - - - 49800 588 62400 596 77300 603 94800 604130 - - - - - - 52600 775 65400 779 80500 784
MLZ066T490 41200 524 53000 535 67100 547 83800 555 103500 555 126500 543
110 - - - - 58200 701 73000 711 90500 718 110900 720130 - - - - - - 61500 924 76500 929 94200 934
MLZ076T490 45300 600 59100 603 75400 607 94800 615 117700 629 144400 651
110 - - - - 64600 773 82000 775 102500 783 126500 800130 - - - - - - 68300 1014 86300 1014 107400 1021
60H
z
MLZ015T490 11400 148 14900 148 19000 148 24000 148 29700 150 36500 155
110 - - - - 16500 192 20900 192 26100 192 32100 194130 - - - - - - 17700 249 22200 251 27400 251
MLZ019T490 14800 191 19400 192 24800 192 31200 192 38800 195 47600 201
110 - - - - 21500 248 27300 248 34000 249 41800 250130 - - - - - - 23000 323 28900 324 35700 325
MLZ021T490 16000 206 20700 208 26200 211 32700 214 40500 219 49500 225
110 - - - - 22900 272 28700 275 35700 278 43800 283130 - - - - - - 24400 364 30500 367 37600 371
MLZ026T490 19500 243 25100 245 31900 248 39900 253 49300 258 60300 265
110 - - - - 27800 320 35000 324 43400 328 53300 334130 - - - - - - 29700 429 37100 433 45700 438
MLZ030T490 24200 278 30800 282 39000 285 48900 288 60800 295 74800 308
110 - - - - 34000 366 42700 370 53300 373 65800 379130 - - - - - - 36600 475 45600 479 56500 483
MLZ038T490 28000 323 35600 328 45100 331 56600 335 70400 343 86600 359
110 - - - - 39400 426 49500 430 61700 434 76200 441130 - - - - - - 42300 552 52800 557 65400 562
MLZ045T490 34400 425 44600 430 56900 433 71400 432 88400 427 108400 416
110 - - - - 48800 554 61700 553 76800 549 94600 540130 - - - - - - 51800 711 65000 705 80400 696
MLZ048T490 37500 476 48700 482 62000 485 77800 484 96400 478 118200 466
110 - - - - 53300 620 67300 619 83800 615 103100 605130 - - - - - - 56500 796 70900 790 87700 779
MLZ058T490 43800 522 56200 527 71100 536 88800 548 109500 563 133800 582
110 - - - - 61800 690 77400 698 95900 711 117400 727130 - - - - - - 65400 908 81300 916 100000 928
MLZ066T490 51300 617 66000 623 83400 633 104100 647 128400 665 156900 688
110 - - - - 72500 815 90800 825 112400 840 137700 859130 - - - - - - 76700 1073 95400 1082 117300 1097
MLZ076T490 55300 684 71500 691 90800 699 113700 706 140600 708 172100 701
110 - - - - 78400 892 98600 900 122300 908 150100 913130 - - - - - - 83100 1155 103700 1160 127600 1168
Legend To Evaporating temperature in degF Qo Cooling capacity in Btuh RGT = 68degF Tc Condensing temperature in degF Pe Power input in W Subcooling =0degFCapacity data at other conditions are available in the datasheets at wwwdanfosscomodsg
R407F
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
18 FRCCPC015A722
MLZMLM015-019-021-026
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
940
7504 x Oslash 075
432940
750
73deg45deg31deg34deg
438
506
645
Suction port 34rdquo ODF
Dischargeport12rdquoODF
290
1419
767
215
074
309
043
909
1548
Schrader valveand cap
Oil sight glass
All dimensions in Inch
940
4 x Oslash 075
Oslash645
Discharge line Oslash100rdquo-14UN(2A) Suction line
Oslash125rdquo-12UN(2A)
Oil sight glass
Schrader valveand cap
510
434
290
14191548
909
043
074
308218
767
45degplusmn2deg 73deg31deg34deg
750
750
940
439suction line
All dimensions in inch
RotolockBrazed
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
19FRCCPC015A722
MLZMLM030-038-045-048
Mounting grommetTerminal box
P amp T terminal box type
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
Dimensions
RotolockBrazed
370
1585
79
Discharge port1) 12 ODF2) 34 ODF
1716
1027
074043
336222
Schrader valveand cap
Suction port 78 ODF
Oslash7187-7265
Oil sight glass
941748
526
1) 4762) 480
34deg 31deg45deg 73deg
748941
466
4 x Oslash 075
1) MLZMLM 030-038-042-0452) MLZMLM 048
All dimensions in Inch
941
477suction
line
375
526
473
36-37
1585
79
1027Oil sightglass
Schrader
1716
074043
34deg 31deg
45degplusmn2deg
941
748
748
4 x Oslash 075
Oslash7187-7265
Suction lineOslash125-12UN (2A)
Discharge line1) Oslash1 - 14UN(2A)2) Oslash125 - 12UN (2A)
1) MLZ030-038-042-0452) MLZ048
All dimensions in inch
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
20 FRCCPC015A722
Dimensions
MLZMLM058-066-076
913
7491 - 7509
524
484
7211 - 7288
Dischargeport 78rdquo ODF
1128
Schrader valve and cap
Oil sight glass
Suction port 1rdquo18 ODF
191
074027
028
1379
1) 20342) 2072
363 - 370
1) 19292) 1966
1) MLZM0582) MLZM066-076
All dimensions in Inch
34deg 31deg45deg
73deg
7491-7509913
4 x Oslash 075 - 078
493
C amp Q terminal box type
CT1
ST2
RT3
006
161
Oslash 161
116
516rdquo - 18 UNCself tapping
Recommended torque for mounting bolts100 lbfin (plusmn10 lbfin)
Oslash 043
232
2321249
suction line
133
31deg73deg
45degplusmn2deg
11927
4xOslash19
Oslash185
94
286 350
134
7
48
19
1) 4902) 499
1) 5172) 526
Suction lineOslash1rdquo34 - 12UN(2A)
Oil sight glass
Schrader valve and cap
Discharge lineOslash1rdquo14 - 12UN(2A)
190
190
1) MLZM0582) MLZM066-076
All dimensions in mm
Mounting grommet
Refer to section ldquoOrdering information and packagingrdquo for overview of shipped mounting accessories
Terminal box C amp Q (screw terminals)
RotolockBrazed
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
21FRCCPC015A722
Dimensions
Compressor models Brazed connection sizeRotolock adaptor set
(adaptor gasket sleeve nut)Rotolock adaptor( adaptor only)
Rotolock Solder sleeve ODF Code Number Code Number
MLZMLM 015-019-021-026Suction 34 1-14 34
120Z0126120Z0366
Discharge 12 1 12 120Z0365
MLZMLM 030-038-042-045Suction 78 1-14 78
120Z0127120Z0367
Discharge 12 1 12 120Z0365
MLZMLM 048Suction 78 1-14 78
120Z0128120Z0367
Discharge 34 1-14 34 120Z0366
MLZMLM 058-066-076Suction 1-18 1-34 1-18
120Z0129120Z0364
Discharge 78 1-14 78 120Z0367
Tightening torque for rotolock connection 664lbft plusmn1475
Oil sight glass
Schrader valveand cap
MLZ MLM scroll compressors are factory delivered with brazed connections only
Dedicated rotolock adaptors and adaptor sets are available as accessory
Oil sight glass
Suction and discharge connections
MLZ MLM scroll compressors come equipped with a threaded oil sight glass with 1rdquo18 - 18 UNEF connection It can be used for a visual check of the oil amount and condition or it may be replaced by an accessory oil management device The oil level must be visible in the sight glass during operationTorque requirement= 387 plusmn18 lbft
The oil fill and drain connection and gauge port is a 14 male flare connector incorporating a schrader valveTorque requirementsSchrader valve core 044 plusmn014 lbftSchrader valve cover 107 plusmn7 lbft
Schrader
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
22 FRCCPC015A722
Electrical data connections and wiring
MLZMLM scroll compressors are available in 3 different motor voltages
MLZMLM scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top) Since single-phase motors will start and run in only one direction reverse rotation is not a major consideration Three-phase motors however will start and run in either direction depending on the phase angles of the supplied power Care must be taken during installation to ensure that the compressor operates in the correct direction
(see ldquoPhase sequence and reverse rotation protectionrdquo page 26)
The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single-phase applications the terminals are labelled C (common) S (start) and R (run)
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure
that the two outside tabs of the cover engage the terminal box
The terminal cover and gasket should be installed prior to operation of the compressor Respect the ldquouprdquo marking on gasket and cover and ensure that the two outside tabs of the cover engage the terminal box
The compressor terminal box IP rating according to CEI 529 is IP22 for all modelsbull First numeral level of protection against contact and foreign objects
2 protection against object size over 12 inch (fingers of similar)bull Second numeral level of protection against water
2 protection against dripping water when tilted up to 15deg
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
C amp Q terminal box type
CT1
ST2
RT3
P amp T terminal box type
push
push
push
Motor voltage code 1
Motor voltage code 2
Motor voltage code 4
Motor voltage code 5
Motor voltage code 7
Motor voltage code 9
Nominal voltage 50 Hz - 200-220 V - 3 ph 380-400 V - 3 ph 220-240 V - 1 ph - -
Voltage range 50 Hz - 180 - 242 V 340 - 460 V 198 - 264 V - -
Nominal voltage 60 Hz 208-230 V - 1 ph 208-230 V - 3 ph 460 V - 3 ph - 575 V - 3 ph 380 V - 3 ph
Voltage range 60 Hz 187 - 253 V 187 - 253 V 414 - 506 V - 517 - 632 V 342 - 418 V
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
23FRCCPC015A722
Electrical data connections and wiring
Three phase electrical characteristics
Single phase electrical characteristics
Compressor model LRA MCC Max Oper A Winding resistance (Ohm)
A A A T1-T3 T1-T2 T2-T3
Mot
or v
olta
ge c
ode
2
200-
220
V
3 ph
50
Hz
208-
230
V
3 ph
60
Hz
MLZMLM015T2 60 145 99 123 167 167MLZMLM019T2 95 175 133 087 118 118MLZMLM021T2 95 175 136 087 118 118MLZMLM026T2 95 220 166 087 118 118MLZMLM030T2 120 260 197 067 067 068MLZMLM038T2 123 260 235 060 060 061MLZMLM045T2 170 300 282 048 046 048MLZMLM048T2 190 370 306 043 044 043MLZMLM058T2 190 400 361 037 037 037MLZMLM066T2 235 460 407 032 032 033MLZMLM076T2 235 500 476 032 032 033
Mot
or v
olta
ge c
ode
4
380-
400
V
3ph
50
Hz
46
0 V
3
ph
60 H
zMLZMLM015T4 30 70 49 50 67 67MLZMLM019T4 45 95 67 34 47 47MLZMLM021T4 45 95 68 34 47 47MLZMLM026T4 45 110 83 34 47 47MLZMLM030T4 60 130 98 26 26 26MLZMLM038T4 70 150 117 23 23 24MLZMLM045T4 82 150 141 19 19 18MLZMLM048T4 87 160 153 17 17 17MLZMLM058T4 95 200 181 14 14 14MLZMLM066T4 110 240 203 13 13 13MLZMLM076T4 140 250 239 11 11 11
Mot
or v
olta
ge co
de 7
500
V
3ph
50
Hz
57
5 V
3p
h 6
0 H
z
MLZMLM015T7 26 55 40 78 106 106MLZMLM019T7 38 70 54 54 73 73MLZMLM021T7 38 80 55 54 73 73MLZMLM026T7 38 90 60 54 73 73MLZMLM030T7 42 90 78 44 45 44MLZMLM038T7 53 115 94 40 39 40MLZMLM045T7 64 115 113 28 29 29MLZMLM048T7 67 14 123 26 26 25MLZMLM058T7 75 16 144 23 23 23MLZMLM066T7 95 17 163 20 20 20MLZMLM076T7 100 20 191 17 17 17
Mot
or v
olta
ge c
ode
9
380
V
3ph
60
Hz
MLZMLM015T9 40 75 60 32 44 44MLZMLM019T9 52 115 81 22 30 30MLZMLM021T9 52 12 83 22 30 30MLZMLM026T9 52 125 101 22 30 30MLZMLM030T9 81 14 118 15 15 15MLZMLM038T9 81 17 142 15 15 15MLZMLM045T9 96 20 170 13 13 13MLZMLM048T9 110 19 185 11 11 11MLZMLM058T9 135 25 219 091 093 093MLZMLM066T9 135 28 246 088 089 087MLZMLM076T9 135 28 289 088 089 087
Compressor modelLRA MCC MaxOperA Winding resistance (Ω)
A A A Run Start
Motor code 5 220-240 V 1 ph 50 Hz
MLZMLM015T5 60 190 138 102 160MLZMLM019T5 97 230 183 069 151MLZMLM021T5 97 250 195 069 151MLZMLM026T5 97 260 242 069 151MLZMLM030T5 127 320 289 042 131MLZMLM038T5 130 380 339 039 102MLZMLM042T5 130 400 371 039 102
Motor code 1208-230 V 1 ph 60 Hz
MLZMLM015T1 69 190 138 084 170MLZMLM019T1 97 250 199 067 157MLZMLM021T1 97 245 214 067 157MLZMLM026T1 115 315 268 055 147MLZMLM030T1 150 380 319 034 090MLZMLM038T1 160 450 372 028 176MLZMLM042T1 189 600 466 023 069
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
24 FRCCPC015A722
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage LRA is printed on the nameplate
The LRA value can be used as a rough estimation for the starting current However in most cases the real starting current will be lower Many countries have defined limits for the starting current in domestic use A soft starter can be applied to reduce starting current
The MCC is the current at which the internal motor protection trips under maximum load and low voltage conditions
This MCC value is the maximum at which the compressor can be operated in transient conditions and out of the application envelope Above this value the overload will switch off to protect the motor
The Max Oper A is the current when the compressor operates at maximum load conditions and 10 below nominal voltage
This value which is the max rated load current for the compressor is new on the nameplate
Max Oper A can be used to select cables and contactors
In normal operation the compressor current consumption is always less than the Max Oper A value
LRA (Locked Rotor Amp)
MCC (Maximum Continuous Current)
Max Oper A (Maximum Operating Amp)
Electrical data connections and wiring
MLZ MLM single phase scroll compressors are designed to operate without any assistance If
starting within the defined voltage range PSC wiring is sufficient
PSC wiring with a run capacitor only is the default wiring solution for single phase MLZ and MLM compressors
The start winding (C-S) of the motor remains in circuit through a permanent (run) capacitor This permanent (run) capacitor is connected between the start winding (S) and the run winding (R)
Electrical connections
PSC wiring N L1
Run capacitor
ThermostatC
S R
IOL
Winding resistance Winding resistance is the resistance between indicated terminal pins at 25degC (resistance value +- 7)Winding resistance is generally low and it requires adapted tools for precise measurement Use a digital ohm-meter a lsquo4 wiresrsquo method and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25degC the measured resistance must be corrected with following formula
a + tambRtamb = R25degC a + t25degC
t25degC reference temperature = 25degC
tamb temperature during measurement (degC)
R25degC winding resistance at 25degC
Ramb winding resistance at tamb
coefficient a= 2345
If the starting torque of the PSC wiring is not sufficient due to pressures not fully equalized during the off-cycle or some voltage drop during starting the PTCSCR wiring might be an option PTCSRC wiring provides more motor torque than PSC wiring but less than CSR wiring The PTC is wired in parallel to the run capacitor
When starting the compressor the PTC which is at low resistance provides additional starting current to the motorrsquos start winding The current passing through the PTC causes it to heat up and at a certain temperature change to a very high resistance At this time the motor is up to nominal speed and the run capacitor determines the current through the start winding The PTC
PTCSCR wiring
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
25FRCCPC015A722
remains at high temperature and thus at high resistance as long as power is connected to the compressor When the compressor is switched off the PTC cools down to its initial low resistance and becomes available to support the next compressor startIt is important to provide sufficient time between motor starts to allow the PTC to cool down close to ambient temperature Depending on the ambient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked-rotor state depending on the ambient and systemrsquos conditions A locked-rotor state causes the
internal protector to open and would cause even further delay until the overload is reset
The following PTC types are recommended for the MLZMLM single phase compressors
N L1
Run capacitor
PTC
ThermostatC
S R
IOL
CSR wiring provides additional motor torque at start-up by the use of a start capacitor in combination with the run capacitor The start capacitor is only connected during the starting operation a potential relay is used to disconnect it after the start sequence
Some applications with high differential pressure and start duty as soft serve ice cream machine can require CSR wiring This configuration can also be used to reduce erratic starting
at unfavourable conditions such as very low ambient temperature or weak voltage
CSR wiring
N L1
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
S RRun capacitor
Nominal capacitor value and relays
Electrical data connections and wiring
Model Voltage code 1208-230 V1~60 Hz
Voltage code 5220-240 V1~50 Hz
MLZMLM015 305C12 305C9 305C11MLZMLM019 305C9 305C11 305C9 305C11MLZMLM021 305C9 305C11 305C9 305C11MLZMLM026 305C12 305C9 305C11MLZMLM030 305C9 305C11 305C9 305C11MLZMLM038 305C9 305C11 305C9 305C11MLZMLM042 305C9 305C11 305C9 305C11
Note MLZ compressors with PTCSCR are not approved by UL It is the customersrsquo responsibility to get final approval for the system when required
Compressor models
Default solution PSC wiring with run capacitor only
Additionnal components for CSR wiring
PSC wiring CSR wiringRun capacitor Start capacitor Relay
microF Volt microF Volt Reference
220-240 V 150 HzMotor voltage code 5
MLZMLM015 40 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA 2B3D
MLZMLM030 50 440 161-193 250 3ARR3J24AP4 RVA3EKL
MLZMLM038-042 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
For information
208-230 V 1 60 HzMotor voltage code 1
not provided with the compressor
MLZMLM015 45 370 145-175 330 RVA2AC3D -
MLZMLM019-021 45 370 145-175 250 RVA2AC3D -
MLZMLM026 60 370 88-108 330 RVA2AB3D -
MLZMLM030 70 370 161-193 250 RVA2AB3D -
MLZMLM038 55 440 88-108 250 RVA4AG3D -
MLZMLM042 80 370 189-227 330 RVA2AB3D -
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
26 FRCCPC015A722
Electrical data connections and wiring
Three phase
Suggested wiring diagram with one shot pump down cycle and safety lock-out relay
Control device THOptional short cycle timer (3 min) 180 sControl relay KALiquid Line Solenoid valve LLSVCompressor contactor KMPhase monitor PMSafety lock out relay KSPump-down control low pressure switch LPHigh pressure safety switchHPsFused disconnect Q1Fuses F1Compressor motor MDischarge gas thermostat DGT
MDGT
HPs180 s
THLP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
The compressor will only operate properly in a single direction Use a phase meter to establish the phase orders and connect line phases L1 L2 and L3 to terminals T1 T2 and T3 respectively For three-phase compressors the motor will run equally well in both directions Reverse rotation results in excessive noise no pressure differential between suction and discharge and suction line warming rather than immediate cooling A service technician should be present at initial start-up to verify that supply power is properly phased and that compressor and auxiliaries are rotating in the correct direction
MLZMLM015-038 scroll compressors are designed to operate for a maximum of 150 hours in reverse but as a reverse rotation situation can go unnoticed for longer periods phase monitors are recommended
For compressors MLZMLM048 and larger phase monitors are required The selected phase monitor should lock out the compressor from operation in reverse
At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely afterwards
For three-phase applications the voltage measured at the compressor terminals for each
phase should be within plusmn 2 of the average for all phases
Phase sequence and reverse rotation protection
Voltage imbalance
Internal motor protection MLZMLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containing a snap action bimetal switch
Internal protectors respond to over-current and overheating They are designed to interrupt
motor current under a variety of fault conditions such as failure to start running overload and fan failure
If the internal overload protector trips out it must cool down to about 140degF to reset Depending on ambient temperature this may take up to several hours
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
27FRCCPC015A722
Approvals and certifications
MLZ scroll compressors comply with the following approvals and certificates
Certificates are listed on the product datasheets httpwwwdanfosscomodsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038 (European Directive) All MLZ models
UL (Underwriters Laboratories)
Models with motor code 1 2 amp 4 except when using PTCSCR system
Other approvals certificates Contact Danfoss
Products Internal free volume at LP side without oil (in3)
MLZMLM 015-026 113
MLZMLM 030-048 113
MLZMLM 058-076 375
Products MLZ MLM 015 to 076Refrigerating fluids Group 2Category PED IEvaluation module no scopeService temperature - Ts -31degF lt Ts lt 131degFMLZ - Service pressure - Ps 369 PSIMLM - Service pressure - Ps 3008 PSIDeclaration of conformity contact DanfossMarking of conformity CE
Pressure equipment directive 9723EC Machinery directive 9835EC annex II b
Low voltage directive 2006 95 EC Electromagnetic compatibility 2004108CE
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
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Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
28 FRCCPC015A722
Operating conditions
General information
Refrigerant and lubricants
The scroll compressor application range is influenced by several parameters which need to be monitored for a safe and reliable operationThese parameters and the main recommendations for good practice and safety devices are explained hereunder
bull Refrigerant and lubricantsbull Motor supplybull Compressor ambient temperaturebull Application envelope (evaporating
temperature condensing temperature return gas temperature)
When choosing a refrigerant different aspects must be taken into considerationbull Legislation (now and in the future)bull Safetybull Application envelope in relation to expected
running conditionsbull Compressor capacity and efficiency
bull Compressor manufacturer recommendations amp guidelines
Additional points could influence the final choicebull Environmental considerationsbull Standardisation of refrigerants and lubricantsbull Refrigerant costbull Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use today It has a low ODP (Ozone Depletion Potential) and therefore it will be phased out in the future Check local legislation
When R22 is applied in refrigeration applications it can lead to high discharge temperature Carefully check all other parameters that can influence the discharge temperature
R404A
R507
R407A amp R407F
R404A is an HFC refrigerant R404A has zero ozone depletion potential (ODP = 0) R404A is especially suitable for low evaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very
small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near-azeotropic mixture
R507 is an HFC refrigerant with properties comparable to R404A R507 has no ozone depletion potential (ODP = 0) As with R404A R507 is particularly suitable for low evaporating
temperature applications but it can also be used for medium evaporating temperature applications R507 is an azeotropic mixture with no temperature glide
R407A and R407F are two HFC refrigerants with similar properties Both have a GWP below2200 and comply with the EU F-gas regulation They
can be used as alternatives to R404A and R507 refrigerants in MBP applications
Refrigerant R134a is an HFC refrigerant R134a has zero ozone depletion potential (ODP = 0) and is commonly accepted as the best R12 alternative R134a is a pure refrigerant and
has zero temperature glide For applications with high evaporating and high condensing temperatures R134a is the ideal choice
R134a
Designation Composition ODP GWP Safetygroup
Boilingtemp degF
Tempglide degF
Criticaltemp degF
Criticalpressure
(psi)
Cond temp 380 psia
R404A 52 R143a - 44 R125 - 4 R134a
0 3900 A1 -5260 14 1609 5410 1324
R507 50 R143a - 50 R125 0 4000 A1 -521 0 1598 5388 1303
R407A 40 R134a - 40 R125 - 20 R32 0 2107 A1 -492 116 1796 6548 1382
R407F 40 R134a - 30 R125 - 30 R32 0 1824 A1 -508 115 1814 6889 1344
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
29FRCCPC015A722
Operating conditions
Alkylbenzene oil
PVE Polyvinyl ether (PVE) is an innovative refrigeration lubricant for HFC refrigerant systems PVE is as hygroscopic as existing polyolester lubricants (POE) but PVE doesnrsquot chemically react with water no acids are formed and compressor evacuation is easier As PVE can be mixed with POE oil top up can be done with up to 25 POE
The compressor technology applied in MLZ compressors in combination with PVE lubricant provides the best possible result in terms of reliability and compressor lifetime The PVE lubricant is compatible with R22 which makes the MLZ compressors a very versatile multi- refrigerant solution Very high care has to be taken for vacuum as PVE is much more hygroscopic than alkylbenzene or mineral oil
Alkylbenzene oil can be applied in systems using HCFC refrigerants (R22) Compared to a mineral oil it provides distinct advantages excellent miscibility excellent thermal stability compatibility with mineral oils and constant quality
MLM series compressors are charged with Alkylbenzene oil and herewith offer an economically interesting alternative to the MLZ series in regions where R22 is still the predominant refrigerant Note however that MLM compressors can not be used with HFC refrigerants
Phase shift
Temperature glide
Zeotropic refrigerant mixtures
R407A R407F are zeotropic mixture (like R407C) The composition of vapour and liquid changes
during the phase transition The composition change causes phase shift and temperature glide
In system components where both vapour and liquid phases are present (evaporator condenser liquid receiver) the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants
Therefore zeotropic refrigerants need some special attention Zeotropic refrigerants must always be charged in liquid phase Flooded evaporators should not be applied in systems with zeotropic refrigerants
During the evaporating and the condensing process at constant pressure the refrigerant temperature will decrease in the condenser and rise in the evaporator Therefore when speaking about evaporating and condensing temperatures it is important to indicate whether this is a dew point temperature or a mid point value In the figure below the dotted lines are lines of constant temperature
They do not correspond to the lines of constant pressure
Points A and B are dew point values These are temperatures on the saturated vapour line
Points C and D are mid point values These are temperatures which correspond more or less with the average temperature during the evaporating and condensing process
For the same R407AF cycle mid point temperatures are typically about 2degC lower than dew point temperatures According to EN12900 recommendations Danfoss Commercial Compressors use dew point temperatures for selection tables and application envelopes etc
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
30 FRCCPC015A722
Operating conditions
Motor supply MLZ MLM scroll compressors can be operated at nominal voltages as indicated on page 22 Under-voltage and over-voltage operation is allowed within the indicated voltage ranges In case of
risk of under-voltage operation special attention must be paid to current draw and start assist for single-phase compressors may be required
The operating envelopes for MLZMLM scroll compressors are given in the figures below where the condensing and evaporating temperatures represent the range for steady-state operation Under transient conditions such as start-up and defrost the compressor may operate outside this envelope for short periods
The figures below show the operating envelopes for MLZ compressors with refrigerants R404A507 R134a and R22 The operating limits serve to define the envelope within
which reliable operations of the compressor are guaranteed
bull Maximum discharge gas temperature 275degF
bull A suction superheat below 10degF is not recommended due to the risk of liquid flood back
bull Minimum and maximum evaporating and condensing temperatures as per the operating envelopes
MLZ MLM compressors can be applied from -31degF to 122degF ambient temperature The compressors are designed as 100 suction gas
cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance
In case of enclosed fitting and high ambient temperature itrsquos recommend to check the temperature of power wires and conformity to their insulation specification
In case of safe tripping by the internal compressor overload protection the compressor must cool down to about 140degF before the overload will reset A high ambient temperature can strongly delay this cool-down process
Although the compressor itself can withstand low ambient temperature the system may require specific design features to ensure safe
and reliable operation See section lsquoSpecific application recommendationsrsquo
Application envelope
Compressor ambient temperature
High ambient temperature
Low ambient temperature
MLZ - R404A R507
RGT 65degF
Maxsuperheat 18˚F
Cond
ensi
ng te
mpe
ratu
re (deg
F)
Evaporating temperature (degF)
40
60
80
100
120
140
160
-30 -20 -10 0 10 20 30 40 50 60
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
31FRCCPC015A722
Operating conditions
MLZ - R134a
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
0 10 20 30 40 50 60 70
60
70
80
90
100
110
120
130
140
150
160
170
SH 20degF
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM R22
50
60
70
80
90
100
110
120
130
140
150
160
SH 20degF
RGT 77degF
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
32 FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407A
50
40
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degF
RGT 68degF
MLZ076 - R407A
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
33FRCCPC015A722
Operating conditions
SH18degF
RGT 68degF
MLZ015~066 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
SH18degFRGT 68degF
MLZ076 - R407F
40
50
60
70
80
90
100
110
120
130
140
150
160
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
34 FRCCPC015A722
Operating conditions
Discharge gas temperature protection (DGT)
DGT protection is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specific application envelope Please refer to the examples below which illustrate where DGT protection is required (ndeg1) and where it is not (ndeg2)
The compressor must not be allowed to cycle on the discharge gas thermostat Continuous operations beyond the compressorrsquos operating range will cause serious damage to the compressor
A DGT accessory is available from Danfoss refer to page 51
The discharge temperature depends mainly on the combination of evaporating temperature condensing temperature and suction gas superheat Discharge gas temperature should be controlled with an isolated thermocouple
or thermostat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275degF when the compressor is running within the approved operating envelope
Maximum discharge gas temperature
Example 1 (R22 SH = 20degF) LP switch setting LP1 = 29 PSI (5degF) HP switch setting HP1 = 345 PSI (142degF) The LP and HP switches dont protect suffi-ciently from operation outside the envelope A DGT protection is required to avoid operation in the hatched area
Example 2 (R22 SH = 20degF) LP switch setting LP2 = 36 PSI (14degF) HP switch setting HP2 = 247 PSI (120degF) The LP and HP switches protect from opera-tion outside the envelope No DGT protection required
-30 -20 -10 0 10 20 30 40 50 60
Evaporating temperature (degF)
Con
dens
ing
tem
pera
ture
(degF)
MLZ MLM
R22 - SH 20degF
50
60
70
80
90
100
110
120
130
140
150
160
Example 1
Example 2
LP1 LP2
HP1
HP2
Discharge line
Insulation
Bracket
Thermostat
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
35FRCCPC015A722
Operating conditions
A low pressure (LP) safety switch is recommended MLZMLM scroll compressors exhibit high volumetric efficiency and may draw very low vacuum levels which could induce scroll instability and electrical arcing at the internal cluster The minimum low-pressure safety switch setting is given in the above table For systems
without pump-down the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit The LP switch tolerance must not allow for vacuum operations of the compressor LP switch settings for pump-down cycles with automatic reset are also listed in the table above
Low pressure
Onoff cycling (cycle rate limit)
Depending on the application a number higher than 12 starts per hour can reduce the service life of the motor-compressor unit A one-minute time out is recommended
The system must be designed in a way that provides a minimum compressor running time
of 2 minutes so as to provide for sufficient motor cooling after start-up along with proper oil return Note that the oil return may vary since it depends upon system design
Danfoss recommends a restart delay timer to limit compressor cycling
MLZMLM 015-048 scroll compressors are equip-ped with an internal pressure relief valve (IPRV) for protection against blocked condenser and fan failure conditions (IPRV setting 464 PSI plusmn 58 differential pressure HP LP) Still a high pressure (HP) safety switch is recommended
MLZMLM058-068-076 scroll compressors are not equipped with an internal pressure relief valve therefore a high pressure switch is required to shut down the compressor should the discharge
pressure exceed the values shown in the table above
The high-pressure switch can be set to lower values depending on the application and ambient conditions The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the high-pressure limit If a discharge valve is used the HP switch must be connected to the service valve gauge port which must not be isolated
High pressure
High and low pressure protection
R22 R404A R134a R407A R407F
Working pressure range high side PSI 102 - 405 104 - 395 712 - 321 87 - 371 913- 347
Working pressure range low side PSI 103-928 151 - 104 93 - 58 13 - 87 16 - 913
Maximum high pressure safety switch setting PSI 432 431 342 389 364
Minimum low pressure safety switch setting PSI 74 116 65 101 13
Recommended pump-down switch settings 73 PSI below nominal evaporating pressure
Minimum low pressure pump-down switch setting PSI 136 190 123 13 16
Maximum testing pressure PSI 450
LP safety switch shall never have time delay
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
36 FRCCPC015A722
System design recommendations
Essential piping design considerations
Proper piping practices should be employed to ensure adequate oil return even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during off-cycles
If the evaporator lies above the compressor the addition of a pump-down cycle is strongly recommended If a pump-down cycle were to be omitted the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during off-cycles
If the evaporator were situated below the compressor the suction riser must be trapped to ensure the oil return to the compressor (see fig1)
When the condenser is mounted at a higher position than the compressor a suitably sized laquoUraquo-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the
compressor during off cycle The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped (see fig 2) The maximum elevation difference between the indoor and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability
Piping should be designed with adequate three-dimensional flexibility (figure 2) It should not be in contact with the surrounding structure unless a proper tubing mount has been installed This protection proves necessary to avoid excess vibration which can ultimately result in connection or tube failure due to fatigue or wear from abrasion Aside from tubing and connection damage excess vibration may be transmitted to the surrounding structure and generate an unacceptable sound level within that structure as well (for more information on sound and vibration see the section on laquoSound and vibration managementraquo page 42)
General Successful application of scroll compressors is dependent on careful selection of the compressor for the application If the compressor is not correct for the system it will operate
beyond the limits given in this manual Poor performance reduced reliability or both may result
05 slope13 fts or more
05 slope13 fts or more
U-trap
U-trap as short as possible
U-trap as short as possible
max 13 ft
g1
max 13 ft
26 to 40 fts
To condenser
Evaporator
Condenser
HP
U-trap
3D exibility
Upper loop
LP
g 2
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
37FRCCPC015A722
System design recommendations
Refrigerant charge limit MLZMLM scroll compressors can tolerate liquid refrigerant up to a certain extend without major problems However excessive liquid refrigerant in the compressor is always unfavourable for service life Besides the installation cooling capacity may be reduced because of the evaporation taking place in the compressor andor the suction line instead of the evaporator System design must be such that the amount of liquid refrigerant in the compressor is limited In this respect follow the guidelines given in the section ldquoessential piping design recommendationsrdquo in priority
Use the tables below to quickly evaluate the required compressor protection in relation with the system charge and the application More detailed information can be found in the paragraphs hereafter Please contact Danfoss for any deviation from these guidelines
Model Refrigerant charge limit (lb)
MLZ015-026 8MLZ030-048 12MLZ058-076 16
Off-cycle migration Off-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation when the system uses a bleed-type expansion device or if liquid could migrate from the evaporator into the compressor sump by gravity If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a flooded start when the compressor starts the refrigerant evaporates abruptly
under the sudden decrease of the bottom shell pressure causing the oil to foam In extreme situations this might result in too much oil leaving the compressor which must be avoided as it causes irreversible damages due to possible lack of lubrication MLZMLM scroll compressors can tolerate occasional flooded starts as long as the system has been evaluated
Depending on test results crankcase heaters Liquid Line Solenoid Valve pump down or suction accumulator must be applied see below
A suitable test to evaluate the risk of off-cycle migration is the followingbull Stabilize the non running system at 5degC
ambient temperaturebull Raise the ambient temperature to 20degC and
keep it for 10 minutesbull Start the compressor and monitor sump
temperature sight glass indication and sound level
The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in the oil sump indicates a flooded startA noisy start oil loss from the sump and sump cool down are indications for migration Depending on the amount of migration graduate measures shall be takenbull Crankcase heaterbull Liquid line solenoid valvebull Pump down cycle
Crankcase heater when the compressor is idle the oil temperature in the sump must be maintained at no lower than 20degF above the saturation temperature of the refrigerant on the low-pressure side This requirement ensures that the liquid refrigerant is not accumulating in the sump A crankcase heater is only effective if capable of sustaining this level of temperature
difference Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind) Below 25degF ambient temperature and a wind speed of above 16fts its recommended to thermally insulated the heaters in order to limit the surrounding energy losses
Note for special conditions such as low ambient temperature low load operation or brazed plate heat exchangers please refer to corresponding sections
Recommended Required No test or additional safeties requiredREQREC
BELOW charge limit ABOVE charge limit
Packaged units No test or additional safeties requiredOff cycle migration test
Liquid flood back test
System with remote heat exchanger Off cycle migration testOff cycle migration test Liquid flood back testREC REQ
REQREQ
REQ
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
38 FRCCPC015A722
System design recommendations
Due to the Danfoss scroll compressors inherent ability to handle liquid refrigerant crankcase heaters are not required when the system charge does not exceed the recommended maximum charge
Since the total system charge may be undefined a crankcase heater is recommended on all systems with remote heat exchangers In addition any system containing a refrigerant charge in excess of the maximum recommended system charge for compressors requires a crankcase heater
Belt-type crankcase heater accessories are available from Danfoss (see page 51)The heater must be energized whenever the compressor is off
Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg Seasonal shutdown)
It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor
Pump-down cycle Once the system has reached its set point and is about to shut off the LLSV on the liquid line closes The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch This step reduces the amount of charge on the low side in order to prevent off-cycle migration
A pump-down cycle represents one of the most effective ways to protect against the off-cycle migration of refrigerant however it is only convenient to apply on application with thermostatic control
Rack application with pressostatic control can use timer delay to empty the evaporators before the stop Time should be carefully set to not interfere with the low safety pressure switch
For low pressure pump-down switch settings refer to page 35
Models MLZMLM015-048 incorporate an internal low leak check valve that is appropriate for pump-down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained
Models MLZMLM058-076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refrigerant back flow the compressor might restart during pump-down applications Repeated short cycling can result in a compressor breakdown It is recommended to install an external magnetic check valve (such as Danfoss Part No 120Z5046) close to the compressorrsquos discharge connector so the discharge volume is minimized
A magnetic check valve is recommended for this as it offers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the MLZMLM compressors If a Danfoss NRV check valve is applied it has to be carefully selected for the specific operation conditions of the individual system
Liquid line solenoid valve (LLSV) This feature is very convenient and can be used on all types of applications
An LLSV is used to isolate the liquid charge in the high pressure side thereby preventing against
charge transfer or excessive migration to the compressor during off-cycles The quantity of refrigerant remaining in the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV
Optimum location area
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
39FRCCPC015A722
Suction accumulator a suction accumulator offers protection against refrigerant flood back at start-up during operations or defrosting by trapping the liquid refrigerant upstream from the compressor The suction accumulator also protects against off-cycle migration by providing additional internal free volume to the low side of the system
A suction accumulator must be carefully dimensioned taking into account the refrigerant charge as well as the gas velocity in the suction line Depending on the operating conditions it may happen that the recommended connections of the accumulator are one size smaller than the suction line
Liquid flood back During normal operation refrigerant enters the compressor as a superheated vapour Liquid flood back occurs when a part of the refrigerant entering the compressor is still in liquid state
A continuous liquid flood back will cause oil dilution and in extreme situations lead to lack of lubrication and high rate of oil leaving the compressor
Liquid flood back test - Repetitive liquid flood back testing must be carried out under TXV threshold operating conditions a high pressure ratio and minimum evaporator load along with the measurement of suction superheat oil sump temperature and discharge gas temperature
During operations liquid flood back may be detected by measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 20degF or less above the saturated suction temperature or should
the discharge gas temperature be less than 65degF above the saturated discharge temperature this indicates liquid flood back
Continuous liquid flood back can occur with a wrong dimensioning a wrong setting or malfunction of the expansion device or in case of evaporator fan failure or blocked air filters
A suction accumulator providing additional protection as explained hereunder can be used to solve light continuous liquid flood back
System design recommendations
bull While the thermostat is off the number of pressure switch resets should be limited to avoid short cycling of the compressor Use dedicated wiring and an additional relay which allows for one shot pump-down
The pump-down allows to store all the refrigerant in the high pressure side circuit On unitary or close-coupled systems where the system refrigerant charge is expected to be both correct and definable the entire system charge may be stored in the condenser during pump-down if all components have been properly sized
Other application needs a liquid receiver to store the refrigerant
Receiver dimensioning requires special attention The receiver shall be large enough to contain part of the system refrigerant charge but it shall not be dimensioned too large A large receiver easily leads to refrigerant overcharging during maintenance operation
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
40 FRCCPC015A722
Specific application recommendations
Low ambient application
Low ambient operations It is recommended that the unit be tested and monitored at minimum load and low ambient conditions as well The following considerations should be taken into account to ensure proper system operating characteristics
The expansion device should be sized to ensure proper control of the refrigerant flow into the evaporator An oversized valve may result in erratic control This consideration is especially important in manifolded units where low load conditions may require the frequent cycling of compressors This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads
The superheat setting of the expansion device should be sufficient to ensure proper superheat levels during low loading periods A minimum of 10degF stable superheat is required
Head pressure control under low ambient conditions Several possible solutions are available to prevent the risk of compressor to vacuum and low pressure differential between the suction and discharge pressures
In air-cooled machines cycling the fans with a head pressure controller will ensure that the fans remain off until the condensing pressure has reached a satisfactory level Variable speed fans can also be used to control the condensing pressure In water-cooled units the same can be performed using a water regulator valve that is also operated by head pressure thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level
The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes
Under very low ambient conditions in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non-return valve in the discharge line is recommended and special care should be taken when designing the discharge line
For further information please contact Danfoss
Low ambient start-up Under cold ambient conditions (lt30degF) upon start-up the pressure in the condenser may be so low that a sufficient pressure differential across the expansion device cannot be developed to properly feed the evaporator
As a result the compressor may go into a deep vacuum which can lead to compressor failure due to internal arcing and instability in the scroll wraps Under no circumstances should the compressor be allowed to operate under vacuum The low-pressure control must be set in accordance with the table on page 35 in order to prevent this from happening
Early feeding of the evaporator and management of the discharge pressure could help to attenuate these effects
Low pressure differentials can also cause the expansion device to laquohuntraquo erratically which might cause surging conditions within the evaporator with liquid spillover into the compressor This effect is most pronounced during low load conditions which frequently occur during low ambient conditions
Unlike the reciprocating compressor a scroll doesnrsquot have dead volume Neither does it have a suction valve causing pressure drop As a result a scroll compressor has a high volumetric efficiency even at low suction pressure In systems such as ice makers and milk cooling tanks this high capacity at low temperature shortens the cooling time
When moving from a reciprocating compressor to a scroll compressor the selection shall always be made based on cooling capacity at the application rating point Never make a selection based on equivalent displacement
Scroll and reciprocating
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
41FRCCPC015A722
Specific application recommendations
Low load operations The compressor should be run for a minimum period to ensure that the oil has sufficient time to properly return to the compressor sump and
that the motor receives enough cooling under conditions of lowest refrigerant mass flow
Brazed plate heat exchangers
A brazed plate heat exchanger needs very little internal volume to satisfy the heat transfer requirements Consequently the heat exchanger offers very little internal volume for the compressor to draw vapour from the suction side The compressor can then quickly enter into a vacuum condition It is therefore important that the expansion device be sized correctly and that a sufficient pressure differential across the expansion device be available to ensure adequate refrigerant feed into the evaporator This aspect is of special concern when operating the unit under low ambient and load conditions For further information on these conditions please refer to the previous sections
Due to the small volume of the brazed plate heat exchanger no pump-down cycle is normally required The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor
When using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up At least 3 ft of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start-up the supply of cooling water to the heat exchanger may be opened before the compressor starts to remove superheat and condense the incoming discharge gas more quickly
Water utilising systems Apart from residual moisture in the system after commissioning water could also enter the refrigeration circuit during operation Water in the system shall always be avoided Not only because it can shortly lead to electrical failure sludge in sump and corrosion but in particular because it can cause serious safety risks
Common causes for water leaks are corrosion and freezing
Corrosion Materials in the system shall be compliant with water and protected against corrosion
Freezing When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks During off periods water inside heat exchangers could start freezing when ambient temperature is lower than 30degF During on periods ice banking could occur when the circuit is running continuously at too low load Both situations should be avoided by connecting a pressure and thermostat switch in the safety line
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
42 FRCCPC015A722
Sound and vibration management
Running sound level
Stopping sound level
Sound generation in a refrigeration system
Compressor sound radiation
MLZMLM are designed with features to reduce the sound level when a compressor is running
Sound levels are at rated (medium temperature) conditions
MLZMLM have a unique discharge valve design that minimizes stopping noise This results in very low shutdown sound
Typical sound and vibration in refrigeration systems encountered by design and service engineers may be broken down into the following three source categories
Sound radiation This generally takes an airborne path
Mechanical vibrations These generally extend along the parts of the unit and structure
Gas pulsation This tends to travel through the cooling medium ie the refrigerant
The following sections will focus on the causes and methods of mitigation for each of the above sources
For sound radiating from the compressor the emission path is airborne and the sound waves are travelling directly from the machine in all directions
The MLZMLM scroll compressors are designed to be quiet and the frequency of the sound generated is pushed into the higher ranges which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound
Use of sound-insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting soundvibration within the unit come into direct contact with any non insulated parts on the walls of the unit
Because of the unique design of a full-suction gas amp oil cooled motor compressor body insulation across its entire operating range is possible
During start-up transients it is natural for the compressor sound level to be slightly higher than during normal running MLZMLM scroll compressors exhibit very little increased start-up transient sound If a 3-phase model is miswired the compressor will run in reverse Reverse
compressor rotation is characterized by an objectionable sound To correct reverse rotation disconnect power and switch any two of the three power leads at the unit contactor Never switch leads at the compressor terminals
Starting sound level
Model50 Hz 60 Hz
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
Sound power (dBA)Without jacket
Sound power (dBA)With jacket
MLZMLM015 67 57 71 60
MLZMLM019 67 57 71 60
MLZMLM021 67 57 71 60
MLZMLM026 67 59 71 62
MLZMLM030 69 62 73 65
MLZMLM038 69 63 74 66
MLZMLM042 71 63 74 66
MLZMLM045 71 63 74 66
MLZMLM048 72 64 74 67
MLZMLM058 74 66 78 70
MLZMLM066 74 66 78 70
MLZMLM 076 74 66 78 70
Maximum sound is +5dBA
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
43FRCCPC015A722
Sound and vibration management
Mechanical vibrations Vibration isolation constitutes the primary method for controlling structural vibration MLZMLM scroll compressors are designed to produce minimal vibration during operations The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very effective in reducing vibration being transmitted from the compressor(s) to the unit Rubber grommets are supplied with all MLZMLM compressors Once the supplied rubber grommets have been properly mounted vibration transmitted from the compressor base plate to the unit are held to a strict minimum
In addition it is extremely important that the frame supporting the mounted compressor be of sufficient mass and stiffness to help dampen any residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three-dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations page 36
Gas pulsation The MLZMLM scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio On installations where the pressure ratio lies beyond the typical range testing should be conducted under all expected conditions and operating
configurations to ensure that minimum gas pulsation is present If an unacceptable level is identified a discharge muffler with the appropriate resonant volume and mass should be installed This information can be obtained from the component manufacturer
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
44 FRCCPC015A722
Installation
Each MLZMLM compressor is shipped with printed Instructions for installation These Instructions can also be downloaded from our web site
wwwdanfosscom or directly from httpinstructionsccdanfosscom
Compressor handling and storage
Compressor holding charge
Compressors are provided with a lifting lug This lug should always be used to lift the compressor Once the compressor is installed the lifting lug should never be used to lift the complete installation The compressor must be handled
with caution in the vertical position with a maximum inclination of 15deg from vertical Store the compressor between -31degF and 131degF not exposed to rain or corrosive atmosphere
Each compressor is shipped with a nominal dry nitrogen holding charge between 6 and 10PSI and is sealed with elastomer plugs The plugs should be removed with care to avoid oil loss when the holding charge is released Remove the suction plug first and the discharge plug
afterwards The plugs shall be removed only just before connecting the compressor to the installation in order to avoid moisture entering the compressor When the plugs are removed it is essential to keep the compressor in an upright position to avoid oil spillage
System cleanliness The refrigeration system regardless of the type of compressor used will only provide high efficiency and good reliability along with a long operating life if the system contains solely the refrigerant and oil it was designed for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations
The presence of non-condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a
mesh screen and can cause considerable damage within a bearing assembly The use of highly hygroscopic PVE oil in MLZ compressors requires that the oil be exposed to the atmosphere just as little as possible
During the manufacturing process circuit contamination may be caused bybull Brazing and welding oxidesbull Filings and particles from the removal of burrs in pipe-workbull Brazing fluxbull Moisture and air
Compressor mounting Maximum inclination from the vertical plane while operating must not exceed 7 degrees All compressors are delivered with 4 rubber grommets and metal sleeves Compressors
must always be mounted with these grommets Recommended torque for mounting bolts 100 lbf-in (plusmn10 lbf-in)
Brazing material For copper suction and discharge fittings use copper-phosphorus brazing material Sil-Fosreg and other silver brazing materials are also acceptable
If flux is required for the brazing operation use coated rod or flux core wire To avoid system contamination do not brush flux on
Tube brazing procedure Do not bend the compressor discharge or suction lines or force system piping into the compressor connections because this will increase
stresses that are a potential cause of failure Recommended brazing procedures and material are described on following page
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
45FRCCPC015A722
Installation
Compressor connection When brazing the compressor fittings do not overheat the compressor shell which could severely damage certain internal components due to excessive heating Use of a heat shield andor a heat-absorbent compound is highly recommended For brazing the suction and discharge connections the following procedure is advisedbull Make sure that no electrical wiring is connected to the compressorbull Protect the terminal box and compressor painted surfaces from torch heat damage (see diagram)bull Use only clean refrigeration-grade copper tubing and clean all connectionsbull Purge nitrogen through the compressor in order to prevent against oxidation and flammable conditions The compressor should not be exposed to the open air for extended periodsbull Use of a double-tipped torch is recommendedbull Apply heat evenly to area A until the brazing temperature is reached Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well and then begin adding the brazing material Move the torch evenly around the joint in applying only enough brazing material to flow the full circumference of the jointbull Move the torch to area C only long enough to draw the brazing material into the joint but not into the compressorbull Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing
Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause
substantial damage to the internal parts of the system and compressor
The PVE oil used in MLZ compressors is highly hygroscopic and will rapidly absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor
Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may result in serious personal injury Pressure gauges must be used to ensure all pressures are at atmospheric level
For more detailed information on the appropriate materials required for brazing or soldering please contact the product manufacturer or distributor For specific applications not covered herein please contact Danfoss for further information
Heat shield
C B A
Brazed connectionODF tube
Rotolock connection
sizes
MLZMLM015-026Suction 34 114
Discharge 12 1
MLZMLM030-045Suction 78 114
Discharge 12 1
MLZMLM048Suction 78 114
Discharge 34 114
MLZMLM058-076Suction 118 134
Discharge 78 114
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
46 FRCCPC015A722
Moisture obstructs the proper functioning of the compressor and the refrigeration system
Air and moisture reduce service life and increase condensing pressure and cause excessively high discharge temperatures which can destroy the lubricating properties of the oil Air and moisture also increase the risk of acid formation giving rise to copper platting All these phenomena can cause mechanical and electrical compressor failure
For these reasons itrsquos important to perform a vacuum dehydration on the system to remove all residual moisture from the pipe-work after assembly
MLZ and MLM compressors are delivered with lt 100 ppm moisture level The required moisture level in the circuit after vacuum dehydration must be lt 100 ppm for systems with an MLZ and lt 300 ppm for systems with an MLM compressor
bull Never use the compressor to evacuate the system
bull Connect a vacuum pump to both the LP amp HP sides
bull Evacuate the system to a pressure of 002 in Hg (500 μm Hg) absolute
bull Do not use a megohm meter nor apply power to the compressor while itrsquos under vacuum as this may cause internal damage
Vacuum evacuation and moisture removal
Refrigerant charging It is recommended that system charging be done using the weighed charge method adding refrigerant to the high side of the system Charging the high and low sides of a system with gas simultaneously at a controlled rate is also an acceptable method Do not exceed the recommended unit charge and never charge liquid to the low side
Vacuum or charge from one side can seal the scrolls and result in a non-starting compressor When servicing always ensure that LPHP pressures are balanced before starting the compressor
Be sure to follow all government regulations regarding refrigerant reclamation and storage
Liquid line filter driers A properly sized amp type of drier is required Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness (EPD) Danfoss recommends DCL (solid core) driers for the MLM compressor (R22 with Alkylbenzene) and DML (100 molecular sieve) driers for MLZ compressors (R404A R507 R134a R22R407AR407F) with PVE oil
For servicing of existing installations where acid formation may be present the Danfoss DCL solid core filter drier containing activated alumina is recommended
After burn out remove amp replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line
Insulation resistance and dielectric strength
Insulation resistance must be higher than 1 megohm when measured with a 500 volt direct current megohm tester
Each compressor motor is tested at the factory with a high potential voltage (hi-pot) that exceeds the UL requirement both in potential and in duration Leakage current is less than 05 mA
MLZMLM scroll compressors are configured with the pump assembly at the top of the shell and the motor below As a result the motor can be partially immersed in refrigerant and oil The presence of refrigerant around the motor windings will result in lower resistance
values to ground and higher leakage current readings Such readings do not indicate a faulty compressor and should not be cause for concern
In testing insulation resistance Danfoss recommends that the system be first operated briefly to distribute refrigerant throughout the system Following this brief operation retest the compressor for insulation resistance or current leakage
Never reset a breaker or replace a fuse without first checking for a ground fault (a short circuit to ground) Be alert for sounds of arcing inside the compressor
Installation
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
47FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors are packed individually in a cardboard box They can be ordered in any quantity Minimum ordering quantity = 1 As far as possible Danfoss will ship the boxes on full pallets of 6 or 9 compressors according below table
bull Each box also contains following accessoriesbull 4 grommetsbull 4 assemblies of self tapping US thread bolts washers and sleevesbull 4 additional sleevesbull 1 screw for earth connectionbull Run capacitors are available as accessories for motor code 5 (220-240V150Hz)
Depending on model and shipping type a run capacitor may be included (see table)
Compressors are not packed individually but are shipped all together on one pallet They can be ordered in quantities of full pallets only multiples of 12 or 16 compressors according below table
Each industrial pack pallet contains following accessories
bull 4 grommets per compressorbull 4 sleeves per compressor
Packaging
Single pack
Packaging details
Danfoss palletsOptimized for overseas container loading amp
European storage racksUS pallets
Optimized for overseas container loading
Code number 121Uhellip 120Uhellip
Pack type Industrial pack Single pack Industrial pack Single pack
Compressors per pallet 12 6 16 16
Static stacking of pallets 4 4 4 4
Ship
ped
acce
ssor
ies Run capacitor (for single phase models) Not included Not included Not included Not included
Screw for earth connection Included Included Not included Included
4 grommets per compressor Included Included Included Included
4 assemblies of self tapping US thread bolt + washer + sleeve per compressor Not included Included Not included Included
4 extra sleeves per compressor Included Included Included Included
Quantity for full pallets Single packs can be ordered per 1 Stacking only allowed for full pallets with identical products per pallet
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
48 FRCCPC015A722
Ordering information and packaging
Single pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8036 121U8002 121U8024 - -
MLZ019 T P 9 121U8060 121U8038 121U8004 121U8026 - -
MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 - -
MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 - -
MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 - -
MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 - -
MLZ042 T C 9 - - - 121U8419 - -
MLZ045 T C 9 - 121U8048 121U8014 - - -
MLZ048 T C 9 - 121U8050 121U8016 - - -
MLZ058 T C 9 - 121U8052 121U8018 - - -
MLZ066 T C 9 - 121U8054 121U8020 - - -
MLZ076 T C 9 - 121U8056 121U8022 - - -
US
palle
t
MLZ015 T P 9 120U8058 120U8036 120U8002 120U8024 - 120U8413
MLZ019 T P 9 120U8060 120U8038 120U8004 120U8026 - 120U8266
MLZ021 T P 9 120U8062 120U8040 120U8006 120U8028 - 120U8272
MLZ026 T P 9 120U8064 120U8042 120U8008 120U8030 - 120U8278
MLZ030 T C 9 120U8066 120U8044 120U8010 120U8032 - 120U8284
MLZ038 T C 9 120U8068 120U8046 120U8012 120U8034 - 120U8296
MLZ042 T C 9 120U8399 - - - - -
MLZ045 T C 9 - 120U8048 120U8014 - 120U8332 120U8302
MLZ048 T C 9 - 120U8050 120U8016 - 120U8338 120U8308
MLZ058 T C 9 - 120U8052 120U8018 - 120U8344 120U8314
MLZ066 T C 9 - 120U8054 120U8020 - 120U8350 -
MLZ076 T C 9 - 120U8056 120U8022 - 120U8356 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8513 121U8553 121U8529 121U8521 121U8537 121U8545
MLZ019 T T 9 121U8515 121U8555 121U8531 121U8523 121U8539 121U8547
MLZ021 T T 9 121U8517 121U8557 121U8533 121U8525 121U8541 121U8549
MLZ026 T T 9 121U8519 121U8559 121U8535 121U8527 121U8543 121U8551
MLZ030 T Q 9 121U8561 121U8597 121U8573 121U8567 121U8581 121U8589
MLZ038 T Q 9 121U8563 121U8599 121U8575 121U8569 121U8583 121U8591
MLZ042 T Q 9 121U8565 - - 121U8571 - -
MLZ045 T Q 9 - 121U8601 121U8577 - 121U8585 121U8593
MLZ048 T Q 9 - 121U8603 121U8579 - 121U8587 121U8595
MLZ058 T Q 9 - 121U8627 121U8609 - 121U8615 121U8621
MLZ066 T Q 9 - 121U8623 121U8605 - 121U8611 121U8617
MLZ076 T Q 9 - 121U8625 121U8607 - 121U8613 121U8619
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
49FRCCPC015A722
Ordering information and packaging
Industrial pack
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
Dan
foss
pal
let
MLZ015 T P 9 - 120U8035 121U8001 121U8023 - -
MLZ019 T P 9 121U8059 121U8037 121U8003 121U8025 - -
MLZ021 T P 9 121U8061 121U8039 121U8005 121U8027 - -
MLZ026 T P 9 121U8063 121U8041 121U8007 121U8029 - -
MLZ030 T C 9 121U8065 121U8043 121U8009 121U8031 - -
MLZ038 T C 9 121U8067 121U8045 121U8011 121U8033 - -
MLZ042 T C 9 - - - 121U8418 - -
MLZ045 T C 9 - 121U8047 121U8013 - - -
MLZ048 T C 9 - 121U8049 121U8015 - - -
MLZ058 T C 9 - 121U8051 121U8017 - - -
MLZ066 T C 9 - 121U8053 121U8019 - - -
MLZ076 T C 9 - 121U8055 121U8021 - - -
US
palle
t
MLZ015 T P 9 120U8057 120U8035 120U8001 120U8023 - 120U8412
MLZ019 T P 9 120U8059 120U8037 120U8003 120U8025 - 120U8265
MLZ021 T P 9 120U8061 120U8039 120U8005 120U8027 - 120U8271
MLZ026 T P 9 120U8063 120U8041 120U8007 120U8029 - 120U8277
MLZ030 T C 9 120U8065 120U8043 120U8009 120U8031 - 120U8283
MLZ038 T C 9 120U8067 120U8045 120U8011 120U8033 - 120U8295
MLZ042 T C 9 120U8398 - - - - -
MLZ045 T C 9 - 120U8047 120U8013 - 120U8331 120U8301
MLZ048 T C 9 - 120U8049 120U8015 - 120U8337 120U8307
MLZ058 T C 9 - 120U8051 120U8017 - 120U8343 120U8313
MLZ066 T C 9 - 120U8053 120U8019 - 120U8349 -
MLZ076 T C 9 - 120U8055 120U8021 - 120U8355 -
Brazed version
Rotolock version
Compressors Model variation Connections Features Voltage
code 1Voltage code 2
Voltage code 4
Voltage code 5
Voltage code 7
Voltage code 9
MLZ015 T T 9 121U8512 121U8552 121U8528 121U8520 121U8536 121U8544
MLZ019 T T 9 121U8514 121U8554 121U8530 121U8522 121U8538 121U8546
MLZ021 T T 9 121U8516 121U8556 121U8532 121U8524 121U8540 121U8548
MLZ026 T T 9 121U8518 121U8558 121U8534 121U8526 121U8542 121U8550
MLZ030 T Q 9 121U8560 121U8596 121U8572 121U8566 121U8580 121U8588
MLZ038 T Q 9 121U8562 121U8598 121U8574 121U8568 121U8582 121U8590
MLZ042 T Q 9 121U8564 - - 121U8570 - -
MLZ045 T Q 9 - 121U8600 121U8576 - 121U8584 121U8592
MLZ048 T Q 9 - 121U8602 121U8578 - 121U8586 121U8594
MLZ058 T Q 9 - 121U8626 121U8608 - 121U8614 121U8620
MLZ066 T Q 9 - 121U8622 121U8604 - 121U8610 121U8616
MLZ076 T Q 9 - 121U8624 121U8606 - 121U8612 121U8618
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
50 FRCCPC015A722
Spare parts amp accessories
Run capacitors for PSC wiring
Start capacitors for CSR wiring
Solder sleeve adapter sets
Rotolock nuts and sleeves kit
Rotolock adapters
Code ndeg Description Application Packaging Pack size
120Z0126 Rotolock adaptor set (1-14 ~ 34) (1 ~ 12) MLZMLM 015-019-021-026 Multipack 6
120Z0127 Rotolock adaptor set (1-14 ~ 78) (1 ~ 12) MLZMLM 030-038-042-045 Multipack 6
120Z0128 Rotolock adaptor set (1-14 ~ 78) (1-14 ~ 34) MLZMLM 048 Multipack 6
120Z0129 Rotolock adaptor set (1-34 ~ 1-18) (1-14 ~ 78) MLZMLM 058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5074 Rotolock nuts 114 and 1 with sleeves and gaskets MLZMLM015-045 Multipack 6
120Z5076 2 rotolock nuts 114 with sleeves and gaskets MLZMLM048 Multipack 6
120Z5075 Rotolock nuts 114 and 134 with sleeves and gaskets MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 015-019-021-026 suction Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 030-038-042-045-048 suction Multipack 10
120Z0364 Rotolock adaptor (1-34 ~ 1-18) MLZMLM 058-066-076 suction Multipack 10
120Z0365 Rotolock adaptor (1 ~ 12) MLZMLM 015-019-021-026-030-038-042-045 discharge Multipack 10
120Z0366 Rotolock adaptor (1-14 ~ 34) MLZMLM 048 discharge Multipack 10
120Z0367 Rotolock adaptor (1-14 ~ 78) MLZMLM 058-066-076 discharge Multipack 10
Code ndeg Description Application Packaging Pack size
8173231 PSC wiring Run capacitor 40 microF motor voltage code 5 - 220-240V 1 50 Hz MLZMLM015 Multipack 10
120Z0051 PSC wiring Run Capacitor 70 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM019-021-026 Multipack 10
8173233 PSC wiring Run Capacitor 50 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173234 PSC wiring Run Capacitor 55 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0399 CSR wiring Start Capacitor 145-175 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM015-019-021-026 Multipack 10
120Z0400 CSR wiring Start Capacitor 161-193 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM030 Multipack 10
8173001 CSR wiring Start Capacitor 88-108 microF motor voltage code 5 - 220-240V 1 50Hz MLZMLM038-042 Multipack 10
Code ndeg Description Application Packaging Pack size
120Z0393 Starting relay RVA9CKL MLZMLM 015-019-021-026 Multipack 10
120Z0394 Starting relay RVA3EKL MLZMLM 030 Multipack 10
120Z0395 Starting relay RVA4GKL MLZMLM 038-042 Multipack 10
Starting relays for CSR wiring
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
51FRCCPC015A722
Spare parts amp accessories
Mounting kits
Discharge thermostat kit
Crankcase heater
Rotolock service valves and valve sets (without gasket)
Code No Description Application Packaging Pack Size
7750009 Discharge thermostat kit All models Multipack 10
7973008 Discharge thermostat kit All models Industry pack 50
Code No Description Application Packaging Pack Size
120Z5040 Belt type crankcase heater 65 W 230 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5041 Belt type crankcase heater 5570W 400460 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z5042 Belt type crankcase heater 70 W 575 V CE mark UL (Wire length 1270 mm) MLZMLM 015-019-021-026 Multipack 4
120Z0059 Belt type crankcase heater 65 W 230V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-042-045-048-058-066-076 Multipack 6
120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL (Wire length 1000 mm) MLZMLM 030-038-045-048-058-066-076 Multipack 6
120Z5012 Belt type crankcase heater 70W 460V CE mark UL MLZMLM030-076 Multipack 4
120Z5013 Belt type crankcase heater 70 W 575V CE mark UL MLZMLM030-076 Multipack 4
Code ndeg Description Application Packaging Pack size
7968004 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF)Discharge MLMZ015-026-045
Industry pack 50
8168031 Rotolock valve V06 (1rdquo Rotolock 12rdquo ODF) Multipack 6
7968006 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Suction MLMZ015-026Discharge MLMZ048
Industry pack 42
8168029 Rotolock valve V04 (1rdquo14 Rotolock 34rdquo ODF) Multipack 6
7968007 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Suction MLMZ030-048Discharge MLMZ058-076
Industry pack 36
8168030 Rotolock valve V05 (1rdquo14 Rotolock 78rdquo ODF) Multipack 6
7968009 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF)Suction MLMZ058-076
Industry pack 24
8168028 Rotolock valve V02 (1rdquo34 Rotolock 1rdquo18 ODF) Multipack 6
7703008 Valve set V02 (134rotolock 118 ODF) V05 (Rotolock 114 78 ODF) MLZMLM058-066-076 Multipack 6
Code ndeg Description Application Packaging Pack size
120Z5005 Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers MLZMLM Single pack 1
120Z5067
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM015-045LLZ013-015-018 Single pack 1
120Z5069Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleeves
MLZMLM048 Single pack 1
120Z5068
Mounting kit for 1 scroll compressor including 4 grommets 4 sleeves 4 bolts 4 washers rotolock connection kit for suction discharge and economizer fitting for 1 scroll compressor including 3 Teflon seals 2 nuts 3 sleevesTeflon seals sleeves nuts 1rdquo14 and 1rdquo34
MLZMLM058-076LLZ024-033 Single pack 1
120Z0407 Rigid grommets and washers for tandem rack assembly Set for 8 compressors MLZMLM Single pack 1
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
52 FRCCPC015A722
Spare parts amp accessories
Magnetic discharge non return valve
Lubricant
IP54 upgrade kit
Code No Description Application Packaging Pack Size
120Z5046 Magnetic discharge non return valve MLZMLM058-066-076 Multipack 6
Code No Description Application Packaging Pack Size
120Z5034 PVE lubricant 1 litre can 320HV (FVC68D) MLZ Multipack 12
Code No Description Application Packaging Pack Size
118U0056 IP54 upgrade kit for round terminal box MLZMLM015 - 019 - 021 - 026 Multipack 6
118U0057 IP54 upgrade kit for square terminal box MLZMLM030-038-042-045-048-058-066-076 Multipack 6
Acoustic hood
Terminal box
Manifolding service kit
Code No Description Application Packaging Pack Size
120Z5043 Acoustic hood MLZMLM015 - 019 - 021 - 026 Single pack 1
120Z5044 Acoustic hood MLZMLM030 - 038 - 042 - 045 - 048 Single pack 1
120Z5045 Acoustic hood MLZMLM058 - 066 - 076 Single pack 1
Code No Description Application Packaging Pack Size
120Z5015 Round terminal box (P amp T version) MLZMLM015 - 019 - 021 - 026 Multipack 10
120Z5018 Square terminal box (C amp Q version) MLZMLM030-038-042-045-058-066-076 Multipack 10
Code No Description Application Packaging Pack Size
120Z5073Oil equalisation kit including 2 oil sight glass adaptors rotolock nuts sleeves and gaskets feet spacers and washers for 2 compressors
All models Multipack 6
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Application guideline
53FRCCPC015A722
Updates
Previous Version
Previous Danfoss layout
Page 6 Label
Page 8-9 50Hz-60Hz Technical specifications data
Page 15 Three phase amp Single phase electrical characteristics values
Page 16 PTCSCR wiring voltage codes Page 17 Nominal capacitor value amp relays
Page 31 Running sound level data
Page 36 Packaging details Page 37 Ordering information amp packaging
Page 38-39 Spare parts amp accessories
Current Version
New Danfoss layout Added R407A amp R407F models Page 8 Updated label Added T amp Q rotolock
connections in nomenclature Serial number explanation is removed
Page 9-12 Updated 50Hz-60Hz Technical specifications data further to ASERCOM certification
Page 12-17 Added Technical specifications data for R404AR507 R22 R134a R407A amp R407F
Page 18-20 Added Rotolock outline diagram for MLZMLM015-019-021-026-030-038-045-048-058-066-076
Page 21 Added Torque requirement amp Schrader valve corecover values
Page 22 Added code7 amp code9 in motor voltage Page 23 Updated Three phase electrical
characteristics values with code 79 amp Single phase values
Page 25 Updated PTCSCR wiring voltage codes Page 25 Updated Nominal capacitor value amp
relays Page 32-33 Added operating envelopes
for R407A(MLZ015-066 MLZ076) R407F(MLZ015-066 MLZ076)
Page 35 Added Maximum test pressure amp R407AR407F pressure values
Page 42 Updated Running sound level data Page 45 Added Brazed amp Rotolock connection
size table Page 47 Updated Packaging details Page 48-49 Updated ordering information
amp packaging as Brazed amp Rotolock version seperately
Page 50-52 Updated Spare parts amp accessories with Starting relays for CSR wiring Solder sleeve adapter sets Rotolock nuts and sleeves kit Rotolock service valves amp valve sets Mounting kits Magnetic discharge non return valve IP54 upgrade kit Acoustic hood Terminal box amp Manifolding servicing kit
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29
Danfoss Commercial Compressors is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs
We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business and positioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents
Danfoss Inverter Scrolls
Danfoss Turbocor Compressors
Danfoss Scrolls
Danfoss Optyma Condensing Units
Secop Compressors for Danfoss
Danfoss Maneurop Reciprocating Compressors
FRCCPC015A722 - April 2015 - Replaces FRCCPC015A122 - July 2009 copy Copyright Danfoss | Commercial Compressors | 201504
Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes
httpdanfossuscom
Danfoss Commercial Compressors BP 331 01603 Treacutevoux Cedex France | +334 74 00 28 29