CHP16 SERIES UNITS - LENNOX EMEAwebmanuals.lennoxeurope.com/Out of Production...CHP16 series units in the 2-5 ton sizes were introduced in the spring of 1990. The single package cooling

SERVICE CHP16UNIT

INFORMATION

Page 1 1991 Lennox Industries Inc.

Corp. 9122-L7 Litho U.S.A.

2-5 TON UNITS

CHP16 SERIES UNITS2 THROUGH 5 TON UNITS

CHP16 series units in the 2-5 ton sizes were introduced in

the spring of 1990. The single package cooling units may

be used in both residential and commercial applications.

Electric heat is available in several Kw sizes. Units are

designed for rooftop or side of building installation with ei�

ther bottom or horizontal discharge.

For commercial applications, the CHP16 is designed to

accept any of several different thermostat control systems

with minimum field wiring. Control options such as econo�

mizer, warm up kit, Honeywell W973 control or Honeywell

W7400 control connect to the unit with jack-plugs. When

plugged in the controls become an integral part of the unit

wiring. Commercial units are also equipped with a low volt�

age terminal strip to facilitate thermostat field wiring.

All specifications in this manual are subject to change.

TABLE OF CONTENTSIntroduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications Pages 2�4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Data Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessory Air Resistance Data Page 5. . . . . . . . . . . . . . . . . . . . . Diffuser Air Resistance Data Page 6. . . . . . . . . . . . . . . . . . . . . . . Blower Performance Data Pages 6�8. . . . . . . . . . . . . . . . . . . . . . Parts Arrangement Page 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I - APPLICATION Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II - UNIT COMPONENTS Page 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Box Components Pages 9�16. . . . . . . . . . . . . . . . . . . . . . Control Transformer Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low Voltage Terminal Strip Page 11. . . . . . . . . . . . . . . . . . . . . . . Low Voltage Fuse Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Contactor Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . Indoor Blower Relay Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defrost Relay K4 Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latch Relay Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer Relay Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defrost Relay K10 Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Potential Relay Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Start Capacitor Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Capacitor Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Run Capacitor Page 13. . . . . . . . . . . . . . . . . . . . . . Defrost Control Pages 14�16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plumbing Components Pages 16�22. . . . . . . . . . . . . . . . . . . . . . . Compressor Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Pressure Limit Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loss of Charge Switch Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . Defrost Thermostat Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defrost Pressure Switch Page 20. . . . . . . . . . . . . . . . . . . . . . . . . Outdoor Coil Page 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indoor Coil Pages 20,21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermometer Well Page 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outdoor Fan and Motor Page 22. . . . . . . . . . . . . . . . . . . . . . . . . Outdoor Fan Motor Capacitor Page 22. . . . . . . . . . . . . . . . . . . . Indoor Blower Motor Page 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . Blower Motor Capacitor Page 22. . . . . . . . . . . . . . . . . . . . . . . . .

III - OPTIONAL ECH16 ELECTRIC HEAT Pages 23�34. . . . . . . . . . Matchups and Ratings Pages 23�28. . . . . . . . . . . . . . . . . . . . . . . Components Pages 23�34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conventional Relays and Contactors Page 23. . . . . . . . . . . . . . Resistor Page 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Specification Tables Pages 24�28. . . . . . . . . . . . . . Electric Heat Parts Arrangements Pages 29�32. . . . . . . . . . . . . Thermal Heat Relays Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . Time Delay Page 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current Limiting Fuses Page 33. . . . . . . . . . . . . . . . . . . . . . . . . . Primary High Temperature Limit Page 33. . . . . . . . . . . . . . . . . .

Secondary High Temperature Limit Pages 33�34. . . . . . . . . . . . Heating Elements Page 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV - PLACEMENT AND INSTALLATION Page 34. . . . . . . . . . . . . . . V - ELECTRICAL CONNECTIONS Page 34. . . . . . . . . . . . . . . . . . VI - START�UP Pages 34�35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII - REFRIGERATION SYSTEM SERVICE CHECKS Page 35. . .

Gauge Manifold Attachment Page 35. . . . . . . . . . . . . . . . . . . . . Charging Pages 35�36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VIII - BLOWER OPERATION AND ADJUSTMENT Pages 36�40. . . Blower Operation Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Determining Unit CFM Pages 36�37. . . . . . . . . . . . . . . . . . . . . . . Blower Speed Adjustment (208/230V) Pages 37�38. . . . . . . . . . Blower Speed Adjustment (460V & 575V) Pages 38�40. . . . . .

IX - MAINTENANCE Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Filters Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lubrication Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indoor Coil Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Outdoor Coil Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

X - ACCESSORIES Pages 40�63. . . . . . . . . . . . . . . . . . . . . . . . . . . . Lifting Lugs Page 40,41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RMF16 Roof Mounting Frame Pages 41. . . . . . . . . . . . . . . . . . . Economizers Pages 41�50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Condenser Coil Guard Kit Page 50. . . . . . . . . . . . . . . . . . . . . . . Compressor Crankcase Heater Page 50. . . . . . . . . . . . . . . . . . DF16 Downflow Filter Kit Page 50. . . . . . . . . . . . . . . . . . . . . . . . Timed�off Control Kit Page 50,51. . . . . . . . . . . . . . . . . . . . . . . . . . Optional Compressor Monitor Pages 52,54. . . . . . . . . . . . . . . . . Low Ambient Kit Pages 53�55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Roof Curb Power Kit Page 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . Transitions and Supply/Return Diffusers Page 55. . . . . . . . . . . Status Panels Pages 55�63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

XI - FIELD WIRING Pages 64�70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . XII - WIRING DIAGRAMS AND SEQUENCE OF OPERATION

Pages 72�107. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Residential Unit with Basic Thermostat Pages 72�75. . . CHP16H with Three�Position Economizer Pages 76,77. . . . . . CHP16H with Modulating Economizer Pages 78,79. . . . . . . . . . Basic Single�Phase Commercial Unit Pages 80,81. . . . . . . . . . Basic 208/230V Three�Phase Commercial Unit Pages 82,83. . Basic 460V or 575V Commercial Unit Pages 84,85. . . . . . . . . . Basic Three�Position Economizer Operation Pages 86,87. . . . Basic Modulating Economizer Operation Pages 88,89. . . . . . . Warm Up Kit Operation with 3�Position Econ Pages 90,91. . . . Warm Up Kit Operation with Modulating Econ Pages 92,93. . . Night Kit Operation Pages 94,95. . . . . . . . . . . . . . . . . . . . . . . . . . Electric Heat Operation Pages 96�107. . . . . . . . . . . . . . . . . . . . .

Page 2

Model No. CHP16H-261 CHP16H-311

♦ ARI Standard 270 SRN (bels)

*ARI

Standard210

Ratings

Total Cooling Capacity (Btuh)

Total unit watts

SEER (Btuh/Watts)

EER (Btuh/Watts)

Refrigerant (R-22) charge

Evaporator

Blower

Blower wheel nominal diameter x width (in.)

Motor horsepower

Air volume range (cfm)

Evaporator

Coil

Net face area (sq. ft.)

Tube diameter (in.) & Number of rows

Fins per inch

Condenser

Coil


Tube diameter (in.) & Number of rows

Fins per inch

Condenser

Fan

Diameter (in.) & Number of blades

Air volume (cfm)

Motor horsepower

Motor watts

Condensate drain size mpt (in.)

Line voltage dataRecommended max. fuse size (amps)

Minimum circuit ampacity

Electrical characteristics

Optional Lifting Lug Kit

Optional Condenser Coil Guards

Optional Duct Enclosure

Number and size of filters (in.)

Optional Roof Mounting Frame (used with RDE16-41 only)

Optional

•• Economizer

Dampers

Model

No.

3 position

Modulating

Number and sizeof filters (in.)

Optional Ceiling Supply and

Return Air Diffusers

Step Down

Flush

Transition

7.8

23,200

2650

9.8

8.7

2 lbs. 12 oz.

9 x 7

1/3

600 - 1000

3.20

3/8 - 2

15

6.80

3/8 - 1

20

18 - 4

2100

1/6

200

3/4

30

19.0

7.8

28,600

250

9.70

8.80

3 lbs. 10 oz.

9 x 8

1/3

750 - 1250

3.20

3/8 - 2

17

6.80

3/8 - 1.60

20

18 - 4

2000

1/6

160

3/4

30

20.0

208/230 volts - 60 hz - 1 phase

LB-62125DA

LB-82199CA

RDE16-41

(1) 20 x 24 x 1 (fiberglass)

RMF16-41

REMD16-41

REMD16M-41

(1) 14 x 25 x 1 (polyurethane)

RTD9-65

FD9-65

SRTH16-65

Optional Outdoor Air Dampers (manual) OAD3-46/65

•Annual Fuel Utilization Efficiency based on DOE test procedures and FTC labeling regulations.

♦ Sound Rating Number in accordance with ARI Standard 270.

*Rated in accordance with ARI Standard 210 and DOE; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air.

**For LPG units a field changeover kit is required and must be ordered extra.

SPECIFICATIONSCHP16H RESIDENTIAL HORIZONTAL ONLY UNITS

Indoor

Outdoor (1) 14 x 25 x 1 (aluminum mesh)

•• Two stage cooling thermostat required with economizer applications.

with Gravity Exhaust

OptionalElectric

HeatRatings

ECH16R-5

ECH16R-7

ECH16R-10

ECH16-15

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

19,000

99.0%

25,000

99.0%

35,000

99.0%

52,000

99.0%

19,000

99.0%

25,000

99.0%

35,000

99.0%

52,000

99.0%

Page 3

Model No.


*ARI

Standard

210

Ratings

Total Cooling Capacity (Btuh)

Total unit watts

SEER (Btuh/Watts)

EER (Btuh/Watts)


Evaporator

Blower

Blower wheel nom. dia. x width (in.)

Motor horsepower

Air volume range (cfm)

Evaporator

Coil


Tube dia. (in.) & Number of rows

Fins per inch

Condenser

Coil


Tube dia. (in.) & Number of rows

Fins per inch

Condenser

Fan

Diameter (in.) & Number of blades

Air volume (cfm)

Motor horsepower

Motor watts


Line voltage Recommended max. fuse size (amps)

Minimum circuit ampacity




7.8

34,000

3910

9.60

8.70

4 lbs. 12 oz.

10 x 7

1/3

900 - 1500

4.10

3/8 - 2

15

8.60

3/8 - 2

20

20 - 4

2200

1/6

220

3/4

45

27.0

208/230 volts - 60 hz - 1 phase

LB-62125DA

LB-82199CC

8.0

46,500

5470

9.50

8.50

5 lbs. 9 oz.

10 x 8

1/2

1200 - 2000

5.80

3/8 - 2

15

14.30

3/8 - 1.4

20

24 - 4

4000

1/4

340

3/4

60

36.0

8.0

56,000

6665

9.4

8.40

7 lbs. 0 oz.

12 x 8

3/4

1500 - 2500

5.80

3/8 - 2

15

14.30

3/8 - 2

20

24 - 4

3600

1/4

360

3/4

60

42.0

LB-82199CB

Optional Outdoor Air Dampers (manual) OAD16-65OAD16-41

Outer coil

Inner coil

data

CHP16R-651CHP16R-411 CHP16R-511




**For LPG units a field changeover kit is required and must be ordered extra.

8.40 5.90 13.80

SPECIFICATIONSCHP16R RESIDENTIAL UNITS

OptionalElectric

HeatRatings

ECH16R-5

ECH16R-7

ECH16R-10

ECH16-15

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

19,000

99.0%

26,000

99.0%

36,000

99.0%

53,000

99.0%

27,000

99.0%

37,000

99.0%

54,000

99.0%

ECH16R-10

ECH16-15

Output Btuh

•A.F.U.E.

Output Btuh

•A.F.U.E.

70,000

99.0%

71,000

99.0%

88,000

99.0%

27,000

99.0%

37,000

99.0%

54,000

99.0%

71,000

99.0%

88,000

99.0%-----

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Page 4

Model No. CHP16-411


*ARIStandard210Ratings

Total Cooling Capacity (Btuh)Total unit wattsSEER (Btuh/Watts)EER (Btuh/Watts)


EvaporatorBlower

Blower wheel nominal dia. x width (in.)Motor horsepowerAir volume range (cfm)

EvaporatorCoil

Net face area (sq. ft.)Tube dia. (in.) & No of rows & Fins/in.

Condenser

Coil

Net face area (sq. ft.) outer/innerTube diameter (in.) & Number of rowsFins per inch

Condenser

Fan

Diameter (in.) & Number of bladesAir volume (cfm)Motor horsepower & Motor watts


Line voltage fuse size (amps)

Minimum circuit




7.834,0003910

9.608.70

4 lbs. 12 oz.

10 x 71/3

900 - 15004.10

3/8 - 2 - 158.60/8.403/8 - 2

2020 - 42200

1/6 - 2403/445

208/230 volts - 60 hz - 1 or 3 phase 460 or 575 volts - 3 phase

CHP16-511 CHP16-651

8.0

46,50054709.50

8.505 lbs. 9 oz.

10 x 81/2

1200 - 20005.80

3/8 - 2 - 1514.30/5.903/8 - 1.40

2024 - 44000

1/4 - 3403/460

8.056,0006665

9.408.40

7 lbs. 0 oz.

12 x 83/4

1500 - 25005.80

3/8 - 2 - 1514.30/13.80

3/8 - 220

24 - 4

36001/4 - 360

3/460

LB-82199CB

Optional Outdoor Air Dampers (manual) OAD16-65OAD16-41

CHP16-413 CHP16-513 CHP16-653

Data

(60hz)

Recommended max.

ampacity

208/230v1 ph3 ph

460v - 3 ph

208/230v1 ph3 ph

460v - 3 ph

30 40 4515 20 25

27.0 36.0 42.020.0 26.0 29.0

10.0 14.0 16.0

Optional Downflow adaptor kit Model no, Filters

Optional Roof Mounting Frame

OptionalEconomizerDampers

Model No.

3 position

Modulating

No. & sizeof filters (in.)

Optional

EconomizerDampers

Model No.

3 position

Modulating

No. & sizeof filters (in.)

Horizontal

LB-62125DA

LB-82199CC

Optional Ceiling Supply andReturn Air Diffusers

Step Down

FlushTransition

Optional Controls Selection

Electromechanical Thermostat

Honeywell W973 Control System with T7067 Thermostat

Honeywell W7400 Control System with T7400 Thermostat

Flexstat Thermostat (discontinued as an option after August 1989)

Prostat Thermostat

T7300 Thermostat

•• Commercial Controls

Optional Control MountsDownflow application

Horizontal application

Optional Gravity Exhaust DampersOptional Roof Curb Power Entry Kit

DF16-65, (1) 20x25x1 (polyurethane)DF16-41, (1)�16x25x1 (polyurethane)

RMF16-41 RMF16-41 or RMF16-65

REMD16-41 REMD16-65

(1) 14 x 25 x 1 (polyurethane) (1) 18 x 25 x 1 (polyurethane)

REMD16M-41 REMD16M-65

(1) 14 x 25 x 1 (aluminum mesh) (1) 18 x 25 x 1 (aluminum mesh)

EMDH16-41 EMDH16-65

(1) 20 x 24 x 1 (fiber glass) (1) 16 x 25 x 1 & (1) 14 x 25 x 1 (fiber glass)

EMDH16M-41 EMDH16M-65

(1) 8 x 24 x 1 (aluminum mesh) (1) 8 x 28 x 1 (aluminum mesh)

RTD9-65

FD9-65SRT16-65

23H13 23H14

24H61Furnished - Factory Installed

GEDH16-65 (use with EMDH16 or EMDHM16)18H70 (1/2")

•• Furnished as standard.Consists of: factory installed controls wiring harness, high pressure switch, loss of charge switch, low voltage terminal strip and compressor crankcase heater.




SPECIFICATIONS - CHP16 COMMERCIAL UNITS

Indoor

Outdoor

Indoor

Outdoor

OptionalElectric

HeatRatings

ECH16R-5

ECH16R-7

ECH16R-10

ECH16-15

Output Btuh

•A.F.U.E.Output Btuh

•A.F.U.E.

Output Btuh


•A.F.U.E.

19,00099.0%

26,00099.0%36,000

99.0%

53,000

99.0%

27,00099.0%37,000

99.0%

54,000

99.0%

ECH16R-10

ECH16-15

Output Btuh


•A.F.U.E.

70,000

99.0%

71,000

99.0%

88,000

99.0%

27,00099.0%37,000

99.0%

54,000

99.0%71,000

99.0%

88,000

99.0%-----

-----

-----

-----

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Page 5

ELECTRICAL DATA

Line Voltage Data � 60Hz. - 1ph

Model No.

Compressor

Condenser

Fan Motor

EvaporatorBlower

•Recommended Max. Fuse Size (amps)Unit Power Factor

Rated Load Amps

Locked Rotor Amps

Full Load Amps

Locked Rotor Amps

Full Load Amps

Locked Rotor Amps

CHP16H�261 CHP16H�311

CHP16�413 CHP16�513 CHP16�653

Line Voltage Data � 60Hz. - 3ph

Model No.

Compressor

Condenser

Fan Motor

EvaporatorBlower

•Recommended Max. Fuse Size (amps)

Unit Power Factor

Rated Load Amps

Locked Rotor Amps

Full Load Amps

Locked Rotor Amps

Full Load Amps

Locked Rotor Amps

Combustion Air Blower - FLA

Combustion Air Blower - FLA

208/230v 208/230v

208/230v 208/230v 208/230v460v 460v 460v

12.1 13.5

57.0 77.4

.09 .90

1.5 1.5

2.1 2.1

4.6 4.6

0.75 0.75

30 30

19.0 20.0

11.3 5.2 15.4 8.4 17.7 9.4

66.0 35 90 45 105 55

1.1 0.70 2.3 1.1 2.3 1.1

2.2 1.3 4.4 2.0 4.4 2.0

3.0 1.8 3.9 1.8 4.6 1.8

6.2 4.4 8.3 4.4 10.0 3.8

0.75 0.75 0.60 0.60

25 15 40 20 45 20

.86 .87 .88 .88 .89 .89

•Where current does not exceed 60 amps, HACR circuit breaker may be used in place of fuse.

NOTE - Extremes of operating range are plus and minus 10% of line voltage.

*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements.

*Minimum Circuit Ampacity

.99 .95

*Minimum Circuit Ampacity 19.0 9.0 26.0 14.0 30.0 15.0

CHP16H-261-311 AND CHP16(R)-411-511-651 MODELS SINGLE PHASE VOLTAGE

CHP16(R)-411

208/230v

17.9

83.5

1.1

2.2

3.0

6.2

0.75

40

27.0

.95

CHP16(R) -651

208/230v

27.6

135.0

2.3

4.4

4.6

10.0

0.75

60

42.0

.97

CHP16(R)-511

208/230v

23.4

118.0

2.3

4.4

3.9

8.3

0.75

50

36.0

.92

CHP16-413-513-653 MODELS THREE PHASE VOLTAGE

ACCESSORY AIR RESISTANCE

Unit

Model

No.

Air

Volume

(cfm)

REMD16 DownflowEconomizer

Total Resistance (inches water gauge)

EMDH16EconomizerDownflow

*RDE16-41Duct

Enclosure

DF16 Downflow Filter Adaptor Kit

CHA16H-261

CHA16H-311

800

1000

1200

CHA16-410

800

1000

1200

1400

CHA16-510

CHA16-650

1600

1800

2000

2200

.15

.18

.21

.15

.18

.21

.25

.20

.23

.27

.32

---

---

---

.18

.26

.35

.46

.30

.35

.40

.47

.11

.19

.22

---

---

---

---

---

---

---

---

---

---

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.15

.18

.21

.25

.15

.17

.20

.23

With1" Filter

WithoutFilter

With1" Filter

WithoutFilter

.05

.06

.09

.05

.06

.09

.15

.05

.06

.08

.10

---

---

---

.10

.15

.21

.29

.17

.19

.22

.26

*Air resistance is with air filter in place.NOTEElectric heaters have no appreciable air resistance.

◊WithPleated2" Filter

WithFiberglass

2" Filter

With1" Filter

WetEvaporator

Coil

.27

.34

.42

.40

.48

.56

.66

.25

.29

.36

.47

.36

.41

.47

.54

---

---

---

---

---

.51

---

---

---

.27

.34

.42

.51

.35

.42

.49

.57

---

---

---

.13

.18

.24

.31

.22

.27

.32

.37

.08

.09

.10

.08

.09

.10

.11

.09

.10

.11

.12

◊WithPleated2" Filter

WithFiberglass

2" Filter

◊Air resistance is with pleated non�woven cotton fabric filter.

---

Page 6

DIFFUSER AIR RESISTANCE

UnitModelNumber

AirVolume(cfm)

RTD9-65 Diffuser

2 EndsOpen

1 Side2 EndsOpen

All Ends& SidesOpen

FD9-65Diffus�

er

CHP16H�261

CHP16H�311

CHP16�410

CHP16�510

CHP16�650

800

1000

1200

800

1000

1200

1400

1600

1800

2000

2200

.15

.19

.25

.15

.19

.25

.33

.43

.56

.73

.95

.13

.16

.20

.13

.16

.20

.26

.32

.40

.50

.63

.11

.14

.17

.11

.14

.17

.20

.24

.30

.36

.44

.11

.14

.17

.11

.14

.17

.20

.24

.30

.36

.44

CHP16H-261 BLOWER PERFORMANCE @ 230 VOLTS(With Horizontal Supply and Return Air Openings)

External Static Air Volume (cfm) @ Various Speeds

Pressure(in. wg) High Med-High Med-Low Low

0 1235 990 860 685

.05 1210 975 855 680

.10 1180 955 845 675

.15 1155 940 840 670

.20 1130 920 830 665

.25 1105 900 825 660

.30 1075 880 815 655

.40 1010 840 785 640

.50 940 790 740 610

.60 860 730 665 535

.70 770 660 580 415

.75 720 620 535 330NOTE- All cfm data is measured external to unit.

CHP16(R)-411-413 BLOWER PERFORMANCE @ 230VOLTS(With Horizontal Supply and Return Air Openings)



0 1360 1270 1070 890

.05 1355 1250 1060 885

.10 1350 1230 1050 880

.15 1330 1220 1035 870

.20 1310 1210 1020 860

.25 1295 1190 1005 845

.30 1280 1170 990 830

.40 1230 1130 960 800

.50 1170 1070 910 760

.60 1100 990 850 700

.70 1020 890 780 620





0 2075 1675 1445 1275

.05 2060 1660 1440 1270

.10 2040 1645 1435 1270

.15 2020 1635 1435 1265

.20 1995 1620 1425 1260

.25 1965 1600 1415 1250

.30 1940 1580 1405 1240

.40 1880 1545 1375 1220

.50 1815 1500 1335 1195

.60 1740 1450 1280 1165

.70 1655 1395 1210 1130


CHP16H-311 BLOWER PERFORMANCE @ 230 VOLTS(With Horizontal Supply and Return Air Openings)



0 1500 1060 900 720

.05 1450 1045 890 715

.10 1400 1030 880 710

.15 1360 1020 870 705

.20 1320 1010 860 705

.25 1285 1000 850 700

.30 1250 985 840 695

.40 1190 945 810 670

.50 1110 900 765 620

.60 1040 840 720 565

.70 980 765 650 505


CHP16(R)-411-413 BLOWER PERFORMANCE @ 230VOLTS(With Downflow Supply and Return Air Openings)



0 1360 1270 1070 890

.05 1355 1250 1060 885

.10 1350 1230 1050 880

.15 1330 1220 1035 870

.20 1310 1210 1020 860

.25 1295 1190 1005 845

.30 1280 1170 990 830

.40 1230 1130 960 800

.50 1170 1070 910 760

.60 1100 990 850 700

.70 1020 890 780 620


Page 7




0 2015 1610 1425 1240

.05 2000 1595 1420 1235

.10 1980 1580 1415 1235

.15 1960 1575 1415 1230

.20 1935 1560 1405 1225

.25 1910 1540 1395 1215

.30 1885 1520 1385 1205

.40 1825 1485 1355 1185

.50 1760 1445 1315 1160

.60 1690 1395 1260 1130

.70 1615 1335 1190 1095




Pressure(in. wg) HighMed-High

MediumMed-Low

Low

0 2570 2220 2000 1780 1510

.05 2560 2210 1990 1780 1520

.10 2540 2200 1980 1770 1530

.15 2520 2190 1970 1770 1520

.20 2500 2180 1960 1760 1510

.25 2480 2160 1940 1750 1510

.30 2440 2140 1920 1740 1500

.40 2390 2100 1900 1710 1470

.50 2320 2060 1860 1670 1440

.60 2240 2010 1810 1630 1400

.70 2160 1950 1760 1580 1350

.75 2120 1920 1720 1560 1330

NOTE- All cfm data is measured external to unit.



Pressure(in. wg) HighMed-High

MediumMed-Low

Low

0 2450 2200 1990 1760 1460

.05 2430 2180 1980 1750 1470

.10 2410 2170 1970 1740 1490

.15 2390 2160 1960 1730 1500

.20 2360 2140 1950 1720 1490

.25 2340 2120 1930 1710 1490

.30 2320 2100 1910 1700 1480

.40 2270 2060 1880 1670 1470

.50 2230 2010 1830 1640 1430

.60 2170 1930 1780 1600 1390

.70 2120 1890 1730 1550 1340

.75 2080 1850 1700 1530 1310


CHP16-413 BLOWER PERFORMANCE @ 460/575 VOLTS(With Horizontal Supply and Return Air Openings)

External Static Air Volume @ Various Speeds

Pressure (in. wg) High Medium Low

0 1665 1490 1080

.05 1640 1465 1080

.10 1610 1440 1080

.15 1585 1420 1075

.20 1555 1400 1070

.25 1525 1380 1060

.30 1495 1355 1050

.40 1435 1300 1015

.50 1365 1250 985

.60 1295 1180 935

.70 1205 1100 860

.75 1145 1060 800


CHP16-513 BLOWER PERFORMANCE @ 460/575 VOLTS(With Horizontal supply and Return Air Openings)



0 2090 1755 1115

.05 2065 1740 1115

.10 2035 1720 1110

.15 2005 1705 1110

.20 1975 1685 1105

.25 1950 1675 1100

.30 1920 1650 1095

.40 1860 1600 1080

.50 1790 1555 1055

.60 1720 1495 1020

.70 1640 1425 975

.75 1595 1385 945


CHP16-653 BLOWER PERFOFMANCE @ 460/575 VOLTS(With Horizontal Supply and Return Air Openings)



0 2570 2100 1760

.05 2560 2090 1770

.10 2540 2070 1760

.15 2520 2050 1760

.20 2500 2030 1750

.25 2480 2010 1740

.30 2440 2000 1720

.40 2390 1960 1670

.50 2320 1910 1620

.60 2240 1870 1550

.70 2160 1800 1490

.75 2120 1760 1470


Page 8

CHP16-413 BLOWER PERFORMANCE @ 460/575 VOLTS(With Downflow Supply and Return Air Openings)



0 1560 1380 1070

.05 1555 1355 1075

.10 1540 1330 1080

.15 1510 1320 1070

.20 1475 1315 1060

.25 1450 1295 1040

.30 1430 1270 1025

.40 1360 1215 980

.50 1280 1145 925

.60 1185 1045 850

.70 1070 925 750

.75 990 860 680





0 2075 1650 1105

.05 2045 1635 1105

.10 2015 1625 1100

.15 1980 1615 1100

.20 1945 1600 1095

.25 1915 1585 1090

.30 1880 1570 1085

.40 1810 1535 1070

.50 1735 1490 1045

.60 1650 1430 1010

.70 1555 1355 965

.75 1500 1310 935





0 2450 2090 1740

.05 2430 2080 1740

.10 2410 2060 1730

.15 2390 2040 1720

.20 2360 2020 1710

.25 2340 2000 1700

.30 2320 1990 1680

.40 2270 1940 1630

.50 2230 1880 1590

.60 2170 1840 1520

.70 2120 1770 1460

.75 2080 1740 1440


FIGURE 1

CHP16H PARTS ARRANGEMENT

COMPRESSOR

DRAIN

CONTROLBOX

OPTIONALELECTRIC HEAT

SUPPLY

INDOOR COIL

BLOWER

RETURN

CONTACTOR

OUTDOOR FAN

CHP16-410 AND CHP16-510/650PARTS ARRANGEMENT

OUTDOORCOIL

COMPRESSOR

CONTROL BOX

OPTIONALELECTRIC

HEAT

INDOORCOIL

BLOWER

RETURN

OPTIONALSUPPLY

OPTIONALRETURN

SUPPLY

SUPPLY

Page 9

I-APPLICATION

CHP16 2-5 ton units are available in three model and three

cabinet sizes (refer to the Engineering Handbook for more

specific application data). CHP16H models are available

only in the smallest cabinet and are applicable for residen�

tial installations with horizontal supply and discharge air

only. CHP16H units are single�phase only and are not

equipped for installation of Lennox' optional thermostat

control systems. CHP16R models are residential only units

available in both the small and large convertible (downflow

or horizontal) cabinets. CHP16R models, like the CHP16H

models, are single�phase only and are not equipped for

installation of Lennox' optional thermostat control sys�

tems. CHP16 models are residential or commercial units

available in single or three�phase and available in both the

small and large convertible (downflow or horizontal) cabi�

nets. CHP16 (commercial) models are factory equipped

with the hardware required for installing Lennox' optional

thermostat control systems. Lennox' optional thermostat

control systems are the same controls, harnesses, and

harness plugs used in all 16 series commercial air condi�

tioners, heat pumps and gas/electrics. For example, a

Honeywell W973 control will plug in to a CHP16-411 as

easily as it will plug in to a CHP16-1853 (and no field wiring

is required).

All units are equipped for single�stage cooling and single�

stage heating. Up to two stages of heating are available if

optional electric heat unit is installed and up to two stages

of cooling are available if optional economizer is installed.

II-UNIT COMPONENTS

CHP16 unit components are shown in figures 1.

A-Control Box Components

CHP16H control box is shown in figure 2. The control box is

adjacent to the compressor compartment behind the elec�

tric heat access panel.

CHP16R and CHP16 control boxes are shown in figures 3

through 6. In all units, the control box is located in the heat�

ing compartment behind the heating compartment access

panel. The outdoor fan can be accessed by removing the

fan grill located on top of the unit.

The indoor blower access panel (all units) is located on the

opposite side of the unit from the heating compartment ac�

cess. Figure 1 shows typical blower compartment access.

CHP16H CONTROL BOX

T1 TRANSFORMER

K3 BLOWER RELAY

WIRINGGROMMET

C1 CAPACITOR

C5 CAPACITOR

ELECTRICHEAT SECTION

FIGURE 2

CONTACTOR K1

DEFROST RELAY K4

OUTDOORFAN

RELAY K10

DEFROST CONTROLCMC1

POTENTIAL RELAY K31

FUSE F1

Page 10

FIGURE 3

CHP16R-411 CONTROL BOX COMPONENTS

WIRING GROMMET

T1TRANSFORMER

K3BLOWER RELAY

ELECTRICHEAT

SECTION

K1 COMPRESSORCONTACTOR

C1 CAPACITOR

F1 FUSE

DEFROST CONTROL CMC1

POTENTIAL RELAY K31

DEFROST RELAY K4

DEFROSTRELAY K10

C7 CAPACITOR

FIGURE 4

CHP16-411/413 CONTROL BOX COMPONENTS

TB1TERMINAL

BOARD

K3 BLOWERRELAY


T1 TRANSFORMER

T4 AUTO TRANSFORMER(CHP16-413-1J only)

WIRING GROMMET

ELECTRICHEAT SECTION

F1FUSE

DEFROST RELAY K4

DEFROST RELAY K10

TRANSFER RELAY K8

LATCH RELAY K6

POTENTIAL RELAY K31

C7 CAPACITOR

C12 DUAL CAPACITOR(�411 Units)

C1 FAN CAPACITOR(�413 UNITS)

CHP16R-511/651 CONTROL BOX

FIGURE 5

WIRING GROMMET

T1 TRANSFORMER

K31 POTENTIALRELAY

K3 BLOWERRELAY


C12 DUAL CAPACITOR

C7 STARTCAPACITOR

ELECTRIC HEATSECTION

F1 FUSE

DEFROST RELAY K4

DEFROST RELAY K10


FIGURE 7

BLUE

YELLOW

ORANGE

RED

BLACK

240 VOLTS

208 VOLTS

PRIMARY SECONDARY

208 / 230 VOLTTRANSFORMER

Page 11

CHP16-511/513/651/653 CONTROL BOX

FIGURE 6

WIRING GROMMET

T1 TRANSFORMER

K31 POTENTIALRELAY

CHP16-511/651 units only

C7 START CAPACI�TOR

CHP16-511/651units only

T4AUTO TRANSFORMER

(CHP16-513/653-575v only)

TB1 TERMINAL BOARD

K3 BLOWER RELAY


C12 DUAL CAPACITOR(CHP16-511/651 only)

C1 CAPACITOR(CHP16-513/653 only)

OR

LOCATION FORP AND Y VOLTAGE

LOCATION FORG AND J VOLTAGE

F1 FUSE


DEFROST RELAYK4

DEFROSTRELAY K10

TRANSFER RELAY K8

LATCH RELAY K6

1-Transformer T1

CHP16 series units use a

single line voltage to 24VAC

transformer located in the

control box. The transformer

supplies power to control cir�

cuits in the unit. Transformers

are rated

as shown in table 1. P volt�

age (208/230V) transform�

ers have two primary voltage

taps (figure 7) which allow

the unit to be installed in accordance with local power sup�

ply voltage.

2-Transformer Fuse F1

Transformers in all units are equipped with an integral fuse

connected in series with the blue secondary voltage wire.

The fuse may be accessed outside the transformer and is

rated as shown in table 1.

Unit

T1 TRANSFORMER RATING

Primary SecondaryVA

RatingInternal

Fuse

CHP16H�261CHP16H�311CHP16R�411P/511P/651PCHP16R�413Y/513Y/653Y

208/230VAC

24VAC 70 3.5A

CHP16�413G/513G/653G 24VAC480VAC 70 3.5A

CHP16�413J/513J/653J 24VAC575VAC 70 3.5A

TABLE 1

3-Terminal Strip TB1

All CHP16 commercial units are equipped with a low volt�

age terminal strip (TB1). The strip is used for making up all

indoor thermostat and outdoor unit low voltage control wir�

ing connections (see figures 4 and 6). The terminal strip is

located at the bottom left corner of the control box.

4-Compressor Contactor K1

K1 is a 24V to line voltage contactor used to energize the

compressor and outdoor fan in response to thermostat

demand. Three�phase units use three�pole�double�break

contactors. Single�phase units use single�pole contac�

tors.

WARNINGElectric Shock Hazard.

Can cause injury or death.

Single�phase units are equipped with single�polecontactors. One leg of compressor, capacitor andoutdoor fan are always connected to line voltage.Turn off power at disconnect before servicing.

NOTE - Contactor K1 is energized by the thermostat

control system. Depending on the control system

installed, the contactor may or may not be immediately

energized upon demand. Refer to the operation se�

quence for the control system installed.

5-Indoor Blower Relay K3

208/230 volt units use a single DPDT relay to energize the

indoor blower motor. 460 volt and 575 volt units use a

single 3PDT relay. The blower relay in CHP16H and

CHP16R units operates somewhat differently from the

blower relay in commercial CHP16 units. Likewise, the

blower relay in 460V and 575V commercial units operates

somewhat differently from the blower relay in 208/230V

commercial units.

LATCH RELAY K6

1 4

5 6 8

9

10

12

13 14

FIGURE 8

SET

RESET

Page 12

CHP16H and CHP16R units use a heat pump thermostat.

The blower relay coil is energized directly by the thermo�

stat anytime there is a cooling or heating demand or when

the fan switch is in the �ON" position. When the coil is ener�

gized, a set of N.O. contacts closes to energize the blower

motor on high speed.

Commercial CHP16 units (single�phase and three�phase)

use a conventional 2 heat / 2 cool thermostat. Transfer

relay K8 is used to direct power to blower relay K3 depend�

ing on whether the unit is in cooling or heating mode. In

cooling mode transfer relay K8 is de�energized and blower

relay K3 is energized by thermostat terminal G through

K8�1 normally closed contacts. In heating mode transfer

relay K8 is energized and blower relay K3 is energized di�

rectly by transformer T1 through K8�1 normally open con�

tacts.

460 (G) and 575(J) voltage units use a unique blower mo�

tor which requires the 3PDT relay. The motor utilizes the

extra set of N.C. relay contacts to complete an internal cir�

cuit when the motor is on low or medium (heating) speed.

Refer to the blower motor section of this manual for more

information.

6-Defrost Relay K4

Relay K4 initiates defrost in response to demand. K4 is en�

ergized when defrost thermostat S6 closes and defrost

control CMC1 calls for defrost. Once energized, contacts

K4�1 open to reset the internal timer to zero, contacts K4�2

close to energize the electric heat (if installed) and K4�3

closes to energize defrost relay K10 and defrost pressure

switch S46.

Defrost can be terminated one of two ways. First, if both de�

frost pressure switch S46 and defrost thermostat S6 open

during defrost, relay K4 is de�energized and defrost is ter�

minated. Second, if one or both defrost switches remain

closed at the end of the 14 minute defrost period, the de�

frost control will terminate defrost by de�energizing K4.

7-Latch Relay K6

CHP16 commercial units are designed to use conventional

heat/cool thermostats and are equipped with latch relay

K6. Latch relay K6 is used in commercial heat pumps to

control operation of the reversing valves when a heat/cool

thermostat is used. CHP16H and CHP16R units are de�

signed to use heat pump thermostats and do not use latch

relay K6.

CHP16 series units are plumbed so that the unit is in cooling

mode when the reversing valve is energized. Latch relay K6

controls operation of the reversing valves and is controlled

(indirectly) by the indoor thermostat.

A latch relay (figure 8) is a special type of relay with two

coils; a �SET" coil and a �RESET" coil. When 24VAC is ap�

plied to the �SET" coil, the normally open contacts close

and the normally closed contacts open. When power is re�

moved from the �SET" coil, nothing happens; the N.O. con�

tacts remain closed and the N.C. contacts remain open.

The contacts do not return to their normal position until the

�RESET" coil is energized. Once the contacts are reset,

they remain in their normal position when power is re�

moved.

CHP16 series units use a

DPDT latch relay. One set of

normally open contacts is con�

nected in series with thermo�

stat Y1 and compressor con�

tactor K1 while the matching

normally closed contacts are

connected in series with ther�

mostat W1 and compressor

contactor K1. The other set of

normally open contacts is con�

nected in series with the re�

versing valve. When the

�SET" coil is energized (Y1),

the normally open contacts

close to energize the reversing

valve (thereby placing the unit

in cooling mode) and to ener�

gize the compressor contactor. When power is removed from

the �SET" coil (such as when cooling demand is satisfied), the

normally open contacts remain closed, the reversing valve re�

mains energized and the unit remains in cooling mode.

When a heating demand is initiated (W1), the �RESET" coil

is energized. The normally open contacts reopen and the

reversing valve is de�energized (thereby placing the unit in

the heating mode). The normally closed contacts then al�

low W1 to energize the compressor contactor. When heat

demand is satisfied and power to the �RESET" coil is re�

moved, the normally open contacts remain open, the nor�

mally closed contacts remain closed and the unit remains

in the heating mode.

8-Transfer Relay K8

The combined operation of latch relay K6 and transfer

relay K8 allow the CHP16 to use a conventional heat/cool

thermostat as opposed to a heat pump thermostat. Trans�

fer relay K8 switches thermostat blower demand from cool�

ing mode to heating mode. Relay K8 routes blower de�

mand from the appropriate thermostat output to the blower

relay depending on whether the unit is in cooling or heating

mode.

Page 13

During cooling mode, the blower relay receives power from

thermostat terminal G (relay K8 de�energized). During

heating demand transfer relay K8 is energized. When K8

is energized, power routing is switched so that the blower

relay receives power from heating thermostat demand

(W1).

9-Defrost Relay K10

K10 is energized only during defrost. It is responsible for de�

energizing outdoor fan B4 during defrost. In commercial

CHP16 units it is also responsible for energizing reversing

valve L1. When K10 is energized, K10�1 opens to de�ener�

gize outdoor fan B4 and K10�2 (commercial units only)

switches to energize the reversing valve.

10-Potential Relay K31

Relay K31 is used in all single�phase units and is located in

the control box. It is a potential relay which controls the op�

eration of the compressor starting circuit. The relay is normal�

ly closed when the compressor (contactor K1) is de-ener�

gized. Capacitor (C7) is connected to a set of normally

closed K31 contacts and assists the compressor in starting.

When K1 energizes, the compressor immediately begins

start�up. K31 remains de-energized during compressor

start-up and the start capacitor (C7) remains in the circuit. As

the compressor gains speed K31 is energized by electromo�

tive forces generated by the compressor. When K31 ener�

gizes, its contacts open to take the start capacitor out of the

circuit.

11-Start Capacitor C7

All single�phase units use a compressor start capacitor

(C7) connected in parallel with the run capacitor (C5). The

capacitor is energized during compressor startup and is

switched off by potential relay K31 when the compressor

nears full speed. Three�phase units do not use start ca�

pacitors. Table 2 shows start capacitor ratings for single�

phase CHP16s. The capacitor is mounted in the compres�

sor compartment. See figures 5 and 6 for capacitor loca�

tion.

The start capacitor uses a 15K ohm 2 watt �bleed" resistor

connected in parallel with the capacitor terminals. The re�

sistor is used to slowly discharge the capacitor when not in

use.

12-Dual Capacitor C12

Three, four and five ton single�phase units use permanent�

split�capacitor motors. A single �dual" capacitor is con�

nected to both the fan motor and the compressor. A dual

capacitor is two independent capacitors inside one can.

Each side of the capacitor has different ratings as shown in

table 3. The capacitor is located inside the compressor

compartment.

13-Compressor Run Capacitor C5

CHP16H�261 and CHP16H�311 units use separate com�

pressor run and outdoor fan capacitors. Compressor run

capacitor is shown in table 3.

Unit C7 Start Capacitor Rating

CHP16�411CHP16R�411

CHP16�511CHP16R�511

176 � 216 MFD.@ 320 VAC

135 � 155 MFD.@ 320 VAC

TABLE 2

CHP16H�261 88 � 108 MFD. @ 250 VAC

CHP16H�311 145 � 175 MFD. @ 330 VAC

CHP16�651CHP16R�651

176 � 216 MFD.@ 320 VAC

UnitKey

NumberType/

Rating

Run Capacitor Ratings

CHP16�511CHP16R�511

C12

Dual Capacitor40 mfd compressor7.5 mfd fan@ 440V

CHP16�651CHP16R�651

C12

Dual Capacitor45 mfd compressor7.5 mfd fan@ 440V

CHP16�411CHP16R�411

C12

Dual Capacitor40 mfd compressor5 mfd fan@ 370V

CHP16H�261CHP16H�311CHP16�413Y

C1Single Capacitor5 mfd fan@ 370V

C1Single Capacitor7 mfd fan@ 370V

TABLE 3

CHP16H�311 C5Single Capacitor35 mfd compressor@ 370V

CHP16H�261 C5Single Capacitor25 mfd compressor@ 370V

CHP16�513Y/653YCHP16�413G/513G/653GCHP16�413J/513J/653J

CHP16H�261CHP16H�311 C4

Single Capacitor7 mfd indoor blower@ 370V

CHP16�410 Series C4Single Capacitor5 mfd Indoor blower@ 370V



Page 14

14-Defrost Control CMC1

The CMC defrost control (figure 9) is a solid state control

which provides automatic switching from normal heating op�

eration to defrost mode and back. The control provides 14

minute defrost periods at 30, 60 or 90�minute field�changeable

intervals. Each control monitors thermostat demand and

�holds" the timer in place between thermostat demand. A set

of diagnostic pins are also provided for troubleshooting the re�

frigeration circuit.

The control contains a solid state timer which switches an ex�

ternal defrost relay through 1/4" male spades mounted on the

control's circuit board. The control energizes the defrost relay

at regular timed intervals. Defrost thermostat S6 initiates de�

frost and pressure switch S46 terminates defrost. If S46 does

not terminate defrost, CMC1 will terminate defrost after 10

minutes.

FIGURE 9

SOLID STATE DEFROST TIMERTIMING JUMPER

TIMING PINS

TROUBLESHOOTINGPINS

CONTROLTERMINALS

When the indoor thermostat closes (call for heat or cool), de�

frost timer initiates 30, 60 or 90�minute (depending on how

the control is preset) timing sequence. At the end of the tim�

ing sequence, the control attempts to energize the defrost

relay. If either defrost thermostat or defrost pressure switch

are closed when timing sequence ends, the defrost relay is

energized and defrost begins. Consequently, both defrost

switches must open in order for defrost to be terminated by

switches (defrost can also be terminated by the internal timer

of the defrost control).

Defrost Control Components

a- Timing Pins 30(T1), 60(T2), 90(T3)

Each of these pins provides different timed interval be�

tween defrosts. A jumper connects the pins to circuit

board pin W1. Table 4 shows the timings of each pin.

The defrost interval can be field changed to 30, 60 or

90 minutes. The defrost period (14 minutes) cannot be

changed. To change the interval between defrosts,

simply remove the jumper from the pin it is connected

to and reconnect the jumper to one of the other avail�

able pins (see figure 10).

FIGURE 10

NEEDLE-NOSE

PLIERS

TO CHANGE CONTROL TIMINGS:

1- Turn off all power to the unit to avoid damaging the circuit board. 2- Grasp wire connector firmly with needle nose pliers as shown. 3- Gently pull connector from pin. 4- Select new timing pin. DO NOT SELECT A �TST" PIN. 5- Gently push connector onto desired pin (see Table 4 for timings).

Connector is seated when pin snaps. 6- Turn on power to unit.

IMPORTANT

Prevent control damage. Do not connect timingjumper to either �TST" pin.

Prevent control damage. Avoid contact with othercontrol terminals or control components.

IMPORTANT

b- Timing Jumper

A timing jumper is factory installed on the circuit board

and is used to connect pin W1 to one of three timing

pins. The jumper may be connected to any one timing

pin but must never be connected to the �TST" pins.

See following Caution.

IMPORTANTPotential for control damage.

Do not connect timing jumper to �TST" pins.�TST" pins are used only during a test and mustnot connect with timing pins.

TABLE 4

DEFROST

CONTROL CMC

TIMINGS

INTERVAL BETWEEN

JUMPER CONNECTED TO:DEFROST

TIME30 (T1) 60 (T2) 90 (T3)

NORMAL

OPERATION

�TST" PINSJUMPERED

30 + 3 60 + 6 90 + 9 14 + 1.4

7 + 0.7 14 + 1.4 21 + 2.1 3.3 + 0.3

MIN. MIN. MIN. MIN.

SEC. SEC. SEC. SEC.TOGETHER

DEFROSTS WITH

c- �24V" Terminal

Terminal �24V" receives 24VAC from the control trans�

former. This terminal powers the control's internal tim�

er and relays. Terminal �24V" must be powered at all

times in order to provide �HOLD" between thermostat

demands.

Page 15

FIGURE 11

TO PLACE CONTROL IN TEST MODE:

1- Turn off all power to avoid damaging the circuit board. 2- Make sure all control terminals are connected as shown on unit

wiring diagram before attempting to place control in test mode.See NOTE below.

NOTE - Control will not go into test mode when discon�nected from unit. Unit load must be applied to control termi�nals before the control will go into test mode.

3- Connect jumper to �TST" pins as shown. 4- Turn indoor thermostat to heat mode and adjust to highest tempera�

ture setting. 5- Turn on power to unit. 6- See Table 4 for control timings in �TST" mode. 7- Be sure to turn off power and remove jumper when test is complete.

Turn on power and re-adjust thermostat.

IMPORTANT

Prevent control damage. Avoid contact with othercontrol terminals or control components.

d- �COM" Terminal

Terminal �COM" provides 24VAC common.

e- �HLD" Terminal

Terminal �HLD" holds an internal timer in place between

thermostat demands and allows the unit to continue

timing upon resumption of thermostat demand. When

thermostat demand is present, the control is allowed to

count down to the next defrost. Terminal �HLD" is con�

nected directly to thermostat demand.

f- �OUT" Terminal

Terminal �OUT" controls defrost when connected to

one side of the defrost relay coil. An internal relay con�

nected to terminal �OUT" closes (allowing an internal

path from �OUT" to �COM") to allow external defrost

relay to energize and initiate defrost. At the end of the

defrost period, the internal relay connected to terminal

�OUT" opens to de-energize the external defrost relay.

g- �RST" Terminal

Terminal �RST" resets the internal timer when power is re�

moved and begins timer operation when power is re�

turned. Terminal �RST" is connected to terminal �COM"

through a set of normally closed defrost relay contacts.

When the defrost relay contacts open terminal �RST"

loses power (the path through �RST" is disrupted) and in�

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉ

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉÉÉÉÉÉÉÉ

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉÉÉ

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ

ÉÉÉÉÉÉ

ÉÉÉÉÉÉ

CLOSED, ON

OPEN, OFF

THERMOSTAT DEMANDDEFROST THERMOSTAT

DEFROST RELAY

THERMOSTAT DEMAND

DEFROST THERMOSTATDEFROST RELAY

THERMOSTAT DEMANDDEFROST THERMOSTAT

DEFROST RELAY

THERMOSTAT DEMAND

DEFROST THERMOSTATDEFROST RELAY

CHP16 SERIES UNITS

TYPICAL DEFROST TIMINGS

NORMAL HEATING OPERATION:DEFROST TERMINATED BY DEFROST THERMOSTAT

NORMAL HEATING OPERATION:DEFROST TERMINATED BY TIME

NORMAL HEATING OPERATIONINTERRUPTED BY THERMOSTAT DEMAND: �HOLD" FUNCTION

DEFROST PERIOD INTERRUPTED BY THERMOSTAT DEMAND:�HOLD" FUNCTION

30/60/90 MINUTES

�HOLD" TIME

�HOLD" TIME

14 MIN PLUS �HOLD" TIME

30/60/90 MINUTES

DEFROST THERMOSTATOPEN WITHIN 14 MINUTES

30/60/90 MINUTES 14 MIN 30/60/90 MINUTES

30/60/90 MINUTES PLUS �HOLD" TIME

Note - Control begins timing at 0 when defrost thermostat closes. Defrost is terminated when defrost relay is de-energized. Anytimedefrost thermostat opens, defrost relay is immediately de-energized, defrost timer resets and �HOLD" function stops.

FIGURE 12

Page 16

ternal timer is reset. The control resumes timing when the

defrost relay contacts close.

h- �TST" Pins

Each board is equipped with a set of test pins for use in

troubleshooting the unit. When jumpered together, these

pins reduce the control timing to a fraction of the original

time (see table 4 and figure 11).

IMPORTANTPrevent control damage.

Control will begin test mode only if normal loadis applied to control terminals. Do not attemptto operate or test control out of unit.

A defrost period can last up to 14 minutes and can be termi�

nated two ways. First, if the defrost thermostat and defrost

pressure switch do not open within 14 minutes after defrost

begins, the internal timer (by opening the internal path from

�OUT" to �COM") will de-energize the defrost relay and the

unit will resume normal operation. Second, if the defrost

thermostat and defrost pressure switch both open during the

14 minute defrost period, the defrost relay is de-energized

and the unit resumes normal operation. Refer to figure 12.

B-Plumbing Components

Summary of Features

Cooling in commercial units (CHP16) may be supplemented

by field�installed economizer. CHP16H-261/311,

CHP16-411/413 and CHP16R-411 units use a single slab-

type enhanced fin indoor coil with rifled tubing and capillary

�cap" tubes as the primary expansion device (figure 15).

CHP16R-511/651 and CHP16-511/513/651/653 units use a

single slab-type enhanced fin indoor coil with rifled tubing and

a thermal expansion valve �TXV" as the primary expansion

device (figures 13 and 14). All units use enhanced fin out�

door coil with rifled tubing and a thermal expansion valve

�TXV" as the primary expansion device during heat pump

mode. All units are equipped with high pressure switch and

loss of charge switch. All -510/-650 units are equipped with

thermometer well for charging. All models use draw-through

type outdoor fans.

Page 17

PLUMBING COMPONENTSEXPANSION VALVE SYSTEMS

FIGURE 13

DISCHARGE LINE

INDOORCOIL

DEFROST THERMOSTAT S6

SUCTION LINE

HIGH PRESSURESWITCH

S4

OUTDOOR COIL

FILTER/DRIER

REVERSING VALVE

LIQUID LINE

VAPOR LINE

DISTRIBUTOR

EQUALIZER LINE

THERMOMETER WELL(-510 and -650 ONLY)

SENSING BULB

LOSS OF CHARGESWITCH S24

CAPILLARY TUBE

DEFROST PRESSURESWITCH S46

CHECK/EXPANSION VALVE

CHP16(R)-410 (shown)

3 Ton Systems

Page 18

PLUMBING COMPONENTSTHERMAL EXPANSION VALVE SYSTEMS

FIGURE 14

SUCTION LINE

HIGH PRESSURE AND LOSS OF CHARGE SWITCHES USED ON CHP16 UNITS ONLY.

CHP16(R)-510 (shown)

INDOOR COIL

DISCHARGE LINE


LOSS OF CHARGE SWITCHS24

FILTER/DRIER

REVERSING VALVE

LIQUID LINE

VAPOR LINE

DISTRIBUTOR

EQUALIZER LINE

THERMOMETER WELL(-510 and -650 ONLY) SENSING BULB

4 and 5 Ton Systems

ACCUMULATOR

OUTDOOR COILDEFROST THERMOSTAT S6


HIGH PRESSURE SWITCHS4

DETAILOF REVERSING VALVEPLUMBING ASSEMBLY

Page 19

PLUMBING COMPONENTSRFCIII SYSTEMS

CHP16H-261

CHP16H-311

INDOOR COIL

DISCHARGE LINE

DISCHARGE LINE

FIGURE 15

INDOOR COIL

OUTDOOR COIL

RFC IIIREFRIGERANT FLOW

CONTROL DEVICE

REVERSING VALVE

CHECK/EXPANSIONVALVE

FILTER/DRIER

COMPRESSOR

SENSING BULB

EQUALIZER LINE

DISTRIBUTOR


HIGH PRESSURESWITCH S4 SUCTION LINE

LIQUID LINE

VAPOR LINE

OUTDOOR COIL

EXPANSION VALVE CAPILLARY TUBE


FILTER/DRIER

DISTRIBUTOREXPANSION VALVE CAPILLARY TUBE

SENSING BULB

REVERSING VALVE

VAPOR LINE

RFC IIIREFRIGERANT FLOW

CONTROL DEVICELIQUID LINE

SUCTION LINE

COMPRESSOR


HIGH PRESSURESWITCH S4

EQUALIZER LINE

DEFROSTTHERMOSTAT S6

DEFROSTTHERMOSTAT S6

Page 20

TABLE 5

Unit

Locked

RotorAmps

Rated

LoadAmps

OilChargeFl. Oz.

CrankcaseHeaterPhase

CHP16 SERIES UNITS - COMPRESSOR SPECIFICATIONS

CHP16H-261

CHP16H-311

Voltage/

CHP16R-411

CHP16-411

CHP16-413-Y

CHP16-413-G

208/230/1

208/230/1

208/230/1

208/230/1

460/3

CHP16R-511

CHP16-511

208/230/3

208/230/1

208/230/1

CHP16-513�Y

CHP16-513�G

CHP16-513�J

208/230/3

460/3

575/3

CHP16R-651

CHP16-651

CHP16-653�Y

CHP16-653�G

CHP16-653�J

208/230/1

208/230/1

208/230/3

460/3

575/3

56.0

77.4

83.5

83.5

66.0

35.0

118.0

118.0

90.0

45.0

36.0

135.0

135.0

105.0

55.0

45.0

32

40

55

55

55

55

55

55

55

55

55

70

70

70

70

70

None

40 watt Insertion TypeSelf

Regulating


Regulating


Regulating

12.1

13.5

17.6

17.6

11.5

5.3

23.4

23.4

15.4

8.4

6.5

27.6

27.6

17.7

9.4

6.3

CHP16-413�J 575/3 35.0 555.3

45 watt Self Reg.

1-Compressor B1

Table 5 shows the specifications of compressors used in all

units. Compressors used in CHP16 commercial units are

equipped with insertion type crankcase heaters. All compres�

sors are protected by internal pressure relief valves and inter�

nal overload protection circuitry.

WARNINGElectric shock hazard.


Do not operate without protective cover overterminals. Disconnect power before removingprotective cover. Discharge capacitors beforeservicing unit.

2-High Pressure Limit S4

The high pressure limit is a manually reset SPST N.C.

switch which opens on a pressure rise. All units are

equipped with the limit. The switch is located in the com�

pressor discharge line and is wired in series with the com�

pressor contactor. When discharge pressure rises above

410+10 psig (indicating a problem in the system) the

switch opens and the compressor is de-energized (the

economizer continues to operate). After the problem has

been found and corrected, the switch can be reset by push�

ing the reset button.

3-Loss of Charge Switch S24

The loss of charge switch is an auto�reset SPST N.C.

switch which opens on a pressure drop. All commercial

units (CHP16) are equipped with the switch. CHP16R and

CHP16H are not equipped with the switch. The switch is

located in the compressor discharge line and is wired in se�

ries with the high pressure switch and compressor contac�

tor. When discharge pressure drops below 25+5 psig (indi�

cating a loss of charge in the system) the switch opens and

the compressor is de-energized. The switch automatically

resets when refrigerant is added and pressure in the dis�

charge line rises above 55+5 psig.

4-Defrost Thermostat S6

Defrost thermostat S6 works in conjunction with defrost

control CMC1 to initiate defrost. The switch is a SPST N.O.

thermostat located on the liquid line between the outdoor

coil distributor and the outdoor coil filter/drier. It remains

open during normal cooling and heating operation (to pre�

vent defrosting) and defrost timer CMC1 continues to ac�

cumulate time. When outdoor coil temperature drops be�

low 35°F + 4°F, the switch closes and the defrost circuit is

enabled (call for defrost). If S6 is closed when CMC1

checks for defrost (every 30, 60 or 90 minutes) then defrost

relay K4 is energized. S6 remains closed until liquid line

temperature rises above 60°F + 5°F.

Page 21

Defrost thermostat S6 is intended only to initiate defrost.

Pressure switch S46 is used to terminate defrost. Once

defrost starts, contacts K4�1 close to latch�in pressure

switch S46. Typically S6 will open before the end of the 14

minute defrost period leaving relay K4 energized through

defrost pressure switch S46.

5-Defrost Pressure Switch S46

Defrost pressure switch S46 is a SPST N.C. pressure

switch located in the compressor discharge line. During

cooling and heating operation, S46 remains closed. The

circuit through S46 is a latch circuit which is energized only

during defrost (by defrost relay K4).

The purpose of the latch circuit is to ensure thorough de�

frost by forcing defrost relay K4 to terminate only when S46

is satisfied. When discharge (head) pressure during de�

frost rises above 275psi + 10psi the switch opens. At

275psi, the condensing temperature of HCFC�22 refriger�

ant is approximately 125°F. Head pressure builds rapidly

due to the outdoor fan being disabled during defrost. By the

time head pressure is elevated to 275psi, the condensing

temperature is elevated to the point that the outdoor coil is

defrosted.

If S6 and S46 both open during defrost, defrost is termi�

nated (K4 is de�energized). S46 automatically resets

(closes) when the unit resumes heating operation and dis�

charge (head) pressure drops below 195psi + 10psi.

6-Outdoor Coil

All CHP16s have a single outdoor coil. Each coil has two

rows (CHP16-511/513 and CHP16R-511 have 1-3/4 rows)

of copper tubes fitted with ripple-edged aluminum en�

hanced fins. A check and expansion valve feed multiple

parallel circuits through the coil.

7-Indoor Coil

All CHP16s have a single slab evaporator coil. The coil has

three rows of rifled copper tubes fitted with ripple-edged

aluminum fins. A check and expansion device feed multi�

ple parallel circuits through the coil.

a-RFCIII Flow Control Device

CHP16H-261, CHP16H-311, CHP16-411/413 and

CHP16R-411 units use RFCIII refrigerant flow control

device as the primary expansion device in the indoor

coil (figure 17). RFCIII is an orifice type expansion de�

vice (figure 16) which allows refrigerant flow in both di�

rections. Expansion takes place in a distributor which

then feeds independent parallel circuits through the

coil. See figure 18.

RFCIII components are shown in figure 17. Refrigerant

flows through the RFCIII in both cooling and heating

modes. During cooling mode, refrigerant flow front�

seats the orifice forcing liquid refrigerant to pass

through the center of the orifice. The orifice restricts re�

frigerant flow facilitating expansion. As the liquid exits

the orifice into the distributor, it expands and evapo�

rates. During heating mode, refrigerant flow back�

seats the orifice. When the orifice is back�seated, re�

frigerant flow is allowed to pass around and through the

orifice unrestricted.

A screen�type strainer in the liquid line connector pro�

hibits debris from entering the orifice chamber during

cooling mode. If the refrigerant system is opened for

service, the liquid line connector should be removed

and the strainer cleaned.

The inside diameter of the orifice is critical for proper

RFCIII operation. The orifice is sized specifically to the

CHP16 unit. Table 6 shows the orifice inside diameter

(i.d.) required for each unit. Orifice i.d. is stamped on

the outside of the orifice as shown in figure 16.

FIGURE 16

065

RFCIII ORIFICEINSIDE DIAMETER

Inside Diameter (i.d.).065 inches

Inside Diameter IsStamped On Outside

Of Orifice.

TABLE 6

UnitExpansion

Device

Orifice i.d.

inches

CHP16H�261

CHP16R�411CHP16�411/413

ALL OTHER UNITSExpansion

Valve Removed

RFCIII

RFCIII

RFCIII

.059

.065

.071

Orifice

CHP16H�311

Page 22

ÉÉÉÉÉÉÉÉÉÉ


ÇÇÇÇÇÇÇÇÇÇÇÇ






RFCIII REFRIGERANT FLOWCONTROL DEVICE

COOLING MODE

HEATING MODE

Orifice Front-SeatedRefrigerant Flows Through

Center Opening Only

Orifice Back-SeatedRefrigerant Flows Around Orifice

And Through Center Opening

Distributor

Connector/Strainer

Liquid LineConnector

Connector/Strainer

Distributor

Liquid LineConnector

Liquid Line

Liquid Line

Strainer

Strainer

FIGURE 17

FIGURE 18

END VIEW

INDOOR COIL PLUMBINGCHP16H-261, CHP16H-311,

CHP16-411/413 and CHP16R-411

LIQUID LINE

VAPOR LINE

DISTRIBUTOR

INDOOR COIL

RFCIIIEXPANSION

DEVICE

b-Expansion Valve

CHP16 -510 through -650 series units use a Thermal

Expansion Valve (TXV) as the primary expansion de�

vice on the indoor coil. See figure 19. FIGURE 19

EVAPORATOR PLUMBINGCHP16-511/513, CHP16-651/653CHP16R-511 and CHP16R-651

INDOORCOIL

CHECK ANDEXPANSION

VALVE FED BYLIQUID LINE

VAPORLINE

SENSINGBULB STRAPPEDTO SUCTION LINE

FEEDER TUBES

DISTRIBUTOR

EQUALIZERLINE

LIQUIDLINE

CHECKVALVE

FIGURE 20

THERMOMETER WELL

THERMOMETERWELL

LIQUID LINEGAUGE PORT

LIQUID LINE

Page 23

8-Thermometer Well (Figure 20)

All CHP16-510/650 series

units are factory equipped

with a thermometer well for

charging the unit. The well is

used to accurately measure

the temperature of the liquid

line. The temperature mea�

sured is then used to calcu�

late the approach or subcool�

ing temperature. Approach

and subcooling temperatures are compared to tables

printed in the charging section of this manual to determine

the correct charge. Thermometer wells are equipped with

a gauge port for connection of high pressure gauge.

To accurately measure liquid line temperature, the well

should be filled with a light mineral oil before using. This

ensures good heat transfer to the thermometer.

C-Outdoor Fan and Indoor Blower

1-Outdoor Fan and Motor B4

The specifications tables on pages 2, 3 and 4 in this manu�

al show the specifications of outdoor fans used in CHP16s.

The outdoor fan in all units is controlled by compressor

contactor K1.

2-Outdoor Fan Capacitor C1

All units use single�phase permanent�split�capacitor out�

door fan motors which require a run capacitor for efficient

operation. Refer to table 3 for a listing of capacitor ratings

and a list of units which use C1. C1 is located in the com�

pressor compartment. The outdoor fan in three, four and

five ton single�phase CHP16 and CHP16R units use a

dual capacitor C12 instead of C1. The dual capacitor is

shared between the compressor and the outdoor fan.

3-Blower Motor B3

All CHP16 series units use single�phase PSC blower mo�

tors. A single run capacitor is mounted on the blower hous�

ing. All motors use multiple speed taps. Typically, the high

speed tap is energized during compressor operation and a

lower speed tap is energized during heating operation.

4-Blower Motor Capacitor C4

All CHP16 208/230v units use single�phase PSC motors.

The run capacitor is mounted on the blower housing. Ca�

pacitor ratings are shown in table 3.

460v and 575v units use single�phase PSC 460v blower mo�

tors. The capacitor is located on the blower housing.

Blower motors in CHP16 -261, -311, -411 and -511 units

have four speed taps. Motors in CHP16-651 units have

five speed taps. All G (460V) and J (575V) voltage units

have three taps. Blower motor specifications are listed in

table 7. Blower specifications are listed in the tables on

pages 2, 3 and 4.

A third (blue) tap on G (460V) and J (575V) volt motors is

used to complete an internal circuit during low or medium

speed operation. It must never be connected to line volt�

age. During low speed (red tap) operation, the high speed

(black) tap is disconnected from line voltage and is con�

nected to blue internal wiring tap. Internal wiring is shown

in figure 21.

TABLE 7BLOWER MOTOR - 1075 RPM - CCW ROTATION

UnitVolts

Phase HP FLA

CHP16H-261

CHP16H-311

CHP16-411/413 CHP16R-411

CHP16-511/513 CHP16R-511

CHP16-513

CHP16-651/653 CHP16R-651

CHP16-653

208/230

208/230

208/230

208/230

208/230

460

460

1

1

1

1

1

1

1

1/3

1/3

1/3

1/2

1/2

3/4

3/4

2.1

2.1

3.9

3.9

1.8

4.6

1.8

Motor

575

CHP16-413 460 1 1/2 1.8

CHP16-513 575 1 1/2 0.7

CHP16-653 1 3/4 0.7

FIGURE 21

ORANGE BLACK BLUE YELLOW RED

WINDING WINDING WINDINGHIGH SPEED MEDIUM SPEED LOW SPEED

460 VOLT BLOWER MOTOR WINDINGS

The motor has three sets of windings. The high speed winding is inde�pendent of the other two and the medium and low speed windings aretied together with a center tap. High speed is accomplished by ener�gizing the high speed windings. Medium speed is accomplished byconnecting the medium speed and high speed windings in series.Low speed is accomplished by connecting the low, medium and highspeed windings in series. Refer to unit wiring diagram and Corp.8909-L7.

IMPORTANTPotential for motor damage.

Do not isolate medium or low speed windingswhen operating at medium or low speed. The bluelead must never be connected to a power lead(blower demand from heat relay or blower relay) orto common.

Failure to connect the blue tap as shown on unitdiagram will cause improper operation, increasedcurrent flow and/or burnt windings.

Page 24

III-OPTIONAL ECH16 ELECTRIC HEAT

A-Matchups and Ratings

Tables 8, 9, 10, 11 and 12 show all possible CHP16 to

ECH16 matchups. Also shown in the tables are ECH16

electrical ratings.

B-Electric Heat Components

ECH16 parts arrangement is shown in figures 22, 23, 24,

25, 26, 27 and 28. All ECH16 units consist of electric heat�

ing elements exposed directly to the airstream. Elements

are sequenced on and off by heat relays or contactors in

response to thermostat demand.

1-Relay K15

Relay K15 is a single�pole single�throw relay located

on the control panel of all commercial single�phase

ECH16 units (15, 20 and 25 kW). K15 is equipped with

a 24VAC coil which is energized when pilot relay K43

closes. When K15 is energized, the first stage heating

elements are energized. (HE1 in ECH16�15; HE1 and

HE2 in ECH16�20 and ECH16�25).

2-Contactor K15

Contactor K15 is a three�pole double�break contactor

used in all commercial three�phase ECH16 units. K15

is equipped with a 24VAC coil which is energized when

pilot relay K43 closes. When K15 is energized, the first

stage heating elements are energized.

Contactor K15 used in ECH16�15�1Y and

ECH16�25�1G units is equipped with a set of auxiliary

single�pole double�throw contacts. The auxiliary con�

tacts are not used in this application.

3-Relay K16





closes. When K16 is energized, the second stage heat�

ing elements are energized (HE2 in ECH16�15; HE3

and HE4 in ECH16�20 and ECH16�25).

4-Contactor K16

Contactor K16 is a three�pole double�break contactor

used in commercial 20 and 25 kW three�phase ECH16

units. K16 is equipped with a 24VAC coil which is ener�

gized when time delay DL2 closes. When K16 is ener�

gized, the second stage heating elements are ener�

gized.

5-Relay K17





closes. When K17 is energized, the third stage heating

elements are energized (HE3 in ECH16�15; HE5 and

HE6 in ECH16�20 and ECH16�25).

6-Resistor R6

A resistor is used in parallel with the coil of heat relay

K32 in ECH16R�5 electric heaters. The resistor is rated

150 ohm + 10%, 10 watt.

The resistor reduces the effects of inrush current on the

thermostat. Heat relay K32 draws approximately 0.7

amps immediately after being energized. As the relay

coil heats, the current subsides. Within a few seconds

after being energized, the current is reduced to mini�

mum level (approximately 0.18

amps).

Contactor K16 used in ECH16�25�1Y unit is equipped

with a set of auxiliary single�pole double�throw con�

tacts. The auxiliary contacts are not used in this ap�

plication.

7-Relay K43

Relay K43 is a double�pole double�throw pilot relay

used in all commercial ECH16 units. The relay uses a

24VAC coil which is energized by thermostat demand.

The coil is wired in series with the primary high temper�

ature limit S15. If an overtemperature condition be�

comes present, pilot relay K43 is immediately de�ener�

gized and electric heat operation immediately

stops.

When relay K43 is energized, normally open contacts

K43�1 and K43�2 close. When K43�1 closes, contactor

K15 (and time delay DL2 if so equipped) are energized

to begin electric heat operation. When K43�2 closes,

the indoor blower begins operating on heating speed.

Page 25

TABLE 8

CHP16�261 & CHP16�311 ELECTRIC HEAT DATA

Optional Single Point Power Source Boxes

SinglePackage

UnitModel No.

ElectricHeater

Model No.& Net Weight

No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input

ElectricHeatBtuhInput

Heater Sub�Fuse BoxModel No.

Unit Sub�Fuse BoxModel No.

Total Unit &Electric Heat

*MinimumCircuit

Ampacity

208 22.5 3.7 12,600 40.0

ECH16R�5 1 step 220 23.9 4.2 14,300 ECH16R� ECH16�261 41.4

(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41�5 42.4

240 26.0 5.0 17,100 43.5

208 31.6 5.3 18,100 49.1


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65�7 52.5

CHP16H�261 240 36.5 7.0 23,900 54.0

208 45.1 7.5 25,600 62.6


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65�10 67.5

240 52.1 10.0 34,100 69.6

208 67.8 11.3 38,600 85.3

ECH16�15 1 step 220 71.6 12.6 43,000 � � � � ECH16�261 89.1

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 92.4

240 78.1 15.0 51,200 95.6

208 22.5 3.7 12,600 42.4


(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41�5 44.8

240 26.0 5.0 17,100 45.9

208 31.6 5.3 18,100 51.5


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65�7 54.9

CHP16�311 240 36.5 7.0 23,900 56.4

208 45.1 7.5 25,600 65.0

ECH16RR�10 1 step 220 47.8 8.4 28,700 ECH16R� ECH16�311 67.7

(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65�10 69.9

240 52.1 10.0 34,100 72.0

208 67.8 11.3 38,600 87.7

ECH16�15 1 step 220 71.6 12.6 43,000 � � � � ECH16�311 91.5

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 94.8

240 78.1 15.0 51,200 98.0

*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.

Page 26

TABLE 9

CHP16(R)�411�413 ELECTRIC HEAT DATA


SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

Elec�tric

HeatKw

Input





*Minimum CircuitAmpacity

208 22.5 3.7 12,600 49.0


(4 lbs.) (1 phase) 230 24.9 4.6 15,700 26/41�5 51.4

240 26.0 5.0 17,100 52.5

208 31.6 5.3 18,100 58.1


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65�7 61.5

240 36.5 7.0 23,900 63.0

208 45.1 7.5 25,600 71.6


CHP16�411 (5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65�10 76.5

CHP16R�411 240 52.1 10.0 34,100 78.6

208 67.8 11.3 38,600 94.3

ECH16�15 1 step 220 71.6 12.6 43,000 � � � � ECH16�411 98.3

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 101.4

240 78.1 15.0 51,200 104.6

208 90.3 15.0 51,200 116.8

ECH16�20 1 step 220 95.5 16.8 57,300 � � � � ECH16�411 122.0

(19 lbs.) (1 phase) 230 99.8 18.4 62,800 126.3

240 104.1 20.0 68,300 130.6

208 13.0 3.7 12,600 31.2

ECH16�5 1 step 220 13.8 4.2 14,300 � � � � ECH16�413 32.0

(17 lbs.) (3 phase) 230 14.4 4.6 15,700 32.6

240 15.0 5.0 17,100 33.2

208 18.3 5.3 18,100 36.5

220 19.3 5.9 20,100 � � � � ECH16�413 37.5

230 20.1 6.4 21,800 38.3

ECH16�7 1 step 240 21.0 7.0 23,900 39.2

(17 lbs.) (3 phase) 440 9.6 5.8 19,800 18.4

460 10.1 6.5 22,200 � � � � ECH16�413 18.9

480 10.5 7.0 23,900 19.3

208 26.1 7.5 25,600 44.3

220 27.6 8.4 28,700 � � � � ECH16�413 45.8

230 28.9 9.2 31,400 47.1

CHP16�413 ECH16�10 1 step 240 30.1 10.0 34,100 48.3

(17 lbs.) (3 phase) 440 13.8 8.4 28,700 22.6

460 14.4 9.2 31,400 � � � � ECH16�413 23.2

480 15.0 10.0 34,100 23.8

208 39.1 11.3 38,600 57.3

220 41.4 12.6 43,000 � � � � ECH16�413 59.6

230 43.2 13.8 47,100 61.4

ECH16�15 1 step 240 45.1 15.0 51,200 63.3

(20 lbs.) (3 phase) 440 20.6 12.6 43,000 29.4

460 21.6 13.8 47,100 � � � � ECH16�413 30.4

480 22.5 15.0 51,200 31.3

208 52.1 15.0 51,200 70.3

220 55.1 16.8 57,300 � � � � ECH16�413 73.3

230 57.6 18.4 62,800 75.8

ECH16�20 2 steps 240 60.1 20.0 68,300 78.3

(20 lbs.) (3 phase) 440 27.6 16.8 57,300 36.4

460 28.9 18.4 62,800 � � � � ECH16�413 37.7

480 30.1 20.0 68,300 38.9


Page 27

TABLE 10

CHP16(R)�511/651 ELECTRIC HEAT DATA


SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input





*MinimumCircuit

Ampacity

208 31.6 5.3 18,100 67.1


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65�7 70.5

240 36.5 7.0 23,900 72.0

208 45.1 7.5 25,600 80.6


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65�10 85.5

240 52.1 10.0 34,100 87.6

CHP16�511 208 67.8 11.3 38,600 103.3

CHP16R�511 ECH16R�15 1 step 220 71.6 12.6 43,000 � � � � ECH16�511 107.1

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 110.4

240 78.1 15.0 51,200 113.6

208 90.3 15.0 51,200 125.8

ECH16�20 1 step 220 95.5 16.8 57,300 � � � � ECH16�511 131.0

(19 lbs.) (1 phase) 230 99.8 18.4 62,800 135.3

240 104.1 20.0 68,300 139.6

208 112.9 18.8 64,200 148.4

ECH16�25 1 step 220 119.4 21.0 71,700 � � � � ECH16�511 154.9

(19 lbs.) (1 phase) 230 124.9 23.0 78,500 160.4

240 130.3 25.0 85,300 165.8

208 31.6 5.3 18,100 73.0


(5 lbs.) (1 phase) 230 35.0 6.4 21,800 26/65�7 76.4

240 36.5 7.0 23,900 77.9

208 45.1 7.5 25,600 86.5


(5 lbs.) (1 phase) 230 50.0 9.2 31,400 26/65�10 91.4

240 52.1 10.0 34,100 93.5

CHP16�651 208 67.8 11.3 38,600 109.2

CHP16R�651 ECH16R�15 1 step 220 71.6 12.6 43,000 � � � � ECH16�651 113.0

(18 lbs.) (1 phase) 230 74.9 13.8 47,100 116.3

240 78.1 15.0 51,200 119.5

208 90.3 15.0 51,200 131.7

ECH16�20 1 step 220 95.5 16.8 57,300 � � � � ECH16�651 136.9

(19 lbs.) (1 phase) 230 99.8 18.4 62,800 141.2

240 104.1 20.0 68,300 145.5

208 112.9 18.8 64,200 154.3

ECH16�25 1 step 220 119.4 21.0 71,700 � � � � ECH16�651 160.8

(19 lbs.) (1 phase) 230 124.9 23.0 78,500 166.3

240 130.3 25.0 85,300 171.7


Page 28

TABLE 11

CHP16�513 ELECTRIC HEAT DATA

Optional Single Point Power Source

SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input




*MinimumCircuit

Ampacity

208 18.3 5.3 18,100 43.8

220 19.3 5.9 20,100 ECH16�513 44.8

230 20.1 6.4 21,800 45.6

240 21.0 7.0 23,900 46.5

ECH16�7 1 step 440 9.6 5.8 19,800 23.0

(17 lbs.) (3 phase) 460 10.1 6.5 22,200 ECH16�513/653 23.5

480 10.5 7.0 23,900 23.9

550 7.6 5.8 19,800 18.6

575 8.0 6.4 21,800 ECH16�413/513 19.0

600 8.4 7.0 23,900 19.4

208 26.1 7.5 25,600 51.6

220 27.6 8.4 28,700 ECH16�513 53.1

230 28.9 9.2 31,400 54.4

240 30.1 10.0 34,100 55.6

ECH16�10 1 step 440 13.8 8.4 28,700 27.2

(17 lbs.) (3 phase) 460 14.4 9.2 31,400 ECH16�513/653 27.8

480 15.0 10.0 34,100 28.4

550 11.0 8.4 28,700 22.0

575 11.5 9.2 31,400 ECH16�413/513 22.5

600 12.0 10.0 34,100 23.0

208 39.1 11.3 38,600 64.6

220 41.4 12.6 43,000 ECH16�513 66.9

230 43.2 13.8 47,100 68.7

CHP16�513 240 45.1 15.0 51,200 70.6

ECH16�15 1 step 440 20.6 12.6 43,000 34.0

(17 lbs.) (3 phase) 460 21.6 13.8 47,100 ECH16�513/653 35.0

480 22.5 15.0 51,200 35.9

550 16.5 12.6 43,000 27.5

575 17.3 13.7 46,800 ECH16�413/513 28.3

600 18.0 15.0 51,200 29.0

208 52.1 15.0 51,200 77.6

220 55.1 16.8 57,300 ECH16�513 80.6

230 57.6 18.4 62,800 83.1

240 60.1 20.0 68,300 85.6

ECH16�20 2 step 440 27.6 16.8 57,300 41.0

(20 lbs.) (3 phase) 460 28.9 18.4 62,800 ECH16�513/653 42.3

480 30.1 20.0 68,300 43.5

550 22.0 16.8 57,300 33.0

575 23.0 18.3 62,400 ECH16�413/513 34.0

600 24.0 20.0 68,300 35.0

208 65.1 18.8 64,200 90.6

220 68.9 21.0 71,700 ECH16�513 94.4

230 72.0 22.9 78,100 97.5

240 75.1 25.0 85,300 100.6

ECH16�25 2 steps 440 34.5 21.0 71,700 47.9

(20 lbs.) (3 phase) 460 36.0 22.9 78,100 ECH16�513/653 49.4

480 37.6 25.0 85,300 51.0

550 27.6 21.1 72,000 38.6

575 28.9 23.0 78,500 ECH16�413/513 38.9

600 30.1 25.0 85,300 41.1


Page 29

TABLE 12

CHP16�653 ELECTRIC HEAT DATA

Optional Single Point Power Source

SinglePackage

UnitModel No.

ElectricHeater


No. ofSteps &Phase

VoltsInput

Heater Only*Minimum

CircuitAmpacity

ElectricHeatKw

Input




*MinimumCircuit

Ampacity

208 18.3 5.3 18,100 47.3

220 19.3 5.9 20,100 ECH16�653 48.3

230 20.1 6.4 21,800 49.1

240 21.0 7.0 23,900 50.0

ECH16�7 1 step 440 9.6 5.8 19,800 24.3

(17 lbs.) (3 phase) 460 10.1 6.5 22,200 ECH16�513/653 24.8

480 10.5 7.0 23,900 25.2

550 7.6 5.8 19,800 18.4

575 8.0 6.4 21,800 ECH16�653 18.8

600 8.4 7.0 23,900 19.2

208 26.1 7.5 25,600 55.1

220 27.6 8.4 28,700 ECH16�513 56.6

230 28.9 9.2 31,400 57.9

240 30.1 10.0 34,100 59.1

ECH16�10 1 step 440 13.8 8.4 28,700 28.5

(17 lbs.) (3 phase) 460 14.4 9.2 31,400 ECH16�513/653 29.12

480 15.0 10.0 34,100 29.7

550 11.0 8.4 28,700 21.8

575 11.5 9.2 31,400 ECH16�653 22.3

600 12.0 10.0 34,100 22.8

208 39.1 11.3 38,600 68.1

220 41.4 12.6 43,000 ECH16�653 70.4

230 43.2 13.8 47,100 72.2

CHP16�653 240 45.1 15.0 51,200 74.1

ECH16�15 1 step 440 20.6 12.6 43,000 35.3

(17 lbs.) (3 phase) 460 21.6 13.8 47,100 ECH16�513/653 36.3

480 22.5 15.0 51,200 37.2

550 16.5 12.6 43,000 27.3

575 17.3 13.8 46,800 ECH16�653 28.1

600 18.0 15.0 51,200 28.8

208 52.1 15.0 51,200 81.1

220 55.1 16.8 57,300 ECH16�513 84.1

230 57.6 18.4 62,800 86.6

240 60.1 20.0 68,300 89.1

ECH16�20 2 step 440 27.6 16.8 57,300 42.3

(20 lbs.) (3 phase) 460 28.9 18.4 62,800 ECH16�513/653 43.6

480 30.1 20.0 68,300 44.8

550 22.0 16.8 57,300 32.8

575 23.0 18.3 62,400 ECH16�653 33.8

600 24.0 20.0 68,300 34.8

208 65.1 18.8 64,200 94.1

220 68.9 21.0 71,700 ECH16�653 97.9

230 72.0 22.9 78,100 101.0

240 75.1 25.0 85,300 104.1

ECH16�25 2 steps 440 34.5 21.0 71,700 49.2

(20 lbs.) (3 phase) 460 36.0 22.9 78,100 ECH16�513/653 50.7

480 37.6 25.0 85,300 52.3

550 27.6 21.1 72,000 38.4

575 28.9 23.0 78,500 ECH16�653 39.7

600 30.1 25.0 85,300 40.9*Refer to National Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.

Page 30

PARTS ARRANGEMENT ECH16R�5/7/10�P

S15 S15 S15Primary Limit S15

Thermal (Heat)Relay K32

Secondary Limit F5

Primary Limit S15



Secondary Limit F5

FIGURE 22

5kW 7/10kW

PARTS ARRANGEMENT ECH16-15-P

S15

K17 K16 K15

K43S20

S20

S20

35A FUSE

60A FUSE

Primary Limit S15

Secondary Limit S20

FIGURE 23

Electric Heat Relay K15



Pilot Relay K43

Current Limiting Fuses F3


Page 31

K17 K16 K15

K43

S15

S15S20

S20

S20

PARTS ARRANGEMENT ECH16-20/25-P

Primary Limit S15

Secondary Limit S20

FIGURE 24




Pilot Relay K43



PARTS ARRANGEMENT ECH16-5/15-Y and ECH16-5/15-G,J

K15

K43

S15

S15S20

S20

S20

Primary Limit S15

Secondary Limit S20

FIGURE 25

Electric Heat Contactor K15

Pilot Relay K43


Page 32

PARTS ARRANGEMENT ECH16-20-Y

K15K43

K16

S15

S15

S20S20

S20 S20

DL2

Primary Limit S15

Secondary Limits S20

FIGURE 26

First StageElectric Heat Contactor K15

Pilot Relay K43


Second StageElectric Heat Contactor K16


Second Stage Delay DL2

K15K43

K16

DL2

S15

S15S20

S20 S20

S20 S20

60A FUSE

40A FUSE

PARTS ARRANGEMENT ECH16-25-Y

Primary Limit S15


First StageElectric Heat Contactor K15

Pilot Relay K43

Second StageCurrent Limiting Fuses F3

Second StageElectric Heat Contactor K16

Second StageCurrent Limiting Fuses F3

First Stage Delay DL2

FIGURE 27

FIGURE 29

TYPICALTHERMAL SEQUENCING

(HEAT) RELAY

M1

M2

H

H

Page 33

K15

K43

S15

S20S20

S20 S20

PARTS ARRANGEMENT ECH16-20/25-G,J

Primary Limit S15


Electric Heat Contactor K15

Pilot Relay K43


FIGURE 28

8-Thermal (Heat) Relay K32, K33

Thermal sequencing (heat) relays are used to energize

heating elements in all ECH16R electric heaters. A

heat relay is a normally open relay with a resistive ele�

ment for a coil and a bimetal disk actuating the con�

tacts. When the relay is energized, internal resistance

heats the bimetal disk causing the contacts to close.

When the relay is de�energized, the disk cools and the

contacts open.

A sequencing relay has

multiple contacts. Each

set of contacts is con�

nected to a separate bi�

metal disk. When the

relay is energized, in�

ternal resistance heats

the bimetal disks at dif�

ferent rates causing the

contacts to close at dif�

ferent times.

The contacts are calibrated to operate on a first on last

off basis. Some heat relays may have two resistive

coils; each with its own set of contacts. Although they

are physically attached, they operate as two indepen�

dent relays. Figure 29 shows a typical heat relay. Table

13 describes the heat relays used in ECH16 series

units.

FIGURE 30

PRIMARY LIMIT S15,SECONDARY LIMIT S20

Page 34

ECH16 UsageRelay / Operation

K32 K33

TWO TIMINGSCONTROL VOLTAGE

COIL

24VAC coil. Both sets of con�tacts close 1�110 after H�H is en�ergized and open 1�110 sec. af�ter H�H is de�energized. Termi�nals M1�M2 operate on a first onlast off basis.

ECH16R�5�PH H

M2

M4

M1

M3

TABLE 13

��

FOUR TIMINGSCONTROL VOLTAGE COIL

Acts as two independent con�trols. 24VAC coil. K32 controlsM1�M2 and M3�M4 contacts.K33 controls M5�M6 and M7�M8contacts. Contacts close 1�110after H�H is energized and open1�110 sec. after H�H is de�ener�gized. All contacts operate on afirst on last off basis.

ECH16R�7�P

H H

M2

M4

M1

M3

H H

M2

M4

M1

M3

ECH16R�7�P

ECH16R�10�P ECH16R�10�P

THERMAL (HEAT) RELAYS

9-Time Delay DL2

Time delay DL2 is an electronic single�pole single�

throw time delay relay used in commercial 20 and 25

kW three�phase ECH16 units. DL2 allows staging by

providing a timed interval between the first and second

sets of heating elements. DL2 is energized with con�

tactor K15 when pilot relay K43�1 closes. When the

delay coil is energized, its normally open contacts are

delayed 30 seconds (+20%) before closing. When the

delay coil is de�energized, its contacts are delayed one

second (+20%) before opening.

10-Fuse F3

F3 is a current limiting fuse connected in series with

each leg of electric heat. Fuses used in ECH16 series

units are shown in table 14.

ECH16 FUSE RATINGS

All fuses are dual element U.L. Class RK�5.

Unit Fuse F3Usage

ECH16�15�1P60.0A @ 250V HE(2) & HE(3)

HE=Heating Element

35.0A @ 250V HE(1)

Quantity

Two

Two

ECH16�20�1P 45.0A @ 250V SixHE(1), HE(2), HE(3),HE(4), HE(5), HE(6)

SixHE(1), HE(2), HE(3),HE(4), HE(5), HE(6)

60.0A @ 250VECH16�25�1P

Three HE(1), HE(2),HE(3)

20.0A @ 250VECH16�5�1Y


25.0A @ 250VECH16�7�1Y


40.0A @ 250VECH16�10�1Y


60.0A @ 250VECH16�15�1Y

SixHE(1), HE(2), HE(3),HE(4), HE(5), HE(6)

40.0A @ 250VECH16�20�1Y

ECH16�25�1Y60.0A @ 250V

40.0A @ 250V Three

Three

HE(1), HE(2),HE(3)HE(4), HE(5),HE(6)Three HE(1), HE(2),HE(3)

10.0A @ 600VECH16�7�1G,J


20.0A @ 600VECH16�10�1G


15.0A @ 600VECH16�10�1J


30.0A @ 600VECH16�15�1G


25.0A @ 600VECH16�15�1J

ThreeHE(1), HE(2), HE(3),HE(4), HE(5), HE(6)

40.0A @ 600VECH16�20�1G


30.0A @ 600VECH16�20�1J


50.0A @ 600VECH16�25�1G


40.0A @ 600VECH16�25�1J

TABLE 14

11-High Temperature Primary S15

S15 is the primary high temperature limit. It is located in

the electric heat unit immediately downstream from the

heating elements. S15 is a single�pole single�throw

normally closed thermostat. S15 ratings are shown in

table 15.

In ECH16R series

units, multiple S15

thermostats may be

used. One S15 ther�

mostat is wired in se�

ries with each heating

element. When S15

trips, some heating

elements may remain

operable.

FIGURE 31

THERMAL CUT�OFF

FUSE F5

Page 35

ECH16 PRIMARY TEMPERATURE LIMIT S15 RATINGS

All S15 thermostats are auto�reset type single�pole single�throw.

Unit Close on Fall

ECH16R�5�1P

Open on Rise

*Uses two thermostats; one connected to each heating element.

ECH16R�7�1P*ECH16R�10�1P*

ECH16R�15�1PECH16�15�1YECH16�20�1YECH16�7�1G,1JECH16�10�1G,1JECH16�15�1G,1JECH16�20�1G,1J

ECH16�20�1P

ECH16�25�1P

ECH16�5�1YECH16�7�1Y

ECH16�10�1Y

ECH16�25�1Y

ECH16�25�1GECH16�25�1J

150°F + 5°F 110°F + 7°F

140°F + 5°F 100°F + 6°F

135°F + 5°F 95°F + 6°F145°F + 5°F 105°F + 6°F

120°F + 5°F 100°F + 6°F

150°F + 5°F 115°F + 6°F155°F + 5°F 115°F + 7°F

160°F + 5°F 120°F + 6°F

TABLE 15

In ECH16 commercial units, only one S15 thermostat is

used. A single S15 thermostat is wired in series with

pilot relay K43. When S15 trips, all heating elements

are de�energized.

12-High Temperature Secondary S20

ECH16 commercial units use non�resettable thermo�

stats for secondary high temperature protection. One

switch is connected in series with each leg of the ele�

ment assembly. Each S20 thermostat is physically lo�

cated adjacent to the element it is protecting. S20 is a

single�pole single�throw normally closed thermostat.

The thermostat actuates at 185°F + 8°F on a tempera�

ture rise and cannot be reset. Once tripped, it must be

replaced.

13-High Temperature Secondary F5

ECH16R series units use

thermal cutoff fuses for sec�

ondary high temperature

protection. The fuses are

connected in series with

each heating element (fig�

ure 31). The fuses are ce�

ramic non�resettable fus�

ible links which must be re�

placed after being tripped. Each cutoff is preset to open

at 333°F + 3°F.

14-Heating Elements

ECH16 and ECH16R heating elements are composed

of helix wound nichrome wire heating elements which

are exposed directly to the airstream. Heating ele�

ments are energized directly by contactors or thermal

(heat) relays located on the control panel. Once ener�

gized, heat transfer to the airstream is instantaneous.

Overtemperature protection is provided by primary and

secondary high temperature limits. Overcurrent

protection (ECH16 commercial units only) is provided

by current limiting fuses. Heating elements used in

ECH16 and ECH16R units are shown in table 16.

Unit Total Watts

TABLE 16

ECH16�5�P

ECH16�7�P

ECH16�10�P

ECH16�15�P

ECH16�20�P

ECH16�25�P

ECH16�5�Y

ECH16�7�Y

ECH16�10�Y

ECH16�15�Y

5000 @ 240V

7000 @ 240V

10000 @ 240V

15000 @ 240V

20000 @ 240V

25000 @ 240V

5000 @ 240V

7000 @ 240V

10000 @ 240V

15000 @ 240V

1

2/ Parallel

2 / Parallel

3/ Parallel

3 / Parallel

3 / Parallel

3 / Delta

3 / Delta

3 / Delta

3 / Delta

Number of Elements/Arrangement

ECH16�20�Y

ECH16�25�Y

20000 @ 240V

25000 @ 240V

6 / Delta

6 / Delta

ECH16�7�G

ECH16�10�G

ECH16�15�G

7000 @ 480V

10000 @ 480V

15000 @ 480V

3 / Wye

3 / Wye

3 / Wye

ECH16�20�G

ECH16�25�G

20000 @ 480V

25000 @ 480V

6 / Wye

6 / Wye

ECH16�7�J

ECH16�10�J

ECH16�15�J

7000 @ 600V

10000 @ 600V

15000 @ 600V

3 / Wye

3 / Wye

3 / Wye

ECH16�20�J

ECH16�25�J

20000 @ 600V

25000 @ 600V

6 / Wye

6 / Wye

IV-PLACEMENT AND INSTALLATION

Make sure that the unit is installed in accordance with the

installation instructions and all applicable codes. See ac�

cessories section for conditions requiring use of the option�

al roof mounting frame (RMF16).

Page 36

V-ELECTRICAL CONNECTIONS

A-Power Supply

Refer to start�up directions and refer closely to the unit wir�

ing diagram when servicing. Refer to unit nameplate for

minimum circuit ampacity and maximum fuse size.

208/460/575 volt units are factory wired with orange wire

connected to control transformer primary. 230 volt units

are field wired with red wire connected to control transform�

er primary.

WARNINGElectric Shock Hazard.


Single�phase units are equipped with single�polecontactors. One leg of compressor, capacitor andcondenser fan are always connected to line volt�age. Turn off power at disconnect before servicing.

B-Field Wiring

Unit and optional control field wiring is shown in the unit

diagram section of this manual.

VI-STARTUP - OPERATION

A-Preliminary Checks

1- Make sure that the unit is installed in accordance with

installation instructions and applicable codes.

2- Inspect electrical wiring, both field and factory installed

for loose connections. Tighten as required.

3- Check to ensure that refrigerant lines are in good con�

dition and do not rub against the cabinet or other refrig�

erant lines.

4- Check voltage at the disconnect switch. Voltage must

be within the range listed on nameplate. If not, consult

the power company and have the voltage condition

corrected before starting the unit.

5- Recheck voltage with unit running. If power is not within

range listed on unit nameplate, stop unit and consult

power company. Check amperage of unit. Refer to unit

nameplate for correct running amps.

Page 37

B-Cooling Startup:

NOTE - The following is a generalized procedure and

does not apply to all thermostat control systems. Elec�

tronic and ramping thermostat control systems may op�

erate differently. Refer to operation sequence section of

this manual for more information.

1- Set fan switch to AUTO or ON and move the system

selection switch to COOL. Adjust the thermostat to a

setting far enough below room temperature to bring on

the compressor.

2- Close unit disconnect switch. Compressor will start

and cycle with demand.

3- Refrigerant circuit is charged with HCFC-22 refrigerant.

See unit rating plate for correct amount of charge.

4- Refer to Refrigeration System Service Checks section

for proper method to check refrigerant charge.

C-Heating Start�up:

Set room thermostat for proper heat or auto operation, if

switching subbase is used. Close disconnect switch and

position heat setpoint lever above room temperature. Re�

fer to CHP16 unit installation instructions sections for addi�

tional information on start-up operations and adjustments.

VII-REFRIGERATION SYSTEM

SERVICE CHECKS

The charge should be checked during start�up using the

method outlined below.

A-Gauge Manifold Attachment

Attach gauge manifold high pressure line to liquid line

gauge port on thermometer well. Attach gauge manifold

low pressure line to suction line service port.

NOTE - When unit is properly charged (whether by ap�

proach or subcooling method) liquid line pressure

should approximate those given in table 18.

B-Charging

It is not recommended that the system be charged below

60°F (15°C). If charging below 60°F is required or if the sys�

tem is completely void of refrigerant, the recommended and

most accurate method of charging is to weigh refrigerant

into unit according to amount shown on unit nameplate and

in the specifications table.

Unit Void of Refrigerant

1- Connect an upright HCFC-22 drum to the center port

of gauge manifold. Purge air from connecting line.

2- Start unit.

3- Open drum valve and charge a quantity of refrigerant

gas into the system through the compressor suction

port, then close refrigerant drum valve. Allow unit to

run for a few minutes to stabilize operating pressure.

Determine correct charge as follows.

If weighing facilities are not available or if the unit is just low

on charge, use the following charging procedures. The

CHP16H�261/311 and CHP16(R)�410 units all use the

subcooling charging method. The CHP16(R)�510/650

units use the approach method. Charging must be done in

the cooling mode. Operate unit and allow system pres�

sures to stabilize before and after each adjustment.

CHECKING CHARGE

(Subcooling Method)

CHP16H-261/311, CHP16-411/413

and CHP16R-411 ONLY

1- This method uses liquid line temperature to check unit

charge. Attach thermometer or sensing probe to liquid

line and make sure of good thermal contact between

sensor and liquid line.

2- Allow unit to run for at least five minutes to stabilize

pressures.

3- If ambient temperature is above 60°F (15°C), place

thermometer in well and read temperature.

4- Read liquid line pressure from gauge and convert to

condensing temperature using standard HCFC-22

temperature/pressure conversion chart (or conversion

scale on gauge).

5- The difference between the liquid line temperature

(from step 3) and the conversion temperature (from

step 4) is subcooling (subcooling = conversion tem�

perature minus liquid temperature). Subcooling tem�

perature should approximate the values given in table

17. Add refrigerant to increase subcooling and remove

refrigerant to reduce subcooling.

Page 38

MODEL NO.Subcooling °F at Various Ambient Temps.

75°F 85°F 95°F 105°F 115°F

CHP16R-411

65°F

CHP16H-311

CHP16H-261 14 14 14 13 13 11

14

17 17 16 14 14 12

1214151717

TABLE 17

CHP16-411/413 17 17 16 14 14 12

CHECKING CHARGE

(Approach Method)

CHP16-511/513 CHP16-651/653

CHP16R-511 and CHP16R-651 ONLY

1- This method uses a thermometer inserted in thermom�

eter well to check liquid temperature. Make sure well is

filled with oil before checking charge.

2- Check ambient (outdoor) temperature.

3- If ambient temperature is above 60°F (15°C), place

thermometer in well and read temperature.

IMPORTANTPotential for improper charging.

Can result in improper operation or componentfailure.

Use table 18 as a general guide for performingmaintenance checks. When unit is properlycharged (whether by approach or subcoolingmethod) line pressures should approximate thosegiven in table 18. Table 18 is not a procedure forcharging the system. Minor variations in thesepressures may be expected due to differences ininstallations. Significant deviations could meanthat the system is not properly charged or that aproblem exists with some component in the sys�tem. Used prudently, table 18 could serve as auseful service guide.

4- Approach temperature is the difference between am�

bient and liquid line temperatures (Approach = liquid

minus ambient). Approach temperature should be 4°F(2°C) for CHP16-511/513 and CHP16R-511 units. Ap�

proach temperature should be 9°F (5°C) for

CHP16-651/653 and CHP16R-651 units. Refrigerant

must be added to lower approach temperature. Re�

move refrigerant from system to increase approach

temperature.

VIII-INDOOR� BLOWER

OPERATION / ADJUSTMENT

A-Blower Operation

NOTE - The following is a generalized procedure and

does not apply to all thermostat control systems.

1- Blower operation is dependent on thermostat control

system option that has been installed in the CHP16.

Refer to �Control System Options" section for detailed

descriptions of blower operation.

2- Generally, blower operation is set at the thermostat

subbase fan switch. With the fan switch in the �ON"

position, the blower operates continuously. With the

fan switch in the �AUTO" position, the blower cycles

with demand (or, with some control systems, runs con�

tinuously while the heating or cooling circuits cycle).

3- In most cases, the blower and entire unit will be off

when the system switch is in the �OFF" position. The

only exception is immediately after a heating demand

until blower control switches off.

B-Determining Unit CFM

1- The following measurements must be made with a dry

indoor coil. Run the blower without the cooling de�

mand. Air filters must be in place when measurements

are taken.

2- Measure static pressure external to the unit (from sup�

ply to return).

To Measure Discharge Static Pressure:

a-Measure tap locations (figure 32).

NORMAL OPERATING PRESSURES

LIQ.+ 10

SUC.+ 5

85 °F 95 °F 105 °F

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

115 °F65 °FLIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

LIQ.+ 10

SUC.+ 5

PSIG PSIG

75 °F

CHP16H-261

CHP16H-311CHP16-411/413CHP16R-411

CHP16-511/513CHP16R-511CHP16-651/653CHP16R-651

MODEL NO.

TABLE 18

161

159

172

166

173

67

71

66

73

72

190

187

204

192

200

73

77

72

74

73

221

218

235

223

235

78

81

77

76

81

258

252

272

256

268

85

84

82

78

83

287

288

302

290

300

87

86

84

80

80

323

326

338

328

333

90

87

87

81

78

STATIC PRESSURETAP LOCATIONS

MANOMETER

UNIT

TABLE 19

FOUR SPEED BLOWER MOTOR

Speed Tap Number

Low

Medium-Low

Medium-High

High

Common

5

4

3

2

1

TABLE 20FIVE SPEED BLOWER MOTOR

Speed Tap Number

Low

Medium-Low

Medium-HighHigh

Common

6

5

32

1

Medium 4

Page 39

b-Punch a 1/4" diameter hole. Insert manometer hose

flush with the inside edge of

hole or insulation. Seal

around hole with Perma�

gum. Connect the zero end

of the manometer to the

discharge (supply) side of

the system. Connect other

end of manometer to the

return duct as above.

c-With only the blower motor running, observe the ma�

nometer reading.

d-Seal around the hole when check is complete.

3- The CFM can be adjusted by changing the motor

speed taps. Follow the blower speed change instruc�

tions below.

C-Blower Speed Adjustment

208v/230v ONLY

Blower speed selection is accomplished by changing taps

in the connector at the blower motor (see figure 33). Facto�

ry blower speeds are shown in table 21.

All -261, -311, -411 and

-413 units (208/230V only)

have four speed leadless

blower motors. Speed

ports are arranged as

shown in table 19.

All -511, -513, -651 and -653

units (208/230V only) have

five speed leadless blower

motors. Blower speeds are

changed at harness connec�

tor ports as shown in table 20

.

TABLE 21

Unit

208v/230v FACTORY SET BLOWER SPEED

Cool (port)Heat(port)

High (2)

Med-Hi (3)

Low (5)

208v 230v

-261

-311

-411-50

-411-100

-413-50

-413-100

-511

-513

-651-75

-651-125

-653-75

-653-125

High (2)

High (2)

High (2)

Med-Hi (3)

Med-Hi (3)

Med-Hi (3) Med-Hi (3)

Med-Lo (4)

Med-Lo (4)

Medium (4) Med-Lo (4) Medium (4)

Med-Hi (3)

Med-Hi (3)

Medium (4)

Medium (4)

Med-Lo (5)

Med-Lo (5)

Med-Hi (3)

Med-Hi (3) Med-Hi (3)

Med-Lo (4) Low (5)

Med-Lo (4)

Medium (4) Med-Lo (5) Medium (4)

Med-Hi (3)

Med-Hi (3)

Medium (4)

Medium (4)

Med-Lo (5)

Med-Lo (5)

Each motor port in a leadless motor (figure 33) is analogous

to speed taps (pigtails) used in previous Lennox units. Each

motor is capable of four or five different speeds depending on

unit (refer to unit wiring diagram).

Each unit is factory wired to provide a single cooling speed

and a single heating speed. The speeds can be changed

by moving the cooling wire or the heating wire to a different

port at the harness connector.

Heating Speed:

Factory blower speeds are listed in a table on the unit wiring

diagram. Adjust the blower heating speed for proper air tem�

perature rise (listed on unit rating plate). To measure tempera�

ture rise, place thermometers in the supply and return air ple�

nums. Turn up thermostat to start the unit. After plenum ther�

mometers have reached their highest and most steady read�

ings, subtract thermometer readings. The difference should be

in the range listed on unit rating plate. If this temperature is

high, wire the blower to a higher speed; if resulting tempera�

ture is too low, wire the blower to a slower speed. Repeat this

procedure until desired temperature rise is obtained.

BLOWER SPEED TAP SELECTION208/230V UNITS

UNITHARNESS CONNECTOR

DISCONNECT HARNESS PLUG. DEPRESS TAB TO RE�LEASE WIRE CONNECTOR. SELECT NEW SPEED PORT.INSERT WIRE UNTIL CONNECTOR CLICKS IN PLACE.RE�

CONNECT HARNESS PLUG.

BLOWER MOTOR

TAB

PORT

MOTOR HARNESSCONNECTOR PORTS

FIGURE 33

1

2

3

4

5

6

TABLE 22460/575V BLOWER MOTOR

Speed Tap Color

LowMedium

HighInternal Circuit

Common

RedYellow

BlackBlue

Orange

Page 40

Cooling Speed:

Factory blower speeds are listed in a table on the unit wir�

ing diagram. Blower performance tables are listed in the

first section of this manual. Section �VIII-B-Determining

Unit CFM" shows how to measure discharge static pres�

sure. Once discharge static pressure has been deter�

mined, compare the value to blower performance tables

listed in the first section of this manual. If CFM is low, wire

the blower to a higher speed; if CFM is high, wire the blower

to a lower speed. Repeat this procedure until desired CFM

is reached.

D-Blower Speed Adjustment

460V and 575V Units

Late Production ONLY

All 460V and 575V units

have three speed blower

motors with pigtail leads

(taps). The taps are ar�

ranged as shown in table

22. Both 460V and 575V

units use a 460V PSC single phase blower motors. 575V

units use a step-down transformer in the unit control box to

provide 460V to the motor.

The motor is equipped with speed leads (taps) for changing

motor speed. The taps are connected to harness plug P38

along with line voltage wires from blower relay. Jumper J38 is

used to complete the circuit to the blower motor and provide

the proper heating and cooling speed. J38 is also used to pro�

vide the necessary �blue leg" circuit which 460V motors re�

quire (refer to figure 34 for more information). Blower speed

selection is accomplished by changing the harness jumpers

in the harness connector at the blower motor (see figure 34).

FIGURE 34

BLOWER SPEED TAP SELECTION460V and 575V UNITS

P38

J38

Three J38 jumpers are provided with the unit. Each is markedwith different speeds. To change blower speeds, disconnect the

installed J38 jumper and install one of the other J38 jumpers.

BLOWER

BLOWERMOTOR

Three J38 jumpers are provided with the unit. Each pro�

vides the speeds marked on the jack (Hi-Cool/Lo-Heat,

Med-Cool/Med-Heat or Hi-Cool/Med-Heat) and the �blue

leg" circuit referred to in figure 35.

Black-high

K3-2K3-2

Red-low

Blue

ElectricHeat Relay

460 VOLTAGE BLOWER MOTOR

NOTE-The blue tap on 460 voltage motors is not a speed tap. It is

used to complete an internal circuit when operating in medium or

low speed. This switching is accomplished by blower relay K3. DO

NOT CONNECT THE BLUE TAP TO LINE VOLTAGE OR MO�

TOR DAMAGE WILL RESULT.

FIGURE 35

Yellow�med

Orange-common

K3 = COOLING BLOWER RELAY

NOTE� This is a gen�eralized diagram. Unitjackplugs are notshown.

2

8

L3

5

L1

K3-3

B3

6 9 9

K43-2

3

Use the steps outlined in the previous section (Blower

Speed Adjustment 208V/230V Only) to determine which

J38 jumper to use.

CAUTIONPotential for damage to 460V and 575V blower mo�tors and/or unit electrical circuits.

The blue blower motor lead must never be con�nected to a line voltage power lead (blower de�mand from heat relay or blower relay). Refer tounit wiring diagram for proper wiring.

Can result in improper operation, increased cur�rent flow and/or burnt windings.

E-Blower Speed Adjustment

460V and 575V Units

Early Production ONLY

Early production units use the same 460V blower motor but

are not equipped with the J38/P38 jackplug for changing

blower speeds. Blower motor wires are routed back to the

unit control box where the wires end in pigtails. Blower mo�

tor speed can then be changed by rearranging the pigtail

connections.

Page 41

FIGURE 36

CHP16 460V BLOWER COMPART�MENT

EARLY PRODUCTION UNITS

J43/P43 JACKPLUG

DO NOT CHANGESPEED TAPS

HERE

CHANGE SPEEDTAPS

AT PIGTAILS LO�CATED

IN CONTROL BOX

FIGURE 37

CHP16 460V CONTROL BOXEARLY PRODUCTION UNITS

YellowMedium

RedLow

BlackHigh

BlueInternal Circuit

OrangeCommon

SPEED TAP CHANGES ARE MADE IN THE CONTROL BOX.

UNIT IS FACTORY WIRED FOR HIGH SPEED COOLING(BLACK MOTOR WIRE TO BLACK UNIT WIRE) AND LOWSPEED HEATING (YELLOW MOTOR WIRE TO YELLOWUNIT WIRE). RED (LOW SPEED TAP) IS NOT USED.

TO CHANGE BLOWER SPEEDS,REFER TO FIGURES 40, 38 and 39.

IMPORTANTPotential for unit damage.

Although 460V units are equipped with a threespeed blower motor, units are not designed or ap�proved for low speed blower operation. Lowspeed (red) tap should never be connected.

Can result in excessive heat exchanger tempera�ture rise resulting in component damage.

FIGURE 38

1 2 4 3 5

FIELD CHANGE OF BLOWER SPEED TAPS TOHIGH SPEED COOLING/HIGH SPEED HEAT�

INGWinding Winding Winding

High Speed Medium Speed Low Speed

OrangeCommon

BlackHigh

RedLow

BlueYellow

Medium

OrangeCommon

K3-2Blower Relay

K3-3Blower Relay

Electric HeatRelayK43�2

YellowMedium

Blue

BlackHigh

J43/P43

28

5

3

9

L1L3

J2/P2-7

J2/P2-9

9

6

FIGURE 39

1 4 32

FIELD CHANGE OF BLOWER SPEED TAPS TOMEDIUM SPEED COOLING

and MEDIUM SPEED HEATING

5

Winding Winding Winding

High Speed Medium Speed Low Speed

OrangeCommon

BlackHigh

RedLow

BlueYellow

Medium

K3-2Blower Relay

K3-3Blower Relay


YellowMedium

Blue

BlackHigh

J43/P43

2

5

8

9

3

L1L3

OrangeCommon

J2/P2-7

J2/P2-9

9

6

Page 42

FIGURE 40

OrangeCommon

BlackHigh

BlueYellowMedium

RedLow

Winding Winding WindingHigh Speed Medium Speed Low Speed

1 2 4 3 5

K3-2Blower Relay

FIELD CHANGE OF BLOWER SPEED TAPS TOHIGH SPEED COOLING/MEDIUM SPEED HEATING

J43/P43

OrangeCommon

BlackHigh

BlueYellow

Medium

K3-3Blower Relay


9

7

J2/P28

5

2

9

3

L1L3

9

6

IX-MAINTENANCE

WARNINGElectric shock hazard.


Turn off electrical power to unit before performingmaintenance or service operation on the unit.

WARNINGSharp metallic edges.

Be careful when servicing unit to avoid accidentalcontact with sharp metallic edges which may re�sult in personal injury.

A-LubricationSupply Air Motor Bearings - Bearings are prelubricated;

no further lubrication is required.

Condenser Motor Bearings-Bearings are prelubricated for

extended life. No further lubrication is needed.

B-Filters

CHP16 units require field provided field installed filters. Fil�

ters should be installed in the return air duct. A filter kit is

available for downflow discharge applications. Filters

should be checked monthly (or more frequently in severe

use) and cleaned or replaced regularly. Take note of "AIR

FLOW DIRECTION" marking on filter frame when re-

installing.

NOTE - In Canada, filters must be U.L.C. certified or

equivalent.

C-ECH16 and ECH16R Series Electric Heat

ECH16 and ECH16R electric heaters are used as auxiliary

heat for CHP16 series units. Heating elements and fuses

should be inspected yearly. If cracked or broken elements

are found, the element should be replaced. See Lennox Re�

pair parts for electric heat coil replacement.

D-Indoor Coil

1 - Clean coil, if necessary.

2 - Check connecting lines and coil for oil leaks.

3 - Check condensate drain pan and line, if necessary.

E-Outdoor Coil

1 - Clean and inspect condenser coil. (May be flushed

with a water hose.)

2 - Visually inspect connecting lines and coils for evi�

dence of oil leaks.

NOTE - If owner complains of insufficient cooling, the unit

should be gauged and refrigerant charge checked. Refer

to Gauge Manifold Attachment, Checking Charge and

Charging sections in this instruction.

F-Electrical

1 - Check all wiring for loose connections.

2 - Check for correct voltage at unit (unit operating).

3 - Check amp-draw on both condenser fan motor and

blower motor.

Fan Motor Rating Plate ____ Actual ________

Indoor Blower Motor Rating Plate____ Actual____

X-ELECTRICAL CONNECTIONS

A-Power Supply

Refer to start up directions and refer to unit wiring diagram

when servicing. Refer to unit nameplate for minimum cir�

cuit ampacity and maximum fuse size. 208/460/575 volt

units are wired with red wire connecting transformer T1 pri�

mary to L1. 230 volt units use orange wire connecting

transformer T1 primary to L1.

XI-ACCESSORIES

This section describes the application of most of the op�

tional accessories which can be connected to the CHP16.

Some of the accessories (for example, the Warm Up Con�

trol Kit) are described in the operation sequence section of

this manual.

FIGURE 41

LIFTING LUG KIT RMF16MOUNTING FRAME

Page 43

A-Lifting Lugs

Optional lifting lugs consists of

four brackets like that shown in

figure 41. Brackets are used to

lift unit during installation or

when servicing. Lugs are factory

furnished and field installed in

commercial units and are option�

al field installed in residential

units. Lifting lugs can be re�

moved from unit and reused.

A tethered pin is inserted in the bracket and through a hole

in base channel of unit. The pin is used only to hold bracket

in place; it does not support any weight. The bracket bot�

tom lip supports the weight of the unit.

Unit Maximum Unit Weight

CHA16H-261/311-50/75

CHA16-411/413-50/100CHA16R-411-50/100

CHA16-511/513/651/653-125 CHA16-651/653-75

CHA16R-511/651-125CHA16R-511-75

380 Lbs.

500 Lbs.

650 Lbs.

TABLE 23

If unit must be lifted for service, use only lifting lugs and

cables with spreader bars to lift unit. Table 23 shows maxi�

mum unit weight. Figure 42 shows how to rig the unit for lift�

ing. To prevent cabinet damage never use chains for lifting

unit.

UNIT

MOUNTINGBRACKETSFOR LIFTING

SPREADER BARS

RIGGING UNIT FOR LIFTING

FIGURE 42

Lifting Point ShouldBe Directly AboveCenter Of Gravity.

B-RMF16 Mounting Frame

When installing a CHA16 unit

on a combustible surface for

downflow discharge applica�

tions, RMF16 roof mounting

(figure 43) frame is required.

Otherwise, the RMF16 is rec�

ommended but not required.

The CHA16, if not mounted

on a flat (roof) surface, MUST

be supported under all edges and under the middle of the

unit to prevent sagging. The CHA16 MUST be mounted

level within 1/16" per linear foot in any direction.

The assembled RMF16 mounting frame is shown in figure

43. Refer to the RMF16 installation instructions for details

of proper assembly and mounting. The roof mounting

frame MUST be squared to the roof before mounting. Ple�

num system MUST be installed before the unit is set on the

mounting frame. Refer to the RMF16 installation instruc�

tions for proper plenum construction.

FIGURE 44

TYPICAL FIELD FABRICATEDMOUNTING FRAME

UNIT

MOUNTINGFRAME

Many types of roof framing or supports can be used to

mount the CHP16 unit, depending upon different roof

structures. A typical field fabricated roof mounting frame is

shown in figure 44.

Page 44

ACCESS COVER

REMD16M PARTS ARRANGEMENT

FIGURE 45

REMD16 PARTS ARRANGEMENT

ENTHALPY CONTROL

ACCESS COVER

REMOTEMOUNTING BASE

DAMPER MOTOR

ENTHALPY CONTROL

DAMPER MOTORMIXED AIR

SENSOR CONTROL

MIXED AIRSENSING BULBNOTE - Mixed air sensor and sens�

ing bulb are shown as they are fac�tory installed in a REMD16-41.REMD16-65 is similar. Mixed airsensor should be removed fromeconomizer and installed in unitblower compartment and sensingbulb should be installed in supply airstream as shown in figure 51.

OUTDOOR AIR DAMPERS

RETURN AIR DAMPERS

MIXED AIRSENSOR

NOTE - Mixed air sensor is shown as itis factory installed in a REMD16M-41.REMD16M-65 is similar. Mixed air sen�sor should be removed from economizerand installed in supply air stream asshown in figure 51.

Page 45

EMDH16M PARTS ARRANGEMENT

FIGURE 46

EMDH16 PARTS ARRANGEMENT

ACCESS COVERREMOVED

ENTHALPY CONTROLon REMOTE

MOUNTING BASE

DAMPER MOTOR

ENTHALPY CONTROLMIXED AIR

SENSOR CONTROLMIXED AIR

SENSING BULB

NOTE - Mixed air sensor andsensing bulb are shown as theyare factory installed in aEMDH16-41. EMDH16-65 is simi�lar. Mixed air sensor should be re�moved from economizer andinstalled in unit blower compart�ment and sensing bulb should beinstalled in supply air stream asshown in figure 51.

OUTDOOR AIR DAMPERS

RETURN AIR DAMPERS

ENTHALPY SENSOR

ENTHALPY SENSOR

ACCESS COVERREMOVED

OUTDOOR AIR DAMPERS

RETURN AIR DAMPERS

MIXED AIR SENSOR

NOTE - Mixed air sensor is shown as it isfactory installed in a EMDH16M-41.EMDH16M-65 is similar. Mixed air sensorshould be removed from economizer andinstalled in supply air stream as shown infigure 51.

WIRING HARNESS(connects to jackplug inblower compartment)

DAMPER MOTOR

FILTER

WIRING HARNESS(connects to jackplug inblower compartment)

TRANSITION

TRANSITION

FILTER

RETURN DUCTFLANGE

OUTDOOR DAMPERHOOD

OUTDOOR DAMPERHOOD

RETURN DUCTFLANGE

Page 46

C-Economizers

D-Application

REMD16(M) and EMDH16(M) economizers can

only be applied to CHP16 commercial units.

CHP16R (residential) units are not equipped with

the necessary wiring hardware and therefore cannot

accept the economizers.

CHP16H units are not designed to accept econo�

mizers and are not equipped with the necessary

wiring. However, an REMD16M or REMD16 can be

field applied to a CHP16H if necessary by using a

RDE16-41 downturn transition. This application is

covered in more detail later in this section.

TABLE 24

CHA16 ECONOMIZERS (2-5 TON UNITS)

Economizer UnitMatchup

Type

REMD16-41

REMD16M-41

REMD16-65

REMD16M-65

EMDH16-41

EMDH16M-41

EMDH16-65

EMDH16M-65

Three Position Downflow

Modulating Downflow

Three Position Downflow

Modulating Downflow

CHA16-510CHA16-650

CHA16-510CHA16-650

Three Position Horizontal

Modulating Horizontal

CHA16-410

CHA16-410

Three Position Horizontal CHA16-510CHA16-650

Modulating Horizontal CHA16-510CHA16-650

CHA16H-261CHA16H-311CHA16-410

CHA16H-261CHA16H-311CHA16-410

A total of eight different economizers are available

for CHP16 commercial units. Table 24 describes the

economizers which are available.

E-REMD16 Downflow Economizer

REMD16M Downflow Economizer

The REMD16 and REMD16M economizers (figure

47) are designed for use with standard (downflow)

CHP16s. The economizer opens a set of dampers to

allow 0 to 100 percent outdoor air to be used for cool�

ing when outdoor humidity and temperature are ac�

ceptable. Additional (2nd stage) cooling demand is di�

rected to the compressor while the dampers remain

open. If outdoor air becomes unacceptable, the out�

door air dampers close to a predetermined minimum

position while the compressor cooling circuit cycles as

needed.

FIGURE 47

REMD16 DOWNFLOW ECONOMIZERREMD16M DOWNFLOW ECONOMIZER

OUTDOOR AIRDAMPERS

RETURN AIRDAMPERS

FACTORY INSTALLEDRETURN AIR FILTER

DAMPER MOTOR

ENTHALPY CONTROLTYPICAL

(REMD16M shown)

OUTDOOR AIRDAMPER HOOD

CONTROL ACCESSCOVER

Refer to the REMD16-41/65 Installation Instruction

Manual for specific details regarding installation. Refer

to the sequence of operation flowcharts (in back of this

manual) for detailed operation of the economizer. The

sequence of operation flowcharts also describe how the

economizer interacts with the CHP16 and the control

system being used.

F-EMDH16 Horizontal Economizer

EMDH16M Horizontal Economizer

The EMDH16 and EMDH16M economizers (figure

48) operate like the REMD16 and REMD16M except

they are designed for CHP16 units requiring horizon�

tal discharge and return air. Internal components and

operation of the horizontal economizer are identical

to the downflow economizer.

Page 47

Refer to the EMDH16-41/65 Installation Instruction

Manual for specific details regarding installation.

Refer to the sequence of operation flowcharts (in

back of this manual) for detailed operation of the

economizer. The sequence of operation flowcharts

also describe how the economizer interacts with the

CHP16 and the control system being used.

FIGURE 48

EMDH16 HORIZONTAL ECONOMIZEREMDH16M HORIZONTAL ECONOMIZER

OUTDOOR AIRDAMPERS

(under hood)

RETURN AIRDAMPERS FACTORY INSTALLED

RETURN AIR FILTER

OUTDOOR AIRDAMPER HOOD

FACTORYINSTALLED

TRANSITION

CONTROL ACCESSCOVER REMOVED

The physical location of controls in REMD16M and

REMD16 economizers is shown in figure 45. The

physical location of controls in EMDH16M and

EMDH16 economizers is shown in figure 46.

G-Economizer Operation

4-Enthalpy Control: Setpoint Control

The key to economizer operation is the enthalpy con�

trol. The enthalpy control senses total heat content in

outside air (temperature plus humidity) and uses that

information to control the amount of outside air

brought into the system. When the outside air enthal�

py is below the control setpoint, the control actuates a

motor which in turn adjusts outdoor dampers to meet

cooling demands of the building. When the heat con�

tent rises above control setpoint, the control de-acti�

vates and dampers close to preset minimum (not

closed) position.

Two types of adjustment may be made at the control.

The first is the control setpoint. The setpoint deter�

mines the temperature and humidity conditions at

which the outdoor air dampers will open and close.

The recommended setpoint is �A." If the economizer

is allowing air which is too warm or too humid into the

system, the control may be changed to a lower set�

point (B,C or D). Refer to enthalpy chart figure 49.

FIGURE 49

ENTHALPY CHART

° °

CHARTCURVE

A

B

C

D

°F °C

CONTROLPOINT 50%

RH

73

70

67

63

23

21

19

17

Example:

If the enthalpy control is set at setpoint �A" as shown in

figure 49, the following situation could occur. A cooling

demand when the outside air is at 75° and 20 percent

humidity would drive the economizer outdoor air damp�

ers open to utilize outdoor air for cooling. The compres�

sor cooling circuit would be disabled. However, if the

outdoor air should change to 70°F (a drop in tempera�

ture) and 70 percent humidity (a dramatic rise in humid�

ity), the �total heat content" of the outdoor air would rise

above the enthalpy control setpoint and de-activate the

damper motor to the preset minimum position. If cool�

ing demand is still present when the total heat of the

outside air rises above the control setpoint, cooling de�

mand is routed from the economizer to the compressor

cooling circuit.

FIGURE 50

ENTHALPY SEN�SOR

ALL ECONOMIZERSENTHALPYSENSOR

OUTDOORAIR DAMPERS

DAMPER HOOD

Page 48

5-Minimum Positioner

The second type of adjustment which may be made

at the control is the minimum position of the outdoor

damper blades. Each economizer has a minimum

positioner switch (potentiometer) which allows the

outdoor dampers to be adjusted to a preset mini�

mum position. This allows a preset amount of air ex�

change at all times during unit operation. When unit

operation stops, the dampers drive fully closed. The

potentiometer is located on the enthalpy control face

(modulating economizer) or on the damper motor

(three position economizer).

6-Enthalpy Sensor

The enthalpy sensor

is located on the out�

side portion of the

outdoor damper

blades (as shown in

figure 50). The sen�

sor monitors the total

heat content of the

outdoor air (temper�

ature plus humidity)

and sends the infor�

mation to the enthal�

py control. The en�

thalpy control uses

the information to determine if outdoor air can be

used for cooling.

7-Mixed Air Sensor

The sensor measures the resultant temperature of

the mixed air downstream of the evaporator coil. The

mixed air temperature is used by the enthalpy con�

trol when outdoor dampers are open to help deter�

mine whether outdoor air dampers should close.

Modulating economizers are equipped with a single

mixed air sensor. Three position economizers are

equipped with a separate sensor (switch) and sens�

ing bulb which are connected by a cap tube.

The mixed air sensor (bulb) is located in the supply

air stream. The sensor (modulating economizer) or

sensing bulb (three position economizer) fits

through a factory supplied hole in the panel dividing

the unit return and supply air (see figure 51). The

three position economizer sensor (switch) mounts to

pre-drilled holes in the unit panel dividing return and

supply air.

MIXED AIR SENSOR

FIGURE 51

REMD16M and EMDH16MMIXED AIR SENSOR

INSTALLATION

REMD16 and EMDH16MIXED AIR SENSOR

INSTALLATION

CHP16 UNIT

SENSOR HOLELOCATION

CONTROLHARNESS

CONTROLHARNESS

MIXED AIRSENSOR

CONTROLHARNESSMIXED AIR

SENSOR

CAPTUBE

SENSORBULB

SUPPLY AIR

Page 49

8-Wiring, Installation, Maintenance

The economizer uses a harness plug to connect to

the CHP16's harness connector located in the blow�

er compartment. Refer to figure 52 for REMD16

installation or figure 53 for EMDH16 installation. Al�

though a harness connector is used to connect the

CHP16 to the economizer, the economizer electri�

cally connects to the CHP16 differently depending

on which control system has been installed. The dif�

ferent electrical connections are made in relay kits

and controls located in the control area of the blower

compartment. All connections are made with quick-

connect type harness connectors. For specific de�

tails of economizer wiring and operation, refer to the

operating sequence section of this manual.

Figure 52 shows how an REMD16 is installed in a

CHP16 cabinet. Figure 53 shows how an EMDH16 is

installed in a CHP16 cabinet. For detailed installa�

tion and maintenance instructions, refer to the

REMD16-41/65 Installation Instructions or the

EMDH16-41/65 Installation Instructions.

FIGURE 52

REMD16 INSTALLATIONBLOWER

COMPARTMENT

DOWNFLOWRETURN AIR OPENING

REMD16or

REMD16M

FIGURE 53

EMDH16 INSTALLATION

UNIT

EMDH16or

EMDH16M

9-Modulating Damper Motor Check

Honeywell W7459A

1- Disconnect main power to the CHP16.

2- Turn thermostat control to OFF position (occu�

pied mode).

3- Install jumper across terminals 6-9 on blower

relay in unit control box.

4- Install jumper across enthalpy control termi�

nals T and T1. See figure 54 for terminal loca�

tion.

5- Restore power to unit. Outdoor damper should

drive to fully open position (60 to 90 sec. re�

quired for full travel). Observe travel for proper

damper operation.

6- Disconnect power to the unit. Outdoor damper

should spring return to closed position.

FIGURE 54

MODULATINGSOLID STATE ENTHALPY CONTROL

TR TR1

A

B C

D+

+

5

2

4

T1

P1P

T

1

MINIMUMPOSITION�

ER

LED

3

7- Remove T and T1 jumper then restore power

to the unit. Outdoor damper should drive to

minimum position. Adjust minimum damper

position pot located on control. See figure 54.

8- Disconnect power to unit and remove jumper

on blower relay terminals 6-9. Replace all pan�

els. Restore power to unit.

10-Three�Position�Damper�Motor�Check

Honeywell W7459C

1- Disconnect main power to the CHP16.

2- Remove the control access cover (see figures

45 and 46).

3- Install jumper across enthalpy control termi�

nals D and TR1. See figure NO TAG for termi�

nal location.


drive to fully open position (requires approxi�

mately 90 seconds for full travel). Observe

travel for proper damper operation.

5- Disconnect power to unit. Damper should

spring return to closed position.

6- Remove jumper installed in step 3. Install

jumper across enthalpy control terminals X

and TR1. See figure 55 for terminal location.

FIGURE 56

OAD16FRESH

AIR DAMPER

LOOSENSCREWS ANDSLIDE DOWN

TO ALLOWMORE AIR INTO

SYSTEM

Page 50

7- Disconnect power to unit and remove jumper.

Replace all panels.


drive to mid (minimum) position (requires

approximately 90 seconds for full travel). Ad�

just minimum position by turning thumb wheel

on damper motor.

FIGURE 55

THREE POSITIONSOLID STATE ENTHALPY CONTROL

TR TR1

A

B C

D+

+

5

2

4

X

D6

1

LED

3

SO

SR

11-Warm Up Kit

An optional warm up kit may be added to either

REMD16 or EMDH16 economizer (except CHP16s

using a Honeywell W7400 or T7300 Control Sys�

tem). The Warm Up Kit holds the dampers closed

during night setback and morning warm up. When

the first thermostat demand of the day is satisfied,

the warm up kit opens the outdoor dampers to mini�

mum position. The warm up kit mounts to the CHP16

in the control mounting area of the blower compart�

ment. The kit plugs into the unit wiring harness inline

between the unit and the economizer. For detailed

wiring and operation, refer to the sequence of opera�

tion section of this manual.

12-Night Relay

Optional night relay must be added to economizer

when night setback functions are desired with W973

or electromechanical control systems. Kit includes a

DPDT relay which is hard-wired to the economizer

harness.

If a W973 system is used, the relay holds the outdoor

dampers closed during setback. If an electrome�

chanical thermostat system is used, the relay holds

the outdoor dampers closed during setback, de-en�

ergizes the indoor thermostat and energizes the set�

back thermostat. Night relay is not required for any

other control system. Field wiring is shown in the fol�

lowing section of this manual. Night relay wiring dia�

gram designation is K11.

H-OAD16 Outdoor Air Damper

The OAD16 outdoor air

damper section (figure

56) installs in the

CHP16R or CHP16 to al�

low a fixed amount of out�

side air into the system.

The OAD16 replaces the

unit side panel where a

downflow economizer

would normally be

installed. The dampers

may be manually ad�

justed and locked in place

to allow up to 25 percent outside air into the system at all

times. Refer to the OAD16 installation instruction manual

for specific installation procedure. The washable filter sup�

plied with the OAD16 can be cleaned with water and a mild

detergent. It should be sprayed with Filter Handicoater

when dry prior to reinstallation. Filter Handicoater is R.P.

Products coating no. 418 and is available as Lennox Part

No. P-8-5069.

I-RDE16-41 Duct Enclosure for

REMD16-41 and REMD16M-41

Economizer Limited Application

CHP16H Series Units Only

CHP16H may be converted to downflow operation by add�

ing an RDE16-41 downturn transition and RMF16-41 roof

mounting frame as shown in figure 60. A manual outdoor

air damper is factory provided with the RDE16. The damp�

er is located in the access panel covering the economizer

opening. The damper provides a field set amount of out�

door air exchange (0 to 25%) at all times.

REMD16-41 (or REMD16M-41) economizer may be used

with CHP16H units in a limited downflow only application.

However, neither economizer can be directly mounted to

CHP16H. The RDE16-41 duct enclosure must be used to

provide the proper opening for economizer. Duct enclo�

sure RDE16-41 mounts to the CHP16H horizontal air

openings and the economizer slides in the RDE16-41

economizer opening (see figure 57 for installation).

Page 51

FIGURE 57

REMD16-41 / REMD16M-41 TO CHP16H INSTALLATION

UNIT

RDE16-41

RMF16-41

REMD16-41 orREMD16M-41REMOVE PANEL

TO INSTALLECONOMIZER

RETURN AIR

SUPPLY AIR

FIGURE 58

HEATING

COMPARTMENT

COMPRESSORCOMPARTMENT

CONTROL BOX

REMD16(M)-41ECONOMIZER

CHP16H UNIT(�B" SECTION WIRING DIAGRAM)

J3/P4

CHP16H TO REMD16(M)-41 ECONOMIZER

FIELD WIRING - WIRE ROUTING

ECONOMIZER

PIGTAILS

RDE16-41 TRANSITION

SEE C19 TO B34WIRING DIAGRAM

(BACK OF THISMANUAL)

WIRING HARNESSSUPPLIED

WITH RDE16-41

ECONOMIZER HARNESS

Page 52

FIGURE 59

RH

RC

G

W1

W2

Y1

Y2

X

6 10 3 1 15 4 12 13 14 2 8 9 5 11 7

R G Y1 W1

ACC

C L1 L2

CHP16H

J3 ECONOMIZER JACKINSIDE RDE16-41 TRANSITIONMATES TO ECONOMIZER PLUG P4

CHP16H TO REMD16-41 or REMD16M-41 ECONOMIZERFIELD WIRING

INDOORTHERMOSTAT

THERMOSTAT TO ECONOMIZER - 2 WIRES

UNIT TO ECONOMIZER - 5 WIRES

UNIT TO THERMOSTAT - 3 WIRES

SEE C19 TO B34WIRING DIAGRAM

(BACK OF THIS MANUAL)

6

4

3

1

9

7

CMC3-1CLOCK

FIELD WIRING

FIELD WIRING REQUIREDFOR NIGHT SETBACKFACTORY WIRING

K11

S12NIGHT STAT

NOTE - ALL FIELD WIRING ISIN ADDITION TO FACTORY

WIRING AND UNIT FIELD WIR�ING EXCEPT WHERE NOTED.

ECONOMIZER

PIGTAILS

The CHP16H is not factory equipped with the necessary wir�

ing needed to connect a REMD16-41 or REMD16M-41. To

compensate for the lack of unit harness, an economizer har�

ness is provided in the RDE16-41. The economizer connects

to the RDE16-41 harness using jackplugs. The RDE16-41

uses pigtails to hard-wire the economizer harness to the unit.

Field wire routing is shown in figure 58. Field wiring is shown

in figure 59.

RDE16 DUCT ENCLOSURE

FIGURE 60

UNITRDE16

RMF16-41

FACTORYINSTALLEDFRESH AIRDAMPER

J-Condenser Coil Guard Kit

Optional condenser coil guard kit is available for all units.

The kit includes PVC coated steel wire coil guard which is

field installed. CHP16H units require one guard,

CHP16-411/413 and CHP16R-411 units require two guards

and CHP16-511/513/651/653 and CHP16R-511/651 re�

quire three guards.

K-Compressor Crankcase Heater

CHP16R and CHP16H (208/230v) only

Factory installed crankcase heater is used in some

CHP16R and CHP16H series units. All commercial CHP16

series units are factory equipped with compressor crank�

case heater. Optional compressor crankcase heater is

available for field installation in any residential unit without

factory installed heater. The heater is a 45 watt self�regulat�

ing belly band type and is wired directly to line voltage.

L-DF16 Downflow Filter Kit

Optional downflow filter kit may be added to any CHP16

unit not equipped with factory installed filter brackets. The

kit provides a means for filtering (downflow) return air in�

side the cabinet. The kit includes rails which install in the

Page 53

blower compartment and allow the (one inch thick) filter

(furnished) to slide in. Two kits are available. DF16-41 (fig�

ure 61) installs in -410 units and DF16-65 (figure 62)

installs in -510/-650 units.

FIGURE 61

BLOWER

LEFT FILTERBRACKET

RIGHT FILTERBRACKET

DF16-41 DOWNFLOW FILTER KIT

SECURINGSCREW

FILTER BRACKETFILLER PIECE

(REMOVE FOR 2"FILTER)

SECURING SCREW(LEFT SIDE)

FIGURE 62

DF16-65 DOWNFLOW FILTER KIT

BLOWER

LEFT FILTERBRACKET

RIGHT FILTERBRACKET

SECURINGSCREW

SECURING SCREW

FILTER BRACKETFILLER PIECE

(REMOVE FOR 2" FILTER)

SECURINGSCREW

M-Timed-Off Control Kit (Figure 63)

Optional field installed timed-off controls prevent the

CHP16 compressor from short cycling. After a thermostat

demand, automatic reset timed-off control keeps compres�

sor off for 3-7 minutes.

NOTE - Some electronic thermostats have built in time

delay. Field installed time delay is not needed.

Operation: 1- If the compressor has been de-energized for more

than 3-7 minutes, there will be a 3-10 second delay af�

ter receiving a thermostat demand before the com�

pressor can be energized.

2- After the compressor has been de-energized, the

timed-off control keeps the compressor de-ener�

gized for 3-7 minutes.

3- If thermostat demand is present after 3-7 minutes,

compressor is immediately energized.

4- If there is no thermostat demand at the end of the 3-7

minute timed off period, the compressor remains de-

energized until the next thermostat demand when all

safety circuits are closed.

Page 54

TIMED�OFF KITTYPICAL FIELD WIRING OF 2-5 TON UNITS

CHP16H�261/311 SHOWN (40G20)

FIGURE 63

1

3

2

Timed�OffControl

Page 55

COMPRESSOR MONITORTYPICAL FIELD WIRING OF 2-5 TON UNITS

CHP16H�261/311 SHOWN (other units similar)

FIGURE 64

CompressorMonitor

Page 56

LOW AMBIENT KIT (LB�44961)TYPICAL FIELD WIRING OF 2-5 TON UNITS

CHP16H�261/311 SHOWN

FIGURE 65

Page 57

N-Optional�Compressor�Monitor�(Figure�64)

Optional compressor monitor can be installed in all units to

provide low ambient protection for the compressor. The

monitor (figure 64) is a N.O. temperature switch located in

the control box area. It is wired in series with the compres�

sor contactor. When ambient temperature drops below

40°F, the switch opens and de-energizes the compressor

contactor thereby protecting the compressor from low am�

bient operation.

O-Low Ambient Kit

The optional low ambient kit (figure 66) allows for mechani�

cal cooling operation at low outdoor temperature.

Low ambient kit field wiring is shown in figure 67. Low ambient

pressure switch is wired in series with the condenser fan L1

lead. Refer to low ambient kit installation instruction manual

for detailed installation instructions.

FIGURE 66

TYPICAL INSTALLATIONLOW AMBIENTPRESSURE SWTICH

HIGH PRESSURESWITCH COMPRESSOR

DISCHARGELINE

LOSS OFCHARGESWITCH

VALVEDEPRESSOR TEE

SHOCKLOOP

LOW AMBIENT KIT

The low ambient pressure switch cycles the condenser fan

while allowing normal compressor operation. This intermit�

tent fan operation results in a high evaporating tempera�

ture which allows the system to operate without icing the

evaporator coil and losing capacity.

IMPORTANTPotential for improper operation.

Compressor monitor cannot be used with optionallow ambient kit. Optional field installed compres�sor monitor MUST be disconnected before allow�ing low ambient kit to be used.

Adjustment:

The low ambient pressure switch is adjustable but the adjust�

ment knob does not adjust CUT-IN or CUT-OUT points. CUT-

IN point is fixed and cannot be adjusted. The scale on the

switch measures the difference in pressure between preset

CUT-IN and adjustable CUT-OUT points. Adjustment knob

changes CUT-OUT point by adjusting the DIFFERENCE be�

tween CUT-IN and CUT-OUT.

The low ambient pressure switch is factory set to CUT-IN at

285psig with a difference of 146psig (CUT-OUT at

140psig). Adjustment should not be needed. If adjustment

is needed, adjust the switch as follows:

1- Loosen knob securing screw to allow knob stop to

pass over fixed stop on control (see figure 68).

DIFFERENCE (set by knob) = CUT-IN POINT (fixed) mi�

nus CUT-OUT POINT

FIGURE 67

CONDFAN

LOW AMBIENTPRESSURE SWITCH

COMPRESSORCONTACTOR

BLUE

BLUE

DISCONNECTOPTIONAL

COMPRESSORMONITOR

LOSS OF CHARGESWITCH

HIGH PRESSURESWITCH

COMP

COMPRESSORJUNCTION BOX

FIELD WIRINGLOW AMBIENT KIT

FIGURE 68

LOW AMBIENT ADJUSTMENT DETAIL

ROTATE COUNTERCLOCKWISE

FIXEDSTOP

KNOBSECURING

SCREW

ADJUSTMENTKNOB

LOW AMBIENTCONTROL

SET INDICATORAT 140 PSIG

LOW AMBIENT ADJUSTMENT

Page 58

To find CUT-OUT point, re-arrange the equation so that:

CUT-OUT = CUT-IN minus the DIFFERENCE.

2- Rotate the knob as needed to set the difference indica�

tor at 145psig (1000kPa).

3- Tighten the securing screw after adjusting.

P-Roof Curb Power Kit

Optional Roof Curb Power kit allows line and low voltage

power to be brought into unit from RMF16 roof mounting

frame. Figure 70 shows typical installations. Roof Curb

Power kit is applicable only to larger (-410, -510 and -650)

unit sizes and can be used on both RMF16-41 and

RMF16-65 roof mounting frames. Two 7/8" knockouts are

provided along the long rails of each mounting frame. All

components in Roof Curb Power kit are field assembled

and field installed.

Q-Transitions

Optional supply/return transitions (SRT16 AND SRTH16)

are available for use with downflow CHP16s utilizing the

optional RMF16 roof mounting frame. The transition must

be installed in the RMF16 mounting frame before mounting

the CHP16 to the frame. Refer to the manufacturer's in�

structions included with the transition for detailed installa�

tion procedures.

R-Supply and Return Diffusers

Optional flush mount diffuser/return FD9-65 and extended

mount diffuser/return RTD9-65 are available for use with

the CHP16. Refer to the manufacturer's instructions in�

cluded with the transition for detailed installation proce�

dures.

S-Status Panels SP11 and SSP11

Optional status panels allow remote monitoring of system

operation. Two types of panels are available. The SP11

(figure 69) provides system readout only. The SSP11

switching status panel (figure 71) is a combination switch�

ing subbase and system readout. The SSP11 also has an

�After Hours Timer" to override unoccupied mode (night

heating setback / cooling setup).

NOTE - Status panels are not applicable to all CHP16

control systems. The following section details status

panel applications.

FIGURE 69

SP11 STATUS PANEL

Cool Mode

Heat Mode

Compressor 1

Compressor 2

No Heat

Filter

1-SP11 Application

The SP11 can be applied to all CHP16 control systems.

To operate an SP11, a readout relay kit is required to

interface the CHP16 to the SP11. Optional filter switch

kit must be added in order to make the filter light func�

tional.

2-SSP11 Application

The SSP11 can be applied to CHP16 units using stan�

dard electromechanical thermostat or Honeywell

W973 control systems only. The Prostat, W7400 and

T7300 control systems provide switching features simi�

lar to the SSP11, therefore, the SSP11 is not needed.

FIGURE 70

90° WATER TIGHTFLEXIBLE CONDUIT

90° WATER TIGHTFLEXIBLE CONDUIT 90° WATER TIGHT

FLEXIBLE CONDUIT

WATER TIGHTFLEXIBLE CONDUIT

WATER TIGHTFLEXIBLE CONDUIT

CONDUITCOUPLING

CONDUITCOUPLING

CONDUITCOUPLING

TYPICAL ROOF CURB POWER ENTRANCE

CONDUITCOUPLING WATERTIGHT

LOCKNUTNIPPLE(5" LENGTH)

MOUNTINGFRAME UNIT

DISCONNECTBOX STRAIGHT FLEXIBLE

CONDUIT FITTING

MOUNTINGFRAME

WATER TIGHTLOCKNUTNIPPLE

(5" LENGTH)

UNIT

Page 59

To operate an SSP11, a readout relay kit is required to

interface the CHP16 to the SSP11. An SSP11 relay kit is

also required (in addition to the readout relay kit) in units

using an electromechanical thermostat.

Optional filter switch kit is required to make the

dirty�filter light functional.

FIGURE 71

SSP11 SWITCHING STATUS PANEL

Cool Mode

Heat Mode

Compressor 1

Compressor 2

No Heat

Filter

OFF

HEATAUTO

COOL

EM HEAT

AFTER HOURS TIMER

START

SYSTEM

FANAUTO

ON

3-Indications and Functions

Both status panels are identical in function except for

switching and after hours capabilities of the SSP11.

a- The �COOL MODE" LED lights green to indicate

economizer �free cooling" operation when unit in�

cludes the economizer option. Otherwise, the LED

indicates mechanical cooling operation.

b- The �HEAT MODE" LED lights green during normal

heating operation.

c- The �COMPRESSOR 1" LED lights green when the

compressor is running. The light turns red if a com�

pressor safety switch opens during a compressor de�

mand.

d- The �COMPRESSOR 2" LED is not used in this ap�

plication.

e- The �NO HEAT" LED lights red on a loss of heat dur�

ing a heating demand.

f- The �FILTER" LED lights red when optional pres�

sure switch closes indicating dirty filters.

g- The �SYSTEM" switch on the SSP11 has five posi�

tions to indicate the following functions:

�OFF" - System off.

�HEAT" - System operates in heating mode.

�AUTO" - System automatically provides heating or

cooling on demand.

�COOL" - System operates in cooling mode.

�EM HEAT" - (Emergency Heat) If placed in this

position, the compressors are disabled and auxilia�

ry electric heat is energized.

h- The �FAN" switch on the SSP11 has two positions to

indicate the following functions:

�AUTO" - Blower cycles with demand.

�ON" - Blower runs continuously.

i- The �AFTER HOURS TIMER" on the SSP11 pro�

vides override of unoccupied mode operation (night

heating setback / cooling setup) from 0 to 12 hours.

In the occupied (day) mode, the after hours timer

has no effect on unit operation.

The unit must be in unoccupied mode (night) to acti�

vate timer. Set the potentiometer for number of

hours desired override and push the momentary

start button. Unit reverts to occupied mode opera�

tion for the set number of hours.

4-Installation and Wiring

The SP11 and SSP11 require relay kits to interface the

status panel to the control system and the unit. The fol�

lowing sections list the operation sequence and instal�

lation procedures for the relay kits and the status pan�

els.

a-Readout Relay Kit (RRB)

A readout relay kit (aka readout relay box - RRB) is

required for all units using an SP11 or SSP11 status

panel. RRB is shown in figure 72. RRB includes re�

lays which connect the panel to the unit. Status pan�

el will not operate without the RRB.

RRB Sequence of Operation:

1- Initial heating demand (W1) from the unit is routed

through RRB terminal 2 to SP11 terminal 2 to light

the green �HEAT" light.

2- The same heat demand is routed through RRB

terminal 2 and through (RRB relay) K29 N.C. con�

tacts to energize time delay DL6.

3- DL6 begins 60 second count before closing.

4- After current sensing relay K28 receives 24VAC

power, N.O. contacts close.

5- When current is sensed, N.O. contacts open.

6- When N.O. contacts K28 open, time delay DL6 re�

sets. When DL6 resets, the �NO HEAT" light is

prevented from energizing.

7- If current sensing relay does not sense current

(indicating a problem with the electric heat or

safety circuits) before time delay DL6 finishes its

60 second count, time delay contacts close and

red �NO HEAT" light is energized.

8- Other status panel lights are directly controlled by

the individual unit functions.

Page 60

DL6

64 5

1

2

3

4

5

6

7

8

9

10K29

EXISTING WIRINGFIELD WIRING

READOUT RELAY KIT (RRB) FIELD WIR�ING

FIGURE 72

1

3

C

C

C

NO

NC

CURRENT SENSING RELAY FIELD WIR�ING Current Sensing Loop

ECH16�185Line Voltage L1

K28

To TB1 Terminal W1or W973 Terminal H1 (normally open)

Black

Yellow

Orange

9- Each �COMPRESSOR" light depends on two

sources of voltage for green operation and one

source of voltage for red operation. Each lead is

tied electrically to either side of the compressor

high pressure switch. If the high pressure switch

opens, the green voltage side of the �COMPRES�

SOR" light will drop out leaving only the red �com�

pressor" light on.

b-Current Sensing Relay

A current sensing relay is connected to the RRB in

units with electric heat. Current sensing relay mo�

mentarily closes its normally open contacts when

power is applied to the relay coil (power is applied to

coil when first stage thermostat demand is received

by CHP16 terminal strip TB1). As soon as current is

sensed by current sensing relay, normally open con�

tacts reopen.

When current sensing relay (normally open) con�

tacts are closed, time delay DL6 is energized. DL6

begins a 30 second count before closing. When DL6

closes, �NO HEAT" light is energized.

Line voltage L1 passes through the loop in the current

sensing relay (figure 72). When current is sensed with

first stage heating demand present, the current sensing

relay's normally open contacts reopen. When the con�

tacts reopen, time delay DL6 loses power and resets

and the �NO HEAT" light is de�energized.Status panel

field wiring is shown in figures 74, 75, 76, 77 and 78.

c-SSP11 Relay Kit

SSP11 relay kit is required on units using an electro�

mechanical thermostat and an SSP11. The kit is used

with an RRB (readout relay kit) to interface the status

panel to the thermostat. An SSP11 Relay Kit is shown

in figure 73. The SSP11 relay kit cannot be used on

any other control system.

SSP11 Relay Kit Sequence of Operation:

1-The SSP11 relay kit contains two relays which af�

fect unit operation.

2- Relay K20 energizes when the SSP11 is switched

to �EM HEAT." Contacts K20-1 open to de-acti�

vate the green �HEAT" light. Simultaneously, the

control switch routes power backward through

the �HEAT" light. The �HEAT" light changes to red.

Relay K20 has no other effect on unit operation.

3- Relay K21 energizes when �FAN" switch is in

�ON" position. Contacts K21-1 switch to allow in�

door blower to run continuously.

5-Filter Switch Kit

EXISTING WIRINGFIELD WIRING

13 14

9 12

5 8

1 4

13 14

9 12

5 8

1 4

SSP11 RELAY KIT INTERNAL WIRING

RELAYK20

RELAYK21

FIGURE 73

321 7 4 5 6

An air filter switch kit is available for use with SP11

and SSP11. The switch is activated by high negative

pressure in the blower compartment caused by dirty

air filters or other restrictions. When high negative

pressure causes the switch to close, power is routed

from terminal strip terminal TB1-6 through the switch

to the red �FILTER" light in the status panel. See fig�

ure 79.

Y1

W1

G

45

6

7

8

910

11

Y2

W214

15

TB1 TERMINALSTRIP TB1

1

2

3

4

5

6

7

8

9

10

SP11 STATUSPANEL

1

2

3

4

5

6

7

8

9

10

ELECTROMECHANICAL ORELECTRONIC THERMOSTAT

SP11 FIELD WIRINGELECTROMECHANICAL OR

ELECTRONIC THERMOSTATS

W2

W1

Y2

RC

Y1

G

RH

S24

S4

1st STAGECOMPRESSOR #1

L1 L2 L3

TI T2 T3

K1

CONTACTORS

USED ONLY WITH CHP1

X

READOUTRELAY KIT AND

CURRENT SENSINGRELAY (Figure 72).

NOT ON ALLTHERMOSTATS

CNO

S27 OPTIONALFILTER SWITCH KIT

REMOVE FACTORY-INSTALLEDJUMPER WIRES FROM TB1 (4 TO5, 8 TO 9, AND 14 TO 15) WHENUSING WARM-UP KIT

OPTIONAL EQUIPMENT24VAC FIELD INSTALLED24V EXISTING WIRING

Page 61

FIGURE 74

NOTE-All field wiring shown is in addition to thermostat and othercontrol wiring. Refer to unit and control wiring diagrams.

Y1

W1

G

4

5

6

7

8

10

11

Y2

W2

14

15

TB1 UNITTERMINALSTRIP TB1

1

2

3

4

5

6

7

8

9

10

S27 OPTIONALFILTER SWITCH

KIT 97C85


1

2

3

4

5

6

7

8

9

10

SP11 FIELD WIRING W973CONTROL SYSTEM

S24

S4

L1 L2 L3

TI T2 T3

K1

CONTACTORS


RYBWTRTR15243

T1T

H1

H2 H3

C1

C2

C3

DC WIRES MUSTBE RUN IN SEP�ARATE SHIELDEDCABLE

T7067THERMOSTAT

10

7

6

45

1

2

3

W973 Module

CNO

SP11STATUSPANEL12F83

R

T

OPTIONALREMOTESENSOR

RT2

11

9

CMC3-1TIMER

RT1

8

1Page 62

FIGURE 75


CURRENT SENSINGRELAY (Figure 72). NOTE-All field wiring shown is in addition to thermostat and other

control wiring. Refer to unit and control wiring diagrams.

9

REMOVE FACTORY-INSTALLEDJUMPER WIRES FROM TB1 (4 TO 5,8 TO 9, AND 14 TO 15)

Y1

W1

G

4

5

6

7

8

9

10

11

Y2

W2

14

15

TB1 UNITTERMINAL

STRIP

1

2

3

4

5

6

7

8

9

10

S27 OPTIONALFILTER SWITCH

KIT 97C85


1

2

3

4

5

6

7

8

9

10

SP11 FIELD WIRINGW7400 CONTROL SYSTEM

L1 L2 L3

TI T2 T3

K1

CONTACTORS

DC WIRES MUSTBE RUN IN CABLESEPARATE FROM

AC WIRES

T7400THERMOSTAT

4

1

2

3

CNO

SP11STATUSPANEL12F83

R

T

OPTIONALREMOTE SENSOR

RT2

Y1

W1

W2

W7400CONTROLMODULE

REMOVE FACTORY-INSTALLEDJUMPER WIRES ON TB1 (4 TO 5, 8TO 9, AND 14 TO 15)

Page 63

FIGURE 76

S24

S4



CURRENT SENSING RELAY(Figure 72).

NOTE-All field wiring shown is in addition to thermostat and othercontrol wiring. Refer to unit and control wiring diagrams.

Y1

W1

G

45

6

7

8

9

10

11

Y2

W214

15

TB1 UNITTERMINALSTRIP TB1

1

2

3

4

5

6

7

8

9

10

S27 OPTIONAL FILTER

SWITCH KIT


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

CMC3-1CLOCK

1

23

SSP11 FIELD WIRINGW973 CONTROL SYSTEM

L1 L2 L3

TI T2 T3

K1

CONTACTORS

RYBWTRTR15243

T1T

H1

H2 H3

C1

C2

C3

DC WIRES MUST BERUN IN SEPARATE

CABLE

T7067THERMOSTAT

5

7

6

4

8

1

2

3

W973 Module

R

T

OPTIONALREMOTE

SENSOR RT2

READOUTRELAY KIT SEEFIGURE NO TAG

SSP11SWITCHING STATUS

PANEL

CAUTION: DC WIRES MUSTBE RUN IN CABLE SEP�ARATE FROM AC WIRES

REMOVE THREE FACTORY-INSTALLED JUMPER WIRES ONTB1 (4 to 5, 8 to 9, and 14 to 15)

CNO

Page 64

FIGURE 77

S24

S4


X TERMINALNOT ON ALL

THERMOSTATS

Y2

W1

RH

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

Y1

W1

G

4

5

6

7

8

910

11

Y2

W214

15

TB1 TERMINALSTRIP

1

2

3

4

5

6

7

8

9

10

ELECTROMECHANICAL ORELECTRONIC THERMOSTAT

SSP11 FIELD WIRING ELECTROMECHANICALAND ELECTRONIC THERMOSTATS

W2

RC

Y1

G

L1 L2 L3

TI T2 T3

K1

CONTACTORS

USED ONLY WITH TWO-STAGE COOLING1

X

READOUT RELAYKIT

CNOS27 OPTIONAL

FILTER SWITCH KIT

REMOVE FACTORY-INSTALLED JUMPERWIRES FROM TB1 (4 TO 5, 8 TO 9, AND 14TO 15) WHEN USING WARM-UP KIT


7 6 5 4 3 2 1

SSP11RELAY

KIT

1

23

CMC3-1TIME

CLOCK

SSP11 SWITCHINGSTATUS PANEL

DISCONNECTFACTORY

INSTALLEDWIRE

Page 65

FIGURE 78

S24

S4


Page 66

FIGURE 79

FIELD SUPPLIED AIR FILTERMOUNTED IN RETURN AIR DUCT

SECURE FILTER SWITCHTO BLOWER HOUSING OR INSIDE MULLIONATTACH HOSE TO HIGH SIDE OF SWITCH

BLOWER HOUSING

HORIZONTAL SUPPLY AND RETURN AIR COVERS

ROUTE HOSE THROUGH DUCT TO OPPOSITESIDE OF FILTER

LEAVE LOW SIDE OF SWITCH OPEN TOATMOSPHERE OF BLOWER COMPARTMENT

GCS16 UNIT

SUPPLY AIR RETURN AIR

TYPICAL FILTER SWITCH INSTALLATION

Page 67

XII-FIELD WIRING

CONTACTOR(K1)

ELECTRIC ELEMENT/CONTROL BOX

ASSEMBLY

FIGURE 80

CHP16H-261/311 WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGESINGLE DISCONNECT SWITCH APPLICATION

(ECH16-15-1P SHOWN)

POWERSUPPLY WIRES

RACEWAY

LOWVOLTAGEPIGTAILS

ECH16-P FUSEBOX ASSEMBLY

LOADWIRES

FUSEHOLDER

UNIT 24 VOLT HAR�NESS ASSEMBLY

PLUG (P2)

ELECTRIC ELEMENT/CONTROL BOX JACK

(J2)

POWER SUPPLY WIRES(connect to center terminals)


POWERWIRES


ELECTRIC ELEMENT/CONTROL BOX ASSEMBLY

CHP16(R)-411, -511, -651 AND CHP16-261, -311, -411, -511, -651WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE-SINGLE DISCONNECT SWITCH APPLICATION

(ECH16-15-1P SHOWN)

FIGURE 81

POWER SUPPLYWIRES

LOADWIRES

FUSE HOLDER

ECH16FUSE BOXASSEMBLY

UNIT 24 VOLT HARNESSASSEMBLY PLUG (P2)

CONTACTOR(K1)

POWER WIRESLOAD WIRES

ELECTRIC ELEMENT/CONTROL BOX JACK (J2)

LOW VOLTAGEFIELD WIRING

MAKE-UP AREA


Page 68



CHP16-413, -513, -653 WITH ECH16-Y, -G, -J SERIES ELECTRIC HEAT PACKAGESINGLE DISCONNECT SWITCH APPLICATION

(ECH16-20/25-1Y SHOWN)

FIGURE 82

POWER SUPPLYWIRES

LOADWIRES

FUSE HOLDER

ECH16FUSE BOXASSEMBLY


CONTACTOR(K1)




MAKE-UP AREA


FIGURE 83

Page 69

CONTACTOR(K1)


FIGURE 84

CHP16H-261/311 WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGEMULTIPLE DISCONNECT SWITCH APPLICATION

(ECH16-15-1P SHOWN)

RACEWAY

LOWVOLTAGE PIGTAILS

FUSEHOLDER


ELECTRIC ELEMENT/CONTROLBOX JACK (J2)

POWER SUPPLY WIRES


POWERSUPPLY WIRES

POWER SUPPLY WIRES FROMTWO DISCONNECT SWITCHES

POWER SUPPLYWIRES


CHP16(R)-411, -511, -651 AND CHP16-261, -311, -411, -511, -651WITH ECH16-1P SERIES ELECTRIC HEAT PACKAGE-MULTIPLE DISCONNECT SWITCH APPLICATION

(ECH16-15-1P SHOWN)

FIGURE 85

FUSE HOLDER


CONTACTOR(K1)



MAKE-UP AREA


POWER SUPPLYWIRES FROM TWO

DISCONNECTSWITCHES

Page 70


CHP16-413, -513, -653 WITH ECH16-Y, -G, -J SERIES ELECTRIC HEAT PACKAGEMULTIPLE DISCONNECT SWITCH APPLICATION

(ECH16-20/25-1Y SHOWN)

FIGURE 86

FUSE HOLDER


CONTACTOR(K1)

POWER SUPPLYWIRES



MAKE-UP AREA


POWER SUPPLYWIRES FROM TWO

DISCONNECTSWITCHES

FIGURE 87

Page 71

CONTACTOR(K1)

ELECTRIC ELEMENTASSEMBLY

POWER SUPPLYWIRES

RACEWAY

LOWVOLTAGEPIGTAILS

ECH16 FUSE BOXASSEMBLY FORCHP16H/CHP16H

UNIT

LOADWIRES


ELECTRIC ELEMENTJACK (J2)



FIGURE 88

CHP16H-261/311 WITH ECH16R-1P SERIES ELECTRIC HEAT PACKAGESINGLE DISCONNECT SWITCH APPLICATION

(ECH16R-10-1P SHOWN)

ECH16R FUSE BOXASSEMBLY FORELECTRIC HEAT

POWERWIRES

PIGTAILS

ELECTRIC ELEMENT/JACK(J2)


ELECTRIC ELEMENT ASSEMBLY

CHP16(R)-411, -511, -651 AND CHP16-261, -311, -411, -511, -651WITH ECH16R-1P SERIES ELECTRIC HEAT PACKAGE-SINGLE DISCONNECT SWITCH APPLICATION

(ECH16R-10-1P SHOWN)

FIGURE 89

POWER SUPPLYWIRES

LOAD WIRESECH16R FUSE BOX

ASSEMBLY FORELECTRIC HEATECH16 FUSE BOX

ASSEMBLY FORCHP16/CHP16 UNIT


CONTACTOR(K1)



MAKE-UP AREA


PIGTAILS

Page 72

FIGURE 90

POWER SUPPLY WIRES TO (2)DISCONNECT SWITCHES

CONTACTOR(K1)

ELECTRIC ELEMENTASSEMBLY

FIGURE 91

CHP16H-261/311 WITH ECH16R-1P SERIES ELECTRIC HEAT PACK�AGE

MULTIPLE DISCONNECT SWITCH APPLICATION(ECH16R-10-1P SHOWN)

RACEWAY

LOWVOLTAGEPIGTAILS


ELECTRIC ELEMENT JACK(J2)

POWER SUPPLY WIRES


POWERSUPPLYWIRES

WIRENUTS

Page 73

POWER SUPPLYWIRES

CHP16(R)-411, -511, -651 AND CHP16-261, -311, -411, -511, -651WITH ECH16R-1P ELECTRIC HEAT PACKAGE-MULTIPLE DISCONNECT SWITCH

(ECH16-10-1P SHOWN)

FIGURE 92

CONTACTOR(K1)


MAKE-UP AREA


POWER SUPPLYWIRES TO TWODISCONNECT

SWITCHES

ELECTRIC ELEMENT ASSEMBLY



WIRENUTS

FIGURE 93

15

C25 diagram with B25 diagram residential CHP16H with basic heat pump thermostat

Page 74

RC

RH

G

W1

Y2

O

Y1

C

1

2

3

4

5

6

7

8

10

9

11

12 13

14

16

17

1820

21

22

23

24

25

26

27

28

29 19

Page 75

B25 DIAGRAM AND C25 DIAGRAM

CHP16H Residential Single�Phase UnitXIII-OPERATION SEQUENCE

The flowcharts in this section show the step by step sequence that takes place when thermo�stat demand is received by the CHP16. The sequence describes the actions of devices in theunit which control blowers, fans and other components in the system. The sequence is out�lined by numbered steps which correspond to circled numbers on the adjacent diagram.

The following is an explanation of Lennox' model number designations:

CHP16R: Residential unit without crankcase heater, high pressure switch, loss ofcharge switch and low voltage terminal strip.

CHP16H: Same as CHP16R except in horizontal only (non�convertible) cabinet.

CHP16: Commercial unit with crankcase heater, high pressure switch, loss ofcharge switch and low voltage terminal strip.

CHP16R and CHP16H units are designed for residential use only and are not equipped withthe necessary hardware for connecting optional control systems or economizer. The C25thermostat section is a straight�forward residential heat pump thermostat design for theCHP16R and CHP16H exclusively. The thermostat used may be electromechanical or elec�tronic 1 cool / 2 heat (single stage heat with auxiliary heataing and emergency heating capa�bility). The compressor handles all cooling demand and all 1st stage heating demand. Auxil�iary heating demand is handled by optional electric heat unit (not shown).

NOTE� This is a basic operation sequence for a single�phase CHP16. The sequence shows asingle�phase CHP16H connected to a �C25" thermostat control section. These units are notequipped with latch or transfer relays as in larger CHP16 series units. The operation se�quence is significantly different from commercial CHP16 units.

Thermostat DemandThermostat Terminals Energized

New Designation (Old Designation)

Cooling

1st Stage Heating

2nd Stage Heating

Y1(M), G(F), O(R)

Y1(M), G(F)

Y1(M), W1(Y), G(F)

Emergency Heat W1(Y)

A-B25 SECTION with C25 SECTION

Basic residential CHP16H is a single�stage heat, single�stage cool unit. With optional elec�tric heat added, the unit is capable to two�stage heating. Crankcase heater is self�regulatingand is powered at all times.

Sequence of Operation - Cooling:

1- Line voltage energizes transformer T1. Transformer T1 provides 24VAC power to all unitcontrols and thermostat.

2- Cooling demand energizes Y1, G and O in the thermostat. Y1 energizes compressor con�tactor K1 and defrost control terminal HLD, G energizes relay K3 and O energizes reversingvalve L1.

3- K1 is a single�pole contactor which allows compressor terminal R and one leg of the con�denser fan to be powered at all times.

4- K1�1 closes to energize the compressor and the condenser fan. As the compressor gainsspeed, compressor terminal S is powered by start capacitor C7.

5- K3�2 switches to energize the blower on high speed.

6- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Run ca�pacitor C5 remains in the circuit between terminals R and S during all compressor operationto optimize motor efficiency.

7- Defrost is locked out during cooling demand. S6 and S46 are forced open by outdoor coiltemperature and liquid line pressure respectively. Although the defrost control may call fordefrost after a timed interval, the unit cannot go into defrost because defrost relay K4 cannotenergize.

Heating:

8- On a call for heat, Y1 and G are energized in the thermostat. Y1 energizes compressor con�tactor K1 and defrost control terminal HLD and G energizes blower relay K3.


10- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Run ca�pacitor C5 remains in the circuit between terminals R and S during all compressor operationto optimize motor efficiency.


12- Additional heating demand (W1 from the thermostat) energizes optional electric heat direct�ly. Indoor blower remains on high speed powered by relay K3.

Defrost Mode:

13- During heating operation, when outdoor coil temperature drops below 35°F+4°F, the defrostthermostat closes.

14- After 30, 60 or 90 minutes of heating demand (depending on how the control is preset),CMC1 checks for defrost demand by closing a set of (internal) relay contacts connected toterminal OUT. Terminal OUT remains enabled for 10+1 minutes. If defrost temperature ther�mostat S6 is closed when terminal OUT is enabled, defrost relay K4 is allowed to energizeand defrost begins.

15- When K4 energizes, K4�1 immediately opens and K4�2 and K4�3 immediately close.

16- When K4�1 opens the internal timer is reset to zero.

17- When K4�2 closes, Y1 is shunted to W1 to energize optional electric heat.

18- When K4�3 closes, Defrost pressure switch S46 is enabled and fan relay K10 is energized.K10�1 and K10�2 immediately switch. If S46 is closed, defrost relay K4 is latched�in until de�frost terminates.

19- When K10�1 opens, the outdoor fan is de�energized.

20- When K10�2 switches, reversing valve L1 is energized.

21- Defrost is terminated when relay K4 loses power. K4 can lose power two ways.

22- If defrost is not satisfied before 14+1 minutes, CMC1 (terminal OUT) internal relay contactsopen, K4 is de�energized and defrost is terminated.

23- In order for defrost to terminate before 14 minutes has elapsed, S6 and S46 must both open.When both open, K4 is de�energized and defrost is terminated.

24- When K4�1 closes the internal timer is restarted.

25- When K4�2 opens, Y1 to W1 shunt is opened and optional electric heat is de�energized.

26- When K4�3 opens, fan relay K10 is de�energized. K10�1 and K10�2 immediately switch.Outdoor fan begins operating when K10�1 closes and reversing valve L1 loses power whenK10�2 switches.

Emergency Heat Mode:

27- Relay K3 is de�energized. K3�2 switches to close 3�9 and open 6�9.

28- Emergency heat demand (thermostat W1) energizes optional electric heat directly.

29- Indoor blower is energized on med�high speed powered by optional electric heat.

C25 diagram with B26 diagram residential CHP16R with basic heat pump thermostat

Page 76

RC

RH

G

W!

Y2

O

Y1

C

1

2

3

45

6

78

10

911

12 13

15 16

17

1820

21

22

23

24

25

26

27

28

29

14

19

Page 77

B26 DIAGRAM AND C25 DIAGRAM

CHP16H or CHP16R Residential Single�Phase UnitB-B26 SECTION with C25 SECTION

Basic residential CHP16R is a single�stage heat, single�stage cool unit. With optional electricheat added, the unit is capable to two�stage heating. Crankcase heater is self�regulating andis powered at all times.

NOTE � This is a basic operation sequence for a single�phase CHP16. The sequenceshows a single�phase CHP16R or CHP16H connected to a �C25" thermostat control sec�tion.These units use residential heat pump thermostats (1 cool / 2 heat). These units are notequipped with latch or transfer relays as in larger CHP16 series units. The operation se�quence is significantly different from commercial CHP16 units.



2- Cooling demand energizes Y1, G and O in the thermostat. Y1 energizes compressor con�tactor K1 and defrost control terminal HLD, G energizes relay K3 and O energizes reversingvalve L1.

3- K1 is a single�pole contactor which allows compressor terminal R and one leg of the con�denser fan to be powered at all times.



6- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Runcapacitor C5 remains in the circuit between terminals R and S during all compressor opera�tion to optimize motor efficiency.


Heating:

8- On a call for heat, Y1 and G are energized in the thermostat. Y1 energizes compressor con�tactor K1 and defrost control terminal HLD and G energizes blower relay K3.


10- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Runcapacitor C5 remains in the circuit between terminals R and S during all compressor opera�tion to optimize motor efficiency.


12- Additional heating demand (W1 from the thermostat) energizes optional electric heat direct�ly. Indoor blower remains on high speed powered by relay K3.

Defrost Mode:






18- When K4�3 closes, Defrost pressure switch S46 is enabled and fan relay K10 is energized.K10�1 and K10�2 immediately switch. If S46 is closed, defrost relay K4 is latched�in until de�frost terminates.




22- If defrost is not satisfied before 14+1 minutes, CMC1 (terminal OUT) internal relay contactsopen, K4 is de�energized and defrost is terminated.

23- In order for defrost to terminate before 14 minutes has elapsed, S6 and S46 must both open.When both open, K4 is de�energized and defrost is terminated.








C21 diagram with B25 diagram and D8 diagramspecial limited commercial application of residential CHP16Hwith basic thermostat, downturn transition and three�position economizer

Page 78

RCRH

Y1

G

W1

Y2

O

C

1

2

3

5

6

7

8

109

11

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Page 79

B25 DIAGRAM WITH C21 DIAGRAM AND D8 DIAGRAM

Limited Commercial Application of

CHP16H Residential Single�Phase Unit Connected To RDE16 and Three�Position Economizer

with Basic Electromechanical or Electronic ThermostatC-C21 SECTION and B25 SECTION with D8 SECTION (commercial application of elec�

tromechanical or electronic thermostat wired to a residential unit with three�posi�tion economizer).

CHP16H units, even though not equipped for commercial use, may be converted to commer�cial downflow use in a special limited application. This application requires the addition of a fieldsupplied, field installed conversion relay (K80, 24VAC SPDT). The conversion relay allows aconventional heat pump thermostat (1 cool / 1 heat with reversing valve and emergency heatoutputs - required for CHP16H) to be used with Lennox commercial economizer. This applica�tion also requires the use of RDE16�31 roof duct enclosure to convert the unit to downflow use.The RDE16�31 includes a factory installed harness for connecting optional REMD16�31 orREMD16M�31 economizer.

Basic residential CHP16H is a single�stage cool, single�stage heat unit with optional auxiliaryelectric heat. When the economizer is added, cooling is handled by the economizer whenoutdoor air conditions are appropriate (as determined by the enthalpy control in the econo�mizer) and the compressor is disabled. If outdoor conditions are inappropriate for cooling,the unit reverts to mechanical cooling and cooling demand is handled by the compressor.When optional electric heat (not shown) is added to the unit, the unit becomes a two�stageheating unit. All first stage heating demand is handled by the compressor and all auxiliary andemergency heat demand is handled by the optional electric heat.

NOTE� This is a basic operation sequence for a single�phase CHP16. The sequenceshows a single�phase CHP16H connected to a �C21" thermostat control section and a �D8"three�position commercial economizer section. These units use residential heat pumpthermostats (1 cool / 1 heat). These units are not equipped with latch or transfer relays as inlarger CHP16 series units. The operation sequence is significantly different from commer�cial CHP16 units.

NOTE� The RDE16�31 economizer harness is represented in diagram C21. The economiz�er harness and jack J3 are located inside the RDE16�31, not inside the unit as in otherCHP16 commercial units. REMEMBER, this is a limited application converting a residentialunit to commercial use.

The harness (shown in diagram C21) has pigtails on the unit end and harness jack J3 on the

economizer end. The unit end of the harness hard�wires to the unit and thermostat with pig�tails. Economizer jack J3 at the end of the economizer harness connects directly into econo�mizer plug P4.

This particular application connects the REMD16�41 three�position economizer to theCHP16H. The RDE16�31 return air side panel is removed and the REMD16�41 slides intothe side of the cabinet (same as it would into the side of a commercial CHP16). Economizerharness jack is located in the return air compartment of the RDE16�31.

Sequence of Operation - Cooling, Enthalpy Low:


2- Cooling demand energizes Y1, G and O in the thermostat. G energizes relay K3 and O ener�gizes reversing valve L1 and relay K80. K80�1 and K3�2 contacts switch immediately.

3- When thermostat terminal G is energized, damper motor terminal X is also energized.

4- When 24VAC is applied across damper motor terminals X and TR, the outdoor air dampersopen to mid (minimum) position.

5- When K3 is energized, K3�2 switches to energize the blower on high speed.

6- When K80�1 switches, cooling demand Y1 is to enthalpy control A6 terminal 1.

7- Enthalpy control A6 has determined that outside air can be used for cooling and hasswitched internal relays 1K and 2K.

8- Cooling demand (Y1) is routed through enthalpy control terminal 6 and through discharge airthermostat S13 to enthalpy control terminal D.

9- When 24VAC is applied across terminals D and T of damper motor, the damper motor ener�gizes and outdoor air dampers open fully. Cooling demand is supplied by outdoor air.

Cooling, Enthalpy Change To High:

10- Enthalpy control internal relays 1K and 2K switch. Voltage across D and TR drops out whilevoltage across X and TR remains. Outdoor air dampers close to minimum position.

11- Cooling demand is sent from thermostat terminal Y1 through enthalpy sensor terminals 1and 2 and through enthalpy control terminal 5 to energize the compressor contactor. Thecompressor handles all cooling demand.

C21 diagram with B25 diagram and D5 diagramspecial limited commercial application of residential CHP16Hwith basic thermostat, downturn transition and modulating economizer

Page 80

RCRH

Y1

G

W1

Y2

O

C

1

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4

5

6 7

810

9

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Page 81

B25 DIAGRAM WITH C21 DIAGRAM AND D5 DIAGRAM

Limited Commercial Application of

CHP16H Residential Single�Phase Unit Connected To RDE16 and Modulating Economizer

with Basic Electromechanical or Electronic ThermostatD-C21 SECTION and B25 SECTION with D5 SECTION (commercial application of elec�

tromechanical or electronic thermostat wired to a residential unit with modulat�ing. economizer).

CHP16H units, even though not equipped for commercial use, may be converted to commer�cial down�flow use in a special limited application. This application requires the addition of afield supplied, field installed conversion relay (K80, 24VAC SPDT). The conversion relay allowsa conventional heat pump thermostat (1 cool / 1 heat with reversing valve and emergency heatoutputs - required for CHP16H) to be used with Lennox commercial economizer. This applica�tion also requires the use of RDE16�31 roof duct enclosure to convert the unit to downflow use.The RDE16�31 includes a factory installed harness for connecting optional REMD16�31 orREMD16M�31 economizer.

Basic residential CHP16H is a single�stage cool, single�stage heat unit with optional auxiliaryelectric heat. When the economizer is added, cooling is handled by the economizer whenoutdoor air conditions are appropriate (as determined by the enthalpy control in the econo�mizer) and the compressor handles second stage cooling. If outdoor conditions are inap�propriate for cooling, the unit reverts to mechanical cooling and all cooling demand is han�dled by the compressor. When optional electric heat (not shown) is added to the unit, the unitbecomes a two�stage heating unit. All first stage heating demand is handled by the compres�sor and all auxiliary and emergency heat demand is handled by the optional electric heat.

NOTE� This is a basic operation sequence for a single�phase CHP16. The sequenceshows a single�phase CHP16H connected to a �C21" thermostat control section and a �D5"modulating commercial economizer section. These units use residential heat pump ther�mostats (1 cool / 1 heat). These units are not equipped with latch or transfer relays as inlarger CHP16 series units. The operation sequence is significantly different from commer�cial CHP16 units.

NOTE� The RDE16�31 economizer harness is represented in diagram C21. The econo�mizer harness and jack J3 are located inside the RDE16�31, not inside the unit as in otherCHP16 commercial units. REMEMBER, this is a limited application converting a residentialunit to commercial use.

The harness (shown in diagram C21) has pigtails on the unit end and harness jack J3 on the

economizer end. The unit end of the harness hard�wires to the unit and thermostat with pig�tails. Economizer jack J3 at the end of the economizer harness connects directly into econo�mizer plug P4.

This particular application connects the REMD16M�41 modulating economizer to theCHP16H. The RDE16�31 return air side panel is removed and the REMD16M�41 slides intothe side of the cabinet (same as it would into the side of a commercial CHP16). Economizerharness jack is located in the return air compartment of the RDE16�31.

Sequence of Operation - Cooling, Enthalpy Low:


2- Cooling demand energizes Y1, G and O in the thermostat. G energizes relay K3 and O ener�gizes reversing valve L1 and relay K80. K80�1 and K3�2 contacts switch immediately.

3- When thermostat terminal G is energized, damper motor terminal TR is also energized.

4- When a voltage is applied between damper motor terminals TR and TR1, the damper motoropens to minimum position.

5- When K3 is energized, K3�2 switches to energize the blower on high speed.

6- When K80�1 switches, cooling demand Y1 is sent to enthalpy control A6 terminal 1.

7- Enthalpy control A6 has determined that outside air can be used for cooling and hasswitched internal relays 1K and 2K.

8- Cooling demand (Y1) is routed through enthalpy control to energize internal relay 1S. Inter�nal contacts 1S1 close to complete a circuit through damper motor terminals T and T1.

9- When a voltage is applied across terminals T and T1 of damper motor, the damper motorenergizes and outdoor dampers open. Supply air sensor R1 varies the voltage across T andT1 and the outdoor air dampers adjust accordingly. First stage cooling is provided by outdoorair.

Cooling, Enthalpy Change To High:

10- Enthalpy control internal relays 1K and 2K switch. Internal relay 1S is de�energized and 1S1opens. Outdoor air dampers close to minimum position.

11- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1and 2 and through enthalpy control terminal 5 to energize the compressor contactor. Thecompressor handles all cooling demand.

C1 diagram with B37 diagram commercial single�phase CHP16 with basic thermostat

Page 82

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Page 83

C1 DIAGRAM AND B37 DIAGRAM

Single-Phase Commercial CHP16 without Economizer Connected to Electromechanical ThermostatE-COMMERCIAL THERMOSTAT SYSTEMS

Commercial units (CHP16) are factory equipped with crankcase heater, high pressureswitch, loss of charge switch and low voltage terminal strip. Units are also equipped withcommercial controls wiring harness and jackplugs for connecting Lennox commercial con�trols and thermostats.

1- C1 SECTION and B37 SECTION (electromechanical thermostat wired to single�phase commercial unit)

The C1 thermostat section is a straight-forward electromechanical thermostat design for thecommercial CHP16. CHP16R and CHP16H units are designed for residential use only andare not equipped with the necessary hardware for connecting optional control systems oreconomizer.

Basic CHP16 is a single�stage heat, single�stage cool unit. When optional electric heat (notshown) is added to the unit, the unit becomes a two�stage heating unit. All units are factoryequipped with hard start components (start capacitor and potential relay). All units use asingle �dual" capacitor for both the compressor and condenser fan motors.

NOTE - This is a basic operation sequence for a single-phase CHP16. The sequenceshows a single-phase commercial CHP16 connected to a �C1" thermostat control section.These units use commercial 2 stage heat / 2 stage cool (non�heat pump) thermostat andare equipped with latch and transfer relays to to switch between cooling, heating and de�frost modes.

Thermostat Demand Thermostat Terminals Energized

1st Stage Cooling

2nd Stage Cooling

1st Stage Heating

Y1, G

Y1, Y2, G

W1

2nd Stage Heating W1, W2



2- Latch relay K6 controls operation of reversing valve L1 during normal operation (contactsK10�2 control reversing valve during defrost). Latch relay K6 operates as follows:

a- 24VAC applied to K6 �SET" coil closes K6�1 and switches K6�2 (terminals 6�8 close and4�6 open). Terminals 7 and 4 remains closed when power is removed.

b- 24VAC applied to K6 �RESET" coil opens K6�1 and switches K6�2 (terminals 6�8 openand 4�6 close). K6�1 and K6�2 remain in this position when power is removed.

3- Cooling demand energizes Y1 and G in the thermostat. Y1 energizes K6 relay �SET" coil. Genergizes indoor blower relay K3. K6�1 and K6�2 immediately switch.

4- When K6�1 closes, reversing valve L1 is energized. When K6�2 switches (terminals 6�8close), contactor K1 and defrost control CMC1 are energized.

5- K1 is a single�pole contactor which allows compressor terminal R and one leg of the con�denser fan to be powered at all times. K1�1 closes to energize the compressor and the con�denser fan. As the compressor gains speed, compressor terminal S is powered by start ca�pacitor C7.

6- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Run sideof dual capacitor C12 (in addition to run capacitor C5, CHP16R-651 units only) remains inthe circuit between terminals R and S during all compressor operation to optimize motor effi�ciency.


8- K3�2 switches to energize the blower on high speed. K3�1 switches to power the economizer(if equipped). Dampers open to minimum position.

Heating:

9- 1st stage heating demand energizes W1 in the thermostat. W1 energizes transfer relay K8and K6 relay �RESET" coil. K6�1, K6�2 and K8�1 all switch immediately.

10- When K8�1 switches (terminals 4�7 close) indoor blower relay K3 is energized.

11- When K6�1 opens, reversing valve L1 is de�energized. When K6�2 switches (terminals 6�8open and 6�4 close), compressor contactor K1 and defrost control CMC1 are energized.

12- K1 is a single�pole contactor which allows compressor terminal R and one leg of the con�denser fan to be powered at all times. K1�1 closes to energize the compressor and the con�denser fan. As the compressor gains speed, compressor terminal S is powered by start ca�pacitor C7.

13- When the compressor nears full speed potential relay K31 is energized and start capacitorC7 is taken out of the circuit. K31 remains energized during compressor operation. Run sideof dual capacitor C12 (in addition to run capacitor C5, CHP16R-651 units only) remains inthe circuit between terminals R and S during all compressor operation to optimize motor effi�ciency.

14- K3�2 switches to energize the blower on high speed. K3�1 switches to power the economiz�er (if equipped). Dampers open to minimum position.

15- Additional heating demand (W2) is directed to optional electric heat (not shown).Defrost Mode:






21- When K4�3 closes, defrost pressure switch S46 is enabled and fan relay K10 is energized.K10�1 and K10�2 immediately switch. If S46 is closed, defrost relay K4 is latched in until de�frost terminates




25- If defrost is not satisfied after 14+1 minutes, CMC1 (terminal OUT) internal relay contactsopen, K4 is de�energized and defrost is terminated.

26- If both defrost thermostat S6 and S46 open before 14 minutes has elapsed, K4 is de�ener�gized and defrost is terminated.








C1 diagram with B27 diagram 208/230V-3ph. commercial unit without economizerconnected to electromechanical thermostat

Page 84

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Page 85

C1 DIAGRAM AND B27 DIAGRAMThree-Phase 208/230V Commercial CHP16 without Economizer Connected to Electromechanical Thermostat

2- C1 SECTION and B27 SECTION (electromechanical thermostat wired to 208/230Vthree�phase commercial unit)

The C1 thermostat section is a straight-forward electromechanical thermostat designed forthe commercial CHP16. Basic CHP16 is a single�stage heat, single�stage cool unit. Whenoptional electric heat (not shown) is added to the unit, the unit is capable of two�stage heat.

NOTE-This is a basic operation sequence for a three-phase CHP16. The sequence showsa three-phase commercial CHP16 connected to a �C1" thermostat control section. Theseunits use commercial 2 stage heat / 2 stage cool (non�heat pump) thermostat and areequipped with latch and transfer relays to switch between cooling, heating and defrostmodes.




a- 24VAC applied to K6 �SET" coil closes K6�1 and switches K6�2 (terminals 6�8 close and4�6 open). Terminals 7 and 4 remain closed when power is removed.




5- When K1�1 closes, the compressor and outdoor fan begin operating immediately.

6- K3�2 switches to energize the blower on high speed. K3�1 closes (enables optional econo�mizer if installed). Dampers open to minimum position.

7- Defrost is locked out during cooling demand. S6 and S46 are forced open by outdoor coiltemperature and liquid line pressure respectively. Although the defrost control may call fordefrost after a timed interval, the unit cannot go into defrost because S6 and S46 are keepingdefrost relay K4 from energizing.

Heating:





12- K3�2 switches to energize the blower on high speed. K3�1 switches to enable the economiz�er (if equipped). Dampers open to minimum position.









21- When K10�2 switches, reversing valve L1 is energized and optional economizer (if installed)is disabled.




25- When K4�1 closes, the internal timer is restarted.


27- When K4�3 opens, fan relay K10 is de�energized. K10�1 and K10�2 immediately switch.Outdoor fan begins operating when K10�1 closes. Reversing valve L1 loses power and op�tional economizer (not shown) is enabled when K10�2 switches.

C1 diagram with B28 diagram 460V and 575V commercial units without economizerconnected to electromechanical thermostat

Page 86

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Page 87

C1 DIAGRAM AND B28 DIAGRAMThree-Phase 460V or 575V Commercial CHP16 without Economizer Connected to Electromechanical Thermostat

3- C1 SECTION and B28 SECTION (electromechanical thermostat wired to 460V or575V three�phase commercial unit)

The C1 thermostat section is a straight-forward electromechanical thermostat designed forthe commercial CHP16. Basic CHP16 is a single�stage heat, single�stage cool unit. Whenoptional electric heat (not shown) is added to the unit, the unit is capable of two�stage heat.

NOTE-This is a basic operation sequence for a three-phase CHP16. The sequence showsa three-phase commercial CHP16 connected to a �C1" thermostat control section. Theseunits use commercial 2 stage heat / 2 stage cool (non�heat pump) thermostat and areequipped with latch and transfer relays to switch between cooling, heating and defrostmodes.




a- 24VAC applied to K6 �SET" coil closes K6�1 and switches K6�2 (terminals 6�8 close and4�6 open). Terminals 7 and 4 remain closed when power is removed.





6- K3�2 switches to energize the blower on high speed. K3�1 closes (enables optional econo�mizer if installed). Dampers open to minimum position.

7- Defrost is locked out during cooling demand. S6 and S46 are forced open by outdoor coiltemperature and liquid line pressure respectively. Although the defrost control may call fordefrost after a timed interval, the unit cannot go into defrost because S6 and S46 are keepingdefrost relay K4 from energizing.

Heating:





12- K3�2 switches to energize the blower on high speed. K3�1 switches to enable the economiz�er (if equipped). Dampers open to minimum position.









21- When K10�2 switches, reversing valve L1 is energized and optional economizer (if installed)is disabled.




25- When K4�1 closes, the internal timer is restarted.


27- When K4�3 opens, fan relay K10 is de�energized. K10�1 and K10�2 immediately switch.Outdoor fan begins operating when K10�1 closes. Reversing valve L1 loses power and op�tional economizer (not shown) is enabled when K10�2 switches.

1 23

4

5

6

11

11

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8

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10

C1diagramelectromechanical thermostat with three�position economizer

with D8 diagram

Page 88

Thermostat Footnotes

Economizer Footnotes

Page 89

C1 DIAGRAM WITH D8 DIAGRAM

Electromechanical Thermostat with Three�Position Economizer4-C1 Section with D8 Section - Basic (three�position) Economizer Operation

When a REMD16 or EMDH16 Economizer section is applied to the CHP16 with electrome�chanical thermostat, two stages of cooling are available dependent on the actions of the en�thalpy control inside the economizer. By sensing outside temperature and relative humidity,the enthalpy control determines if outside air can be used as a first stage of cooling. If so, firststage cooling is handled by outdoor air dampers and 2nd stage cooling is handled by thecompressor. When outdoor air conditions become unsatisfactory for cooling, the outdoor airdampers close and the compressor handles all cooling demand.

NOTE - In order to understand how optional controls affect operation of the CHP16, youmust first read and understand how all the CHP16 components work.

Factory jumper-plug P3 is removed from unit harness jack J3 and discarded. Economizerplug P4 replaces plug P3. These connections are made in the unit blower compartment.

NOTE� This operation sequence assumes the use of a conventional 2 cool / 2 heat (non�heat pump) thermostat.

Operation Sequence:

NOTE- In this operation sequence the unit diagram has been omitted in order to concen�trate on the interaction between thermostat and controls.

1- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.

2- Enthalpy control A6 terminal X and damper motor terminal X are powered by unit relay K3when there is a blower demand or by K13 when there is a heating demand . When 24VAC isapplied between terminals TR and X, the damper motor is energized and the outdoor damp�ers open to mid (minimum) position.

3- Economizer jack J28 is not used in this application and should remain disconnected.

4- Blower B3 is energized by thermostat terminal G. On a cooling demand, thermostat terminalG energizes relay K3 (not shown) which in turn energizes the blower. When K3 energizes,K3-1 closes to energize the blower and K3-2 closes to energize the economizer and openthe outdoor air dampers to mid (minimum) position.

I. Enthalpy Control in Low Position (outside air can be used for cooling).1st stage cool (all models):

5- Initial cooling demand Y1 is sent to enthalpy control A6 terminal 1.

6- Enthalpy control A6 has determined that outside air can be used for cooling and hasswitched internal 1K and 2K internally.

7- Cooling demand is routed through enthalpy control terminal 6 and through discharge airthermostat S13 to enthalpy control terminal D and damper motor terminal D.

8- When 24VAC is applied across terminals D and T of damper motor, the damper motor ener�gizes and outdoor dampers open fully. First stage cooling is provided by outdoor air.

2nd stage cool (all models):

9- Economizer outdoor air dampers remain open.

10- Additional cooling demand is routed from thermostat Y2 through enthalpy control terminals 3and 5 to energize the compressor. The compressor provides all additional cooling demand.

II. Enthalpy Control in High Position (outside air cannot be used for cooling).Cooling:

11- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1and 2 and through enthalpy control terminal 5 to energize the compressor. The compressorhandles all cooling.

Night Setback (optional)

12- Optional field installed time clock and night thermostat S12 must be connected for night set�back operation.

13- Blower B3 operates only during a heating demand when night thermostat is closed.

14- When clock contacts close, relay K11 energizes. Contacts K11-1 open to disable the daythermostat and contacts K11-2 open to drive the dampers full closed.

15- Night thermostat S12 is typically set with setpoints below thermostat S1. During unoccupiedperiods, K11-1 opens while S1 is disabled. When S12 closes, power is supplied to S1 andthe unit operates normally. When S12's setpoint is reached, S12 opens, S1 is disabled andunit operation stops.

16- Shortly before the building is to be occupied, clock contacts open to de-energize relay K11.Contacts K11-1 close to restore power the thermostat S1 and contacts K11-2 close to re�store power to the minimum positioner. Outdoor air dampers open to mid (minimum) posi�tion during blower operation.

C1diagramelectromechanical thermostat with modulating economizer

with D5 diagram

Page 90

24V POWER

ECONOMIZER

BLOWER

HEAT 1

HEAT 2

COOL 2

COOL 1

24V COMMON

1

2



3

4 5

6

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Page 91

C1 DIAGRAM with D5 DIAGRAM

Electromechanical Thermostat with Modulating Economizer5-C1 Section with D5 Section - Basic (modulating) Economizer Operation

When an REMD16M or EMDH16M economizer section is applied to the CHP16 with electro�mechanical thermostat, two stages of cooling are available dependent on the actions of theenthalpy control inside the economizer. By sensing outside temperature and relative humid�ity, the enthalpy control determines if outside air can be used as a first stage of cooling. If so,first stage cooling is handled by outdoor air dampers and 2nd stage cooling is handled by thecompressor. The enthalpy control continuously adjusts the outdoor air dampers to maintain abalanced mixed air temperature. When outdoor air conditions become unsatisfactory forcooling, the outdoor air dampers close and the compressor handles all cooling demand.


Factory jumper-plug P3 is removed from unit harness jack J3 and discarded. Economizerplug P4 replaces plug P3. These connections are made in the unit blower compartment.


Operation Sequence:

NOTE - In this operation sequence the unit diagram has been omitted in order to concen�trate on the interaction between thermostat and controls.

1- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.

2- Damper motor terminal TR is powered by unit relay K3 when there is a blower demand or byK13 when there is a heating demand. When 24VAC is applied between terminals TR andTR1, the damper motor is energized and the outdoor dampers open to minimum position.

3- Blower B3 is energized by thermostat terminal G. On a cooling demand, thermostat terminalG energizes relay K3 which in turn energizes the blower. When K3 energizes, K3-1 closes toenergize the blower and K3-2 closes to energize the economizer (see step 2) and open theoutdoor air dampers to minimum position.

I. Enthalpy Control in Low Position (outside air can be used for cooling).1st stage cool (all models):

4- Initial cooling demand Y1 is sent to enthalpy control A6 terminal 1.

5- Enthalpy control A6 has determined that outside air can be used for cooling and hasswitched 1K and 2K internally.

6- Cooling demand is routed through enthalpy control to energize internal relay 1S. Internalcontacts 1S1 close to complete a circuit through damper motor terminals T and T1.

7- When a voltage is applied across terminals T and T1 of damper motor, the damper motorenergizes and outdoor dampers open. Supply air sensor R1 varies the voltage across T andT1 and the outdoor air dampers adjust accordingly. First stage cooling is provided by outdoorair.

2nd stage cool (all models):

8- Economizer outdoor air dampers remain open.

9- Additional cooling demand is routed from thermostat Y2 through enthalpy control terminals 3and 5 to energize the compressor. The compressor provides all additional cooling.

II. Enthalpy Control in High Position (outside air cannot be used for cooling).Cooling:

10- Enthalpy control internal relays 1K and 2K switch. Internal relay 1S is de-energized and 1S1opens. Outdoor air dampers close to minimum position.

11- Cooling demand is sent from thermostat terminal Y1 through enthalpy control terminals 1and 2 and through enthalpy control terminal 5 to energize the compressor. The compressorhandles all cooling.

Night Setback (optional field installed)

12- Optional field installed time clock, night thermostat S12 and night relay K11 must be con�nected for night setback operation (night setback relay K11 not factory equipped in modulat�ing economizer - it must be field installed for night setback).

13- Blower B3 operates only during a heating demand when night thermostat is closed.

14- When clock contacts close, relay K11 energizes. Contacts K11-1 open to disable the daythermostat and contacts K11-2 open to drive the dampers full closed.

15- Night thermostat S12 is typically set with setpoints below thermostat S1. During unoccupiedperiods, K11-1 opens while S1 is disabled. When S12 closes, power is supplied to S1 andthe unit operates normally. When S12's setpoint is reached, S12 opens, S1 is disabled andunit operation stops.

16- Shortly before the building is to be occupied, clock contacts open to de-energize relay K11.Contacts K11-1 close to restore power the thermostat S1 and contacts K11-2 close to re�store power to the minimum positioner. Outdoor air dampers open to minimum position dur�ing blower operation.

C2-1 diagramelectromechanical thermostat with three�position economizer and warm-up

with D8 diagram

Page 92

24V POWER

ECONOMIZER

BLOWER

HEAT 1

HEAT 2

COOL 2

COOL 1

24V COMMON


Unit Footnotes

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2

3

4

5

6

7a

7b

7c

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9

1011

12

13

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Page 93

C2-1 DIAGRAM WITH D8 DIAGRAM

Electromechanical Thermostat with Three�Position Economizer and Warm-Up6-C2-1 Section with D8 Section

An optional feature of the REMD16 and EMDH16 economizer is a warm-up kit which holdseconomizer outdoor air dampers closed during night heat operation and while the CHP16 iswarming the building after night setback. The warm-up kit temporarily disables the econo�mizer (dampers are held closed) during morning warm-up to keep cool outside air from beingmixed with return air. Once the temperature setpoint is reached, the economizer is allowed tooperate normally (outdoor air dampers open to mid position to allow for required minimum airexchange.


NOTE - 1-The warm-up kit requires the use of optional time clock CMC3-1.

2-The warm-up kit can only be applied to CHP16 units with economizer.

WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS�TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM�PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, AW973 RELAY KIT MUST NOT BE CONNECTED TO A ELECTROMECHANICAL THER�MOSTAT CONTROL SYSTEM.

WARNING - BE CAREFUL TO CONNECT RELAY KITS TO THE PROPER JACK ANDPLUG IN THE CHP16 BLOWER COMPARTMENT. REFER TO WIRING DIAGRAM. IM�PROPER CONNECTION WILL CAUSE CONTROL FAILURE.

The warm-up kit mounts in the control mounting area of the CHP16 blower compartment. Nowiring is required. Jumper plug P3 is removed and discarded. Warm-up kit harness plug P8connects directly into jack J3 in the blower compartment. Warm-up kit harness jack J8 con�nects to economizer harness plug P4.


Operation Sequence:

NOTE-This operation sequence emphasizes warm�up kit operation. Unit diagram hasbeen omitted.

1- When relay K41 is energized during normal operation, the economizer functions normallyand is locked in until night setback.

2- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.Night Setback:

3- Time clock CMC3-1 should be adjusted so that clock contacts remain closed during hourswhen the building is not occupied. The contacts are set to open shortly (usually 1 hour) be�fore the building is to be occupied.

4- When clock contacts close, relay K11 in the economizer and K42 in the warm-up kit are ener�gized.

5- Contacts K11-1 open to disconnect power to thermostat S1. K11-2 open to drive the damp�ers full closed.

6- Contacts K42-1 open to disengage relay K41.

7- When relay K41 disengages, power is disconnected to the economizer:

a-Contacts K41-1 open to lock out economizer operation.

b-Contacts K41-2 close (not used).

c-Contacts K41-3 open to disconnect power to the economizer.

d-Contacts K41-4 open (not used).

8- During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power isreturned to S1 and the unit operates (heating demand) normally. When S12's setpoint isreached, S12 opens, S1 is disabled and unit operation stops.

9- Blower operates only on demand energized by CHP16 heat relay K25 when S12 is closed.

10- Thermostat S1 and economizer remain inoperable until time clock CMC3-1 contacts open.First Heat Demand After Night Setback (Begin Warm-Up)

11- Shortly before the building is to be occupied, time clock CMC3-1 contacts open.

12- Relay K42 disengages and contacts K42-1 close.

13- Relay K11 disengages. Contacts K11-1 close to allow power to thermostat S1. ContactsK11-2 close to allow outdoor air dampers to open. Note that dampers remain closed untilrelays K3 and K41 are energized.

14- Since contacts K40-1 are normally closed and contacts K42-1 have just switched closed,timer DL7 is energized. Timer DL7 is normally open and closes 30 seconds after being ener�gized.

15- If heat demand W1 reaches relay K40 before delay DL7 closes, contacts K40-1 open, delayDL7 loses power and resets and the economizer is locked out for the first heat demand byrelay K41 (contacts K41-3 remain open). If heat demand W1 reaches relay K40 after delayDL7 closes, relay K41 energizes and the economizer locks in for the day until night setback.

16- When first heat demand is satisfied, relay K40 disengages and relay contacts K40-1 close.Relay contacts K42-1 are already closed (clock contacts open). Time delay DL7 begins 30second count. If a second heat demand W1 reaches relay K42 within 30 seconds, delay DL7loses power and resets. If a second heat demand W1 does not reach relay K42 within 30sec., time delay DL7 contacts close and relay K41 energizes.

17-When relay K41 energizes, the economizer is allowed to operate normally, controlled by relayK3:

a-Contacts K41-1 close to lock in economizer operation until night setback.

b-Contacts K41-2 open (not used).

c-Contacts K41-3 close to allow power to the economizer.

d-Contacts K41-4 close (not used).

18- Once energized, relay K41 locks in and the economizer operates until relay K42 is energizedby night setback (contacts K42-1 open to disengage relay K41).

C2-1 diagramelectromechanical thermostat with modulating economizer and warm-up

with D5 diagram

Page 94

24V POWER

ECONOMIZER

BLOWER

HEAT 1

HEAT 2

COOL 2

COOL 1

24V COMMONEconomizer Footnotes


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Page 95

C2-1 DIAGRAM WITH D5 DIAGRAM

Electromechanical Thermostat with Modulating Economizer and Warm-Up7-C2-1 Section with D5 Section

An optional feature of the REMD16M and EMDH16M economizer is a warm-up kit whichholds economizer outdoor air dampers closed during night heat operation and while theCHP16 is warming the building after night setback. The warm-up kit temporarily disables theeconomizer (outdoor dampers are held closed) during morning warm-up to keep cool out�side air from being mixed with return air. Once the temperature setpoint is reached, the econ�omizer is allowed to operate normally (outdoor air dampers open to minimum position to al�low required minimum air exchange.


NOTE - 1-The warm-up kit requires the use of optional time clock CMC3-1.

2-Night relay K11 (may or may not be factory installed in economizer) and night thermo�

stat S12 are also required.

3-The warm-up kit can only be applied to CHP16's with economizer.

WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS�TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM�PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, AW973 RELAY KIT MUST NOT BE CONNECTED TO AN ELECTROMECHANICALTHERMOSTAT CONTROL SYSTEM.


The warm-up kit mounts in the control mounting area of the CHP16 blower compartment. Nowiring is required. Jumper plug P3 is removed and discarded. Warm-up kit harness plug P8connects directly into jack J3 in the blower compartment. Warm-up kit harness jack J8 con�nects to economizer harness plug P4.


Operation Sequence:

NOTE-This operation sequence emphasizes warm-up kit operation. Unit diagram hasbeen omitted.

1- When relay K41 is energized during normal operation, the economizer functions normallyand is locked in until night setback.

2- Economizer outdoor air dampers drive full closed anytime blower B3 is not operating.Night Setback:

3- Time clock CMC3-1 should be adjusted so that clock contacts remain closed during hourswhen the building is not occupied. The contacts are set to open shortly (usually 1 hour) be�fore the building is to be occupied.

4- When clock contacts close, relay K11 in the economizer and K42 in the warm-up kit are en�ergized.

5- Contacts K11-1 open to disconnect power to thermostat S1. K11-2 open to drive the damp�ers full closed.

6- Contacts K42-1 open to disengage relay K41.

7- When relay K41 disengages, power is disconnected to the economizer:

a-Contacts K41-1 open to lock out economizer operation.

b-Contacts K41-2 close (not used).

c-Contacts K41-3 open to disconnect power to the economizer.

d-Contacts K41-4 open (not used).

8- During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power isreturned to S1 and the unit operates (heating demand) normally. When S12's setpoint isreached, S12 opens, S1 is disabled and unit operation stops.

9- Blower operates only on demand energized by chp16 heat relay K25 when S12 is closed.

10- Thermostat S1 and economizer remain inoperable until time clock CMC3-1 contacts open.First Heat Demand After Night Setback (Begin Warm-Up)

11- Shortly before the building is to be occupied, time clock CMC3-1 contacts open.

12- Relay K42 disengages and contacts K42-1 close.

13- Relay K11 disengages. Contacts K11-1 close to allow power to thermostat S1. ContactsK11-2 close to allow outdoor air dampers to open. Note that dampers remain closed untilrelays K3 and K41 are energized.

14- Since contacts K40-1 are normally closed and contacts K42-1 have just switched closed,timer DL7 is energized. Timer DL7 is normally open and closes 30 sec. after being ener�gized.

15- If heat demand W1 reaches relay K40 before delay DL7 closes, contacts K40-1 open, delayDL7 loses power and resets and the economizer is locked out for the first heat demand byrelay K41 (contacts K41-3 remain open). If heat demand W1 reaches relay K40 after delayDL7 closes, relay K41 energizes and the economizer locks in for the day until night setback.

16- When first heat demand is satisfied, relay K40 disengages and relay contacts K40-1 close.Relay contacts K42-1 are already closed (clock contacts open). Time delay DL7 begins 30sec. count. If a second heat demand W1 reaches relay K42 within 30 sec., delay DL7 losespower and resets. If a second heat demand W1 does not reach relay K42 within 30 sec., timedelay DL7 contacts close and relay K41 energizes.

17-When relay K41 energizes, the economizer is allowed to operate normally, controlled byrelay K3:

a-Contacts K41-1 close to lock in economizer operation until night setback.

b-Contacts K41-2 open (not used).

c-Contacts K41-3 close to allow power to the economizer.

d-Contacts K41-4 close (not used).

18- Once energized, relay K41 locks in and the economizer operates until relay K42 is energizedby night setback (contacts K42-1 open to disengage relay K41).

C11-1 diagram electromechanical thermostat with night setback relay kit

Page 96

24V POWER

ECONOMIZER

HEAT 1

HEAT 2

COOL 2

COOL 1

BLOWER

24V COMMON

4

3

2

15

Page 97

C11 DIAGRAM

Electromechanical Thermostat

with Night Setback Thermostat

and without Economizer8-C11 SECTION (electromechanical thermostat with night relay kit)

Optional night (setback relay) kit allows CHP16 units without economizer (REMD16 orEMDH16) to automatically setback the thermostat to reduce energy consumption duringtimes when the building is not occupied. The night kit achieves this by electrically disconnect�ing thermostat S1 and connecting a night thermostat during periods when the building is notoccupied. The night thermostat can then be adjusted with a lower setpoint as needed for un�occupied heating.

NOTE - In order to understand how these optional controls affect the operation of theCHP16, you must first understand how all CHP16 components work. Refer to the operationsequence for basic unit operation.

WARNING - CONNECT ONLY RELAY KITS DESIGNED FOR THIS CONTROL SYS�TEM. RELAY KITS DESIGNED FOR OTHER CONTROL SYSTEMS ARE NOT COM�PATIBLE AND CONTROL DAMAGE OR FAILURE WILL RESULT. FOR EXAMPLE, ONUNITS USING AN ELECTROMECHANICAL THERMOSTAT WITHOUT AN ECON�OMIZER, A WARM-UP KIT MUST NOT BE CONNECTED. ONLY THE OPTIONALNIGHT KIT CAN BE USED.


NOTE - The night kit accessory requires the use of optional time clock CMC3-1/ and option�al night thermostat.

No wiring is required for installing the kit. Jumper plug P3 is removed from the unit and dis�

carded. Night kit harness plug P4 connects directly into jack J3 in the unit blower compart�ment.


Night Setback:

NOTE-This operation sequence emphasizes night�kit operation. Unit diagram hasbeen omitted.

1- Time clock CMC3-1 contacts are open during normal operation of the unit when the buildingis occupied. All cooling and heating stages function normally.

2- When clock contacts switch closed (when the building is not occupied) relay K11 isenergized.

3- When relay K11 is energized, contacts K11-1 open disconnecting power to thermostat S1.Thermostat S1 remains disconnected until clock contacts open (usually 1 hour before thebuilding is to be occupied). During the time thermostat S1 is disconnected, night thermostatS12, which has been set at a lower setpoint than S1, controls operation of the unit.

During unoccupied periods, K11-1 opens and S1 is disabled. When S12 closes, power issupplied to S1 and the unit operates normally. When S12's setpoint opens, S1 is disabledand unit operation stops.

4- The blower operates as normal, controlled by heating demand when S12 is closed.

5- Shortly before the building is to be occupied, time clock CMC3-1 contacts open and relayK11 is de-energized. Contacts K11-1 then close and power is restored to thermostat S1.

A28 diagram with B25 diagram 5kw residential electric heat matchedto typical residential heat pump

Page 98

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Page 99

A28 DIAGRAM WITH B25 DIAGRAMECH16R 5kw Single�Phase Electric Heat with CHP16, CHP16R or CHP16H

9-A28 SECTION with B25 SECTION

This section explains the operation sequence of optional electric heating units. Thermostatand optional economizer wiring diagrams are omitted from this section in order to simplify theoperation sequence.

Optional ECH16R electric heat is a single�phase heating unit designed for residential use.The �R" designation indicates that this electric heat unit cannot interact with commercial uniteconomizer dampers to provide minimum air exchange during heating mode.

The ECH16R unit plugs in to the CHP16 using jackplugs J2/P2. No field wiring is required.

NOTE� This operation sequence assumes the use of a conventional 1 cool / 2 heat heatpump thermostat.

Operation Sequence (Including Defrost):

NOTE-This operation sequence emphasizes electric heat operation. Thermostat diagramhas been omitted.

1- When disconnect is closed, line voltage is supplied to unit controls and indoor thermostat.

2- On a call for indoor blower from the thermostat (heat pump heating or cooling operation),blower relay K3 is energized. Relay K3 is not energized during emergency heat operationand K3 contacts remain in normally closed position.

3- When K3 is de�energized, indoor blower operates on med�high heating speed controlled byoptional electric heat (during emergency heat operation only). Otherwise, indoor blower op�erates on high speed controlled by relay blower demand.

4- On a call for first stage heat (thermostat Y1 and G), the compressor, defrost control, outdoorfan and indoor blower are energized.

5- On a call for second stage heat (thermostat W1, Y1 and G), optional electric heat is ener�gized in addition to the compressor, defrost control, outdoor fan and indoor blower. secondstage demand energizes thermal heat relay K32 and resistor R6. Within 1�110 seconds,contacts K32�1 close followed by K32�2.

6- Since blower relay K3 is energized by thermostat terminal G, the indoor blower remains onhigh speed.

7- When K32�1 closes, nothing happens (since relay K3 is energized).

8- When K32�2 closes, heating element HE1 is energized.

9- When heating demand stops, heat relay K32 cycles off on a last�on first�off basis.Emergency Heat Sequence:

10- Relay K3 is de�energized.

11- When K32�1 closes, The indoor blower is powered on med�high speed through K3�2 normal�ly closed contacts.

A29 diagram with B26 diagram 7kw or 10kw residential electric heatmatched to typical residential heat pump

Page 100

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Page 101

A29 DIAGRAM WITH B26 DIAGRAMECH16R 7kw or 10kw Single�Phase Electric Heat with CHP16, CHP16R or CHP16H



Optional ECH16R electric heat is a single�phase heating unit designed for residential use.The �R" designation indicates that this electric heat unit cannot interact with commercial uniteconomizer dampers to provide minimum air exchange during heating mode.

The ECH16R unit plugs in to the CHP16 using jackplugs J2/P2. No field wiring is required.

NOTE� This operation sequence assumes the use of a conventional 1 cool / 2 heat heatpump thermostat.


NOTE - This operation sequence emphasizes electric heat operation. Thermostat diagramhas been omitted.


2- On a call for 1st stage heat, thermostat Y1 and G are energized.

3- The compressor, defrost control and outdoor fan are energized by Y1.

4- Indoor blower relay K3 is energized by G.

5- When K3�2 switches, the indoor blower is energized on high speed.

6- On a call for second stage heat (thermostat W1 and W2), optional electric heat is energizedin addition to the compressor, defrost control, outdoor fan and indoor blower. Second stagedemand energizes thermal heat relays K32 and K33. Within 1�110 seconds K32�1 andK33�1 close followed by K32�2 and K33�2.

7- When either K32�1 or K33�1 close, nothing happens (since blower relay K3 is energizedK3�2 remains switched). The indoor blower continues to operate on high speed.



10- When heating demand stops, heat relays K32 and K33 cycle off on a last�on first�off basis.

A12 diagram with B37 diagram 15kw, 20kw or 25kw electric heat matched to typ�ical single�phase commercial heat pump

Page 102

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Page 103

A12 DIAGRAM WITH B37 DIAGRAMECH16 15kw, 20kw or 25kw Single�Phase Electric Heat with CHP16, CHP16R or CHP16H



Optional ECH16�15, �20 and �25 three�phase electric heat units are designed for commercialuse. These units are capable of directing optional economizer dampers to allow minimumfresh air exchange during electric heat operation.

The ECH16 unit plugs in to the CHP16 using jackplugs J2/P2. No field wiring is required.





2- On a call for first stage heat (thermostat W1), transfer relay K8 and latch relay K6 (reset) areenergized.

3- When K6 (reset) is energized, the compressor, defrost control and outdoor fan are ener�gized.

4- When transfer relay K8 is energized, K8�1 contacts switch and blower relay K3 is energized.K3�1 and K3�2 immediately switch.

5- When K3�1 closes, optional economizer dampers open to allow minimum air exchange dur�ing the call for heat.


7- On a call for 2nd stage heat (thermostat W1 and W2), optional electric heat is energized inaddition to the compressor, defrost control, outdoor fan and indoor blower. Second stagedemand energizes heat relay K43. Contacts K43�1 immediately close.

8- When K43�1 closes, heat relays K15, K16 and K17 are energized. K15�1, K16�1 and K17�1close immediately.

9- When K43�2 closes, nothing happens (since blower relay K3 is energized K3�2 remainsswitched). The indoor blower continues to operate on high speed.

10- When K15�1 closes, 15kw: heating element HE1 is energized.When K15�1 closes, 20kw or 25kw: heating element HE1 and HE2 are energized.

11- When K16�1 closes, 15kw: heating element HE2 is energized.When K16�1 closes 20kw or 25kw: heating element HE3 and HE4 are energized.

12- When K17�1 closes, 15kw: heating element HE3 is energized.When K17�1 closes, 20kw or 25kw: heating element HE5 and HE6 are energized.

13- When heating demand stops, heat relay K43 cycles off. All heating elements de�energizeimmediately.

A13 diagram with B27 diagram 5kw, 7kw, 10kw or 15kw electric heat matched to208/230V three�phase commercial heat pump

Page 104

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Page 105

A13 DIAGRAM WITH B27 DIAGRAMECH16 5kw, 7kw, 10kw or 15kw 208/230V Three�Phase Electric Heat with CHP16



Optional ECH16�5, �7, �10 and �15 three�phase electric heat units are designed for commer�cial use. These units are capable of directing optional economizer dampers to allow mini�mum fresh air exchange during electric heat operation.






2- On a call for 1st stage heat (thermostat W1), transfer relay K8 and latch relay K6 (reset) areenergized.





7- On a call for second stage heat (thermostat W1 and W2), optional electric heat is energizedin addition to the compressor, defrost control, outdoor fan and indoor blower. Second stagedemand energizes heat relay K43. Contacts K43�1 and K43�2 immediately close.

8- When K43�1 closes, heat relay K15 is energized. K15�1 closes immediately.


10- When K15�1 closes, heating elements HE1, HE2 and HE3 are energized.


A14 diagram with B27 diagram 20kw or 25kw electric heat matched to208/230V three�phase commercial heat pump

Page 106

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Page 107

A14 DIAGRAM WITH B27 DIAGRAMECH16 20kw or 25kw 208/230V Three�Phase Electric Heat with CHP16



Optional ECH16�20 and �25 three�phase electric heat units are designed for commercialuse. These units are capable of directing optional economizer dampers to allow minimumfresh air exchange during electric heat operation.











7- On a call for second stage heat (thermostat W1 and W2), optional electric heat is energizedin addition to the compressor, defrost control, outdoor fan and indoor blower. 2nd stage de�mand energizes heat relay K43. Contacts K43�1 and K43�2 immediately close.

8- When K43�1 closes, heat relay K15 and time delay DL2 are energized. K15�1 closes imme�diately. DL2 begins 30 second count before closing.

9- When 15�1 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 and HE3are connected in a �delta" configuration for three�phase operation.

10- After 30 second count, time�delay DL2 closes and energizes heating contactor K16. K16�1closes immediately.

11- When K16�1 closes, heating elements HE4, HE5 and HE6 are energized. HE4, HE5 andHE6 are connected in a �delta" configuration for three�phase operation.

12- When heating demand stops, economizer/heat relay K43 is de�energized and K43�1 andK43�2 open immediately. All three heating elements connected to K15 and the indoor blowerare de�energized simultaneously. All three heating elements connected to K16 are de�ener�gized when DL2 contacts open (about one second later).

A15 diagram with B28 diagram 7kw, 10kw, 15kw, 20kw or 25kw electric heat matchedto 460V or 575V three�phasecommercial heat pump

Page 108

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Page 109

A15 DIAGRAM WITH B28 DIAGRAMECH16 7kw, 10kw, 15kw, 20kw or 25kw 460V or 575V Three�Phase Electric Heat with CHP16



Optional ECH16�7, -10, -20 and �25 three�phase electric heat units are designed for com�mercial use. These units are capable of directing optional economizer dampers to allow mini�mum fresh air exchange during electric heat operation.











7- On a call for second stage heat (thermostat W1 and W2), optional electric heat is energizedin addition to the compressor, defrost control, outdoor fan and indoor blower. 2nd stage de�mand energizes heat relay K43. Contacts K43�1 and K43�2 immediately close.

8- When K43�1 closes, heat relay K15 is energized. K15�1 closes immediately.


10- When K15�1 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 andHE3 are connected in a �wye" configuration for three�phase operation.


Page 110

A15 DIAGRAM WITH B28 DIAGRAM

ECH16 7kw, 10kw, 15kw, 20kw or 25kw 460V or 575V Three-Phase Electric Heat with CHP16

14–A15 SECTION with B28 SECTION

This section explains the operation sequence of optional electric heating units. Ther-mostat and optional economizer wiring diagrams are omitted from this section in or-der to simplify the operation sequence.Optional ECH16-7, –10, –20 and -25 three-phase electric heat units are designed forcommercial use. These units are capable of directing optional economizer dampers toallow minimum fresh air exchange during electric heat operation.The ECH16 unit plugs in to the CHP16 using jackplugs J2/P2. No field wiring is re-quired.NOTE- This operation sequence assumes the use of a conventional 2 cool / 2 heat(non-heat pump) thermostat.


NOTE–This operation sequence emphasizes electric heat operation. Thermostat dia-gram has been omitted.

1– When disconnect is closed, line voltage is supplied to unit controls and indoor ther-mostat.

2– On a call for first stage heat (thermostat W1), transfer relay K8 and latch relay K6 (re-set) are energized.

3– When K6 (reset) is energized, the compressor, defrost control and outdoor fan are en-ergized.

4– When transfer relay K8 is energized, K8-1 contacts switch and blower relay K3 is ener-gized. K3-1 and K3-2 immediately switch.

5– When K3-1 closes, optional economizer dampers open to allow minimum air ex-change during the call for heat.

6– When K3-2 switches, the indoor blower is energized on high speed. 7– On a call for second stage heat (thermostat W1 and W2), optional electric heat is ener-

gized in addition to the compressor, defrost control, outdoor fan and indoor blower.2nd stage demand energizes heat relay K43. Contacts K43-1 and K43-2 immediatelyclose.

8– When K43-1 closes, heat relay K15 is energized. K15-1 closes immediately. 9– When K43-2 closes, nothing happens (since blower relay K3 is energized K3-2 remains

switched). The indoor blower continues to operate on high speed. 10– When K15-1 closes, heating elements HE1, HE2 and HE3 are energized. HE1, HE2 and

HE3 are connected in a “wye” configuration for three-phase operation. 11– When heating demand stops, heat relay K43 cycles off. All heating elements de-ener-

gize immediately.

Documents

CHP16 SERIES UNITS - LENNOX EMEAwebmanuals.lennoxeurope.com/Out of Production...CHP16 series units in the 2-5 ton sizes were introduced in the spring of 1990. The single package cooling