AIR CONDITIONERS - Kühlen, Heizen und Lüften / …...8-2 Features of air-conditioner for computer room 8-3 Step-by-Step Plan for the Implementation of the Air-Conditioning 8-4 Conditions

Model PUHY-P250YHM-APFD-P250VM-EPFD-P500VM-E

DATA BOOK

AIR CONDITIONERS

CONTENTS

1. Specifications1-1 Main Features1-2 List of Possible Combinations of Indoor and Outdoor Units1-3 Unit Specifications

2. Capacity Curves2-1 Cooling Capacity2-2 Cooling Input2-3 Part Load Performance2-4 SHF Curves2-5 Correction by refrigerant piping length2-6 Operation limit

3. Sound Levels3-1 Noise Level3-2 NC Curves3-3 Fan Characteristics Curves

4. External Dimensions 5. Electrical Wiring Diagrams 6. Refrigerant Circuit Diagram And Thermal Sensor 7. System Design

7-1 Refrigerant Piping System7-2 Control Wiring7-3 Types of switch settings and setting methods7-4 Sample System Connection7-5 External input/output specifications7-6 System Rotation Control7-7 Notes on the use of optional accessories

8. Air Conditioning the Computer Room8-1 Main Features of the Floor-Duct Air Conditioners8-2 Features of air-conditioner for computer room8-3 Step-by-Step Plan for the Implementation of the Air-Conditioning8-4 Conditions for the Installation of Computer-Room Air Conditioners 8-5 Setting the Air conditioners8-6 Automatic Control of the Computer Room

9. Maintenance/Inspection9-1 Maintenance/Inspection Schedule

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35353536373840

4141

Close controlPUHY-P-YHM-APFD-P-VM-E

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1. Specifications1-1.Main Features

1

(1) List of Models

<10HP System>

<20HP System>

PUHY-P250YHM-A

10HP(Down flow): PFD-P250VM-E20HP(Down flow): PFD-P500VM-E

✻ PFD-type indoor units cannot be connected to outdoor units other than the ones specified above.✻ PFD-type indoor units and other types of indoor units cannot coexist in the same refrigerant system.✻ It is necessary to change pulley and V-belt when using it by the power supply frequency 60Hz.✻ For restrictions when the PFD-type indoor units are connected (related to the system), see P20.

When using a PFD-P250VM-E as an indoor unit, connect an outdoor unit PUHY-P250YHM-A to eachindoor unit and operate with a built-in remote control for the indoor unit.✻1: Bold line indicates refrigerant piping (gas/liquid). This system consists of single refrigerant circuit.✻2: Indicates TB3-type transmission line that connects the indoor and outdoor units.

This system consists of single refrigerant circuit.✻3: Indicates TB7-Type transmission line that allows the unit to communicate with the controller.

Outdoor Unit

} Indoor Unit

Outdoor Unit

G-50APUHY-P250YHM-A

Indoor Unit

PFD-P250VM-E

TB7 TB3 ✻2✻3

✻112V DC

M-NET

PAC-SC50KUA

UP

POWER RATING

MODEL

WEIGHT

SERIAL No.

2.11kg

POWER SUPPLY UNIT

MITSUBISHI ELECTRIC CORPORATION

PAC-SC50KUA

When using a PFD-P500VM-E as an indoor unit, connect 2 PUHY-P250YHM-A outdoor units toeach indoor unit and operate with a built-in remote control for the indoor unit.At factory shipment, this model of indoor unit is designed and set to accommodate a single refriger-ant circuit. Connection of two refrigerant circuits to the indoor unit requires setting change and pipe work.✻1: Bold line indicates refrigerant piping (gas/liquid). This system consists of two refrigerant circuits.✻2: Indicates TB3-type transmission line that connects the indoor and outdoor units.

This system consists of two refrigerant circuits.✻3: Indicates TB7-type transmission line that allows the unit to communicate with the controller.

Outdoor Unit

PUHY-P250YHM-A

Indoor UnitPFD-P500VM-E

TB7 TB3 ✻2

✻1

TB3

PUHY-P250YHM-A

TB7✻3

G-50A

12V DC

M-NET

PAC-SC50KUA

UP

POWER RATING

MODEL

WEIGHT

SERIAL No.

2.11kg

POWER SUPPLY UNIT

MITSUBISHI ELECTRIC CORPORATION

PAC-SC50KUA

Two refrigerant circuits

2

1-2. List of Possible Combinations of Indoor and Outdoor Units

✻1: Refer to the following pages for detailed specifications of each unit.✻2: They were measured at operation under the following conditions:

<Cooling> Indoor:27˚CDB/19˚CWB Outdoor:35˚CDB<Heating> Indoor:20˚CDB Outdoor: 7˚CDB/6˚CWB

Pipe length:7.5m, Height difference:0m

Model Name Indoor unit

Outdoor unit

Cooling Heating

System capacity kW 28.0 31.5

System Power input kW 9.3 9.1

System current A 16.7/15.9/15.4 16.4/15.5/15.1

10HP system

PFD-P250VM-E

PUHY-P250YHM-A

Cooling Heating

56.0 63.0

18.6 18.2

32.3/30.8/29.7 31.7/30.0/29.1

20HP system

PFD-P500VM-E

PUHY-P250YHM-A x 2

(2) Indoor Unit

3

1-3. Unit Specifications

28.0 31.53N ~ 380/400/415V 50/60Hz

Capacity

Model name

kWPower source

✻ 1

✻ 2

kWA

m3/minkW

kWkW

mm

dB(A)kg

Power inputCurrentFan

Airflow rateType ✕ Quantity

Motor outputTypeMotor outputCrankcase heater

Compressor

Refrigerant / LubricantExternal finish

High pressure protection

Inverter circuit (COMP./FAN)

CompressorFan

External dimension H x W x DProtectiondevices

Refrigerant piping diameter

High press. pipeLow press. pipe

Noise levelNet weight

1,710 (without legs 1,650) x 920 x 760

Propeller fan x 11850.46

Hermetic6.7

0.035 x 1

R410A/MEL32Heat exchanger Salt resistant fin

Over-heat protection, Over current protection ø9.52 Brazed (ø12.7 for over 90m)

ø22.2 Brazed

Pre-coated galvanized steel sheets (+ powder coating for -BS type) <MUNSEL 5Y 8/1 or similar>

High pres. Sensor & High pres. Switch at 4.15MPa

200

6.66.811.1/10.5/10.211.4/10.9/10.5

PUHY-P250YHM-A (-BS)connected with PFD series

Over heat protectionThermal switch

57

Cooling Heating

Note: *1. Cooling/Heating capacity indicates the maximum value at operation under the following condition.

*2. It is measured in anechoic room.** Installation/foundation work, electrical connection work, duct work, insulation work, power source switch,

and other items shall be referred to the Installation Manual.

Indoor : 27˚CDB / 19˚CWBIndoor : 20˚CDBPipe length : 7.5m

Outdoor :Outdoor :Height difference : 0m

35˚CDB7˚CDB / 6˚CWB

<Cooling><Heating>

3N~380/400/415V(50Hz), 400/415V(60Hz)

PFD-P500VM-E

5.0Power source

kW

-

Power input

System capacity

A

m3/minPa

kg

dB(A)m

mm

Current

Heat exchanger

Fan

RefrigerantExternal finish

Type x QuantityAirflow rateExternal static pressure

kWMotor Output

Air filter

Refrigerant piping diameter✻ 2

Refrigerant piping allowable length

Gas pipeLiquid pipe

Cross fin (Aluminum plate fin and copper tube)

Sirocco fan x 2Sirocco fan x 1

ø 9.52 Brazed (ø 12.7 for over 90m)ø 22.2 Brazed

Single refrigerantcircuitTwo refrigerantcircuit

320

1,950 x 1,380 x 780

9.5/9.0/8.7

PFD-P250VM-E

2.5

kW 28.0 31.5 56.0 63.0

5.3/5.0/4.9

1601201204.42.2

380

59150

Gas pipeLiquid pipe ø 15.88 Brazed

ø 28.58 Brazed

Gas pipeLiquid pipe ø 9.52 Brazed (ø 12.7 for over 90m)

ø 22.2 Brazed

520

63150

R410AGalvanized steel plate (with polyester coating)

<MUNSEL 2.9GY 8.6/0.3(White) 7.2GB 3.2/5.3(Blue) or similar>

PP Honeycomb fabric (washable)

Thermal switch1,950 x 1,980 x 780

Protection devices (Fan)External dimensions H x W x D

Model name

Noise level

Net weight

Cooling Heating ✻ 1 ✻ 1Cooling Heating

Note: *1. Heating can be used only by the indoor warming-up.*2. At factory shipment, this model of indoor unit is designed and set to accommodate a single refrigerant circuit.

Connection of two refrigerant circuits to the indoor unit requires setting change and pipe work.** Installation/foundation work, electric connection work, duct work, insulation work, power source switch and other items are

not specified in the specifications.

(1) Outdoor Unit

4

2. Capacity Curves2-1. Cooling Capacity

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

-15 -10 -5 0 5 10 15 20 25 30 35 40 45

Indoor unit inlet temperature (˚CWB)

Indoor unit inlet temperature (˚CWB)

19

15

12

24

0.7

0.8

0.9

1.0

1.1

1.2

1.3

19

24

15

12

-15 -10 -5 0 5 10 15 20 25 30 35 40 45

Cap

acity

cor

rect

ion

coef

ficie

ntIn

put C

orre

ctio

n C

oeffi

cien

t

Outdoor unit inlet temperature (˚CDB)

Outdoor unit inlet temperature (˚CDB)

2-2. Cooling Input

✻ The correction curves indicate the values measured at the point where the compressor wasoperated at its maximum capacity.

✻ indicates the standard value.

2-3. Part Load Performance

5

10HP SystemIndoor Unit : PFD-P250VM-EOutdoor Unit : PUHY-P250YHM-A

CoolingCapacity (kW)

100%Capacity

90%Capacity

80%Capacity

70%Capacity

60%Capacity

50%Capacity

40%Capacity

40 ˚C 26.6 10.05 8.75 7.68 6.79 6.08 5.50 5.0435 ˚C 28.0 9.30 8.11 7.18 6.41 5.82 5.13 4.6030 ˚C 29.4 8.65 7.61 6.81 6.17 5.50 4.94 4.5225 ˚C 30.2 8.10 7.21 6.56 6.00 5.38 4.89 4.5020 ˚C 31.1 7.72 6.92 6.26 5.74 5.27 4.85 4.4715 ˚C 31.6 7.54 6.87 6.31 5.80 5.35 4.94 4.56

* Indoor air temperature condition: 27˚CDB/19˚CWB

20HP SystemIndoor Unit : PFD-P500VM-EOutdoor Unit : PUHY-P250YHM-A ✕ 2

CoolingCapacity (kW)

100%Capacity

90%Capacity

80%Capacity

70%Capacity

60%Capacity

50%Capacity

40%Capacity

30%Capacity

40 ˚C 53.2 20.09 17.46 15.24 13.49 12.08 10.94 10.07 8.3735 ˚C 56.0 18.60 16.19 14.30 12.77 11.51 10.11 9.05 8.0630 ˚C 58.8 17.30 15.24 13.58 12.24 10.79 9.76 8.92 7.6825 ˚C 60.5 16.19 14.47 13.06 11.79 10.59 9.67 8.79 7.5520 ˚C 62.2 15.44 13.88 12.53 11.42 10.48 9.64 8.52 7.4915 ˚C 63.3 15.07 13.83 12.63 11.58 10.67 9.84 8.62 7.64

* Indoor air temperature condition: 27˚CDB/19˚CWB

Outdoor unit inlettemp. (˚CDB)

System Power input (kW)

Outdoor unit inlettemp. (˚CDB)

System Power input (kW)

6

2-4. SHF Curves

Operation Temparature Range: Indoor : 12˚CWB~24˚CWB Outdoor : -15˚CDB~43˚CDB (RH : 30~80%)

Standard Point " " : Indoor : 27˚CDB/19˚CWB Outdoor : 35˚CDB/-

0.4

0.5

0.6

0.7

0.8

0.9

1

30 40 50 60 70 80

RH (%)

SH

F

130% 120%110%100% 90% 80% 70%

Standard Capacity Ratio


0.93

0.4

0.5

0.6

0.7

0.8

0.9

1

30 40 50 60 70 80

RH (%)

SH

F

130% 120%110%100% 90% 80% 70%

35 45 55 65 75

Indoor Temperature 27˚CDB

35 45 55 65 75


7

Operation Temparature Range: Indoor: 12˚CWB~24˚CWBOutdoor: -15˚CDB~43˚CDB(RH: 30~80%)

0.4

0.5

0.6

0.7

0.8

0.9

1

30 40 50 60 70 80

RH (%)

SH

F

120% 110% 100% 90% 80% 70%



0.4

0.5

0.6

0.7

0.8

0.9

1

30 40 50 60 70 80

RH (%)

SH

F

120% 110%100% 90% 80% 70%

35 45 55 65 75


35 45 55 65 75


8

2-5. Correction by refrigerant piping length

To obtain a decrease in cooling/heating capacity due to refrigerant piping extension, multiply by the capacitycorrection factor based on the refrigerant piping equivalent length in the table below.

• Cooling

Equivalent length = (Actual piping length to the farthest indoor unit) + (0.50 ✕ number of bent on the piping)m• How to obtain piping equivalent length

Piping equivalent length (m)

Cap

acity

cor

rect

ion

coef

ficie

nt

0.7

0.8

0.9

1

0 20 40 60 80 100 120 140 160 180

2-6. Operation limit

Indo

or te

mpe

ratu

re (

˚CW

B)

-15 0-5-10 5 10 15 20 25 30 35 40 451012

15

20

25

30

* The height between the Outdoor PUHY-P-YHM-A and Indoor could make the running temperature range narrow. For details refer to P19, 7-1 Refrigerant Piping System.

Outdoor temperature (˚CDB)

• Heating

Outdoor temperature (˚CWB)

Indo

or te

mpe

ratu

re (

˚CD

B)

30

25

20

15

10

5-20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50

9

3. Sound Levels3-1. Noise Level

1m

1m

Measurementlocation

SeriesNoise Level

(dB [Type A])

PFD-P250VM-E 59

PFD-P500VM-E 63

(1) Outdoor Unit

(2) Indoor Unit

Measurement location

1m

1m

SeriesNoise Level

(dB [Type A])

PUHY-P250YHM-A 57

10

3-2. NC Curves

PUHY-P250YHM-A

PFD-P250VM-E (External static pressure 120Pa) PFD-P500VM-E (External static

pressure 120Pa)63Hz 125Hz 250Hz 500Hz 2000Hz1000Hz 4000Hz 8000Hz dB(A)

82.8 70.5 65.6 57,0 55.1 51.1 44.7 37.9 63

(External static pressure 0Pa)

63Hz 125Hz 250Hz 500Hz 2000Hz1000Hz 4000Hz 8000Hz dB(A)

70.6 62.7 60.5 56.1 54.8 45.7 39.7 32.9 59

63Hz 125Hz 250Hz 500Hz 2000Hz1000Hz 4000Hz 8000Hz dB(A)

10

20

30

40

50

60

70

80

90

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz10

20

30

40

50

60

70

80

90

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz

10

20

30

40

50

60

70

80

90

63Hz 125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OC

TAV

E B

AN

D P

RE

SS

UR

E L

EV

EL

(dB

) 0

dB =

20µ

Pa

OCTAVE BAND CENTER FREQUENCIES (Hz)

OC

TAV

E B

AN

D S

OU

ND

LE

VE

L (d

B)


OC

TAV

E B

AN

D P

RE

SS

UR

E L

EV

EL

(dB

) 0

dB =

20µ

Pa


Approximate minimum audible limit on continuous noise



Standard 35.0 57.0

NightMode 44.0 When Night Mode is set,the A/C system's capacity is limited. The system could return to normal operation from ��ht Mode automaticall in the case that the operation condition is severe.

50/60Hz

50/60Hz

59.0 62.0 60.0 54.0 50.5 46.0 41.024.558.0 53.5 44.0 39.0 36.5 32.5 31.0

Standard 50/60HzNight Mode 50/60Hz

11

3-3. Fan Characteristics Curves

PFD-P250VM-E

PFD-P500VM-E

: 50/60Hz, standard

: 50/60Hz, standard

0

100

200

300

400

500

600

700

800

900

1000

130 140 150 160 170 180 190

)a

P(er

usser

pcit

atsla t

oT

Fan rotation speed

Internalresistance

1200rpm

1100rpm

1000rpm

900rpm

800rpm

Output 3.7kW

136 184

Air volume (m3/min)

Air volume (m3/min)

✻ Pulley and V-belt is procured on site.

✻ Pulley and V-belt is procured on site.

290 310 330 350318 345

250

0

100

200

300

400

500

600

700

800

270

)a

P(er

usser

pcit

atslat

oT

272

800rpm800rpmInternal resistance

Fan rotation speedOutput 5.5kW

StandardStandard

1000rpm

1100rpm

1000rpm

900rpm900rpm

12

34

5

6

7

8

9

3

4

5

6

7

8

9

2

6

No.

3

4

5

6

7

8

9

No.

1

3

4

5

7

8

9

1170114010801040973930845797748

Rotational speed (rpm)

113510701015978905850803

Rotational speed (rpm)

ø315-B-2-42ø315-B-2-42

ø250-B-2-42ø250-B-2-42ø280-B-2-42

50Hz

Motor pulley Fan pulley

ø170-B-2-38

ø180-B-2-38ø170-B-2-38

ø180-B-2-38ø180-B-2-38

ø160-B-2-38

ø170-B-2-38

ø236-B-2-42ø250-B-2-42

50Hz


ø160-B-2-28

ø160-B-2-28

ø170-B-2-28

ø165-B-2-28ø165-B-2-28ø165-B-2-28ø165-B-2-28ø170-B-2-28ø160-B-2-28

ø315-B-2-42

ø280-B-2-42

ø200-B-2-42ø212-B-2-42ø224-B-2-42ø236-B-2-42

ø280-B-2-42

ø315-B-2-42

ø250-B-2-42

B48B49B50B51B52B54B54B57B56

V-belte

B51B51B51B50B53B56B55

V-belte

60Hz


ø280-B-2-42

ø165-B-2-28

ø165-B-2-28ø165-B-2-28

ø180-B-2-28ø170-B-2-28

ø355-B-2-42

ø250-B-2-42ø280-B-2-42ø280-B-2-42

-ø160-B-2-28

ø160-B-2-28ø170-B-2-28

ø300-B-2-42ø315-B-2-42

ø355-B-2-42-

ø300-B-2-42ø180-B-2-38

ø355-B-2-42ø355-B-2-42ø160-B-2-38

60Hz

Fan pulleyMotor pulley

ø160-B-2-38 ø250-B-2-42

ø280-B-2-42ø300-B-2-42

ø170-B-2-38

ø160-B-2-38ø160-B-2-38ø160-B-2-38 ø315-B-2-42

B52B56B54B54B55B56B60B59

-

V-belte

B50B55B52B54B55B58B58

V-belte

12

4. External Dimensions

PUHY-P250YHM-A(-BS) Unit : mm

172

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ppro

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Air

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peci

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ect t

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V1

SV

1a

63H

1

21S

4a

ST

3

ST

6

63H

S1

CJ2

ST

7

AC

CT

H4

TH

2

TH

3

TH

7

TH

6

21S

4b

TH

5

CP

1

CJ1

63LS

SV

5b

CV

1

LEV

2a

LEV

2b

ST

1

ST

2

BV

1

SV

9C

P2

BV

2

O/S

CO

MP

TH

23

TH

22

Indoor Unit : PFD-P250VM-E

19

Outdoor Unit : PUHY-P250YHM-A x 2Indoor Unit : PFD-P500VM-E

SCC(HIC circuit)

SCC(HIC circuit)

LEV1

SV1a

63H1

21S4a

ST3

ST6

63HS1 CJ2

ST7

ACCTH4

TH2

TH3

TH7

21S4b

TH5

CP1

CJ1

63LS

SV5b

CV1

LEV2a

LEV2b

ST1

ST2

BV1

SV9 CP2

BV2

O/S

COMP

LEV1

SV1a

63H1

21S4a

ST3

ST6

63HS1 CJ2

ST7

ACCTH4

TH6

TH6

TH2

TH3

TH7

21S4b

TH5

CP1

CJ1

63LS

SV5b

CV1

LEV2a

LEV2b

ST1

ST2

BV1

SV9 CP2

BV2

O/S

COMP

TH23-1

TH22-1 TH22-2

TH23-2

20

7. System Design7-1.Refrigerant Piping System

■ Sample connection

■ Pipe selection

■ Amount of refrigerant charge

Refrigerant for extension piping is not included at factory shipment. Add an appropriate amount of refrigerant for each system on site. Write down the size and the length of the piping in each system as well as the amount of added refrigerant on the outdoor unit as a reference for servicing.

■ Calculating the amount of refrigerant to be added

• The amount of refrigerant that is necessary for extension piping is calculated based on the size and the length of the liquid piping.

• Use the following formula to figure out the amount of refrigerant to be added.• Round up the calculation result to the nearest 0.1 kg. (e.g., If the result is 16.08 kg, round up the .08 to .1 , which

yields 16.1 kg.)

CautionCharge Liquid Refrigerant

Filling the equipment with gas refrigerant will result in a power loss due to transformation of refrigerant in the tank.

✻ Refrigerant charge calculation

✻ Amount of charged refrigerant at factory shipment ✻Sample calculation

Outdoor unit model

Chargedrefrigerant amount(kg)

9.0P250

Outdoor unit

L

L

H

A

Outdoor unit

L

H

A

Indoor unit Indoor unit

Liquid pipe size

Total length of the ø 12.7 pipes x 0.12

Liquid pipe size

Total length of the ø 9.52 pipes x 0.06

(m) x 0.12(kg/m)

+(m) x 0.06(kg/m)

+

Total capacity of connected indoor units Amount for the indoor unit

P250 model 2.0kg

✻ 2 kg x 2 when connected to a system with two outdoor units

P500 model4.0kg

500 model indoor unit : When ø 9.52 pipes are used and the piping length is 80 m80(m) x 0.06(kg/m)+2.0kg=6.8kg

(Amount for the extension pipe to each outdoor unit)

<Connection to a system with two outdoor unit>

Farthest piping length(L)

Height difference between indoor and outdoor units (H)

50 m or less (40 m if outdoor unit is below indoor unit, 15 m if outside temperature is 10˚C or below)

165 m or less in actual lengthAllowable piping lengthAllowable height difference

<Refrigerant system with one outdoor unit>

<Amount of refrigerant to be added>

<Refrigerant system with two outdoor units>

Outdoor unit model Liquid pipe size Gas pipe sizeP250

✻1 Use ø 12.7 pipes when the pipe length exceeds 90 m.ø 9.52 ✻1 ø 22.2

21

7-2.Control Wiring

Restrictions when the PFD-type indoor units are connected (related to the system)

(1) Specifications of control wiring and maximum length of wiring

Transmission line is a type of control line. When the source of noise is located adjacent to the unit, theuse of shield cable as well as moving the unit as far away from the noise source are recommended.

1 Transmission line (M-NET transmission line)

For multiple-refrigerant system

Length of transmission line

Facility type(noise level measurement)

No. of cable 2-core cable

Diameter Over 1.25mm2

Wiring specifications

All types of facilities

n/a

Shield cableCVVS · CPEVS · MVVS

System component

Maximum length: 200mMaximum length of centralized control transmission line and Indoor/Outdoortransmission line via indoor/outdoor units: 500m maximum

Total length of indoor/outdoor transmission line

Cable type

(1) The PFD-type indoor units cannot be connected to the ME remote controller.(2) The address settings must be made on this system.(3) The following functions cannot be selected on the PFD-type indoor units.

1) Switching between automatic power recovery Enabled/Disabled (Fixed to "Enabled" in thePFD-type indoor units)

2) Switching between power source start/stop (Fixed to "Disabled" in the PFD-type indoor units)(4) The PFD-type indoor units and other types of indoor units cannot be grouped.(5) The following functions are limited when the system controller (such as G-50A) is connected.

1) To perform group operation in the system with two refrigerant circuits (combination of two out-door units and one indoor unit: P500 model only), the addresses of the controller boards No.1and No.2 on a indoor unit must be set within a group.

2) The local operation cannot be prohibited with the system controller.3) When the switches of the PFD-type indoor units are set as follows, the unit ON/OFF operation

cannot be made with the system controller.· When the Normal/Local switching switch is set to "Local"· When the DipSW1-10 on the control circuit board is set to "ON"

4) The PFD type indoor units cannot be grouped with other types of indoor units.

22

(1) Address setting

7-3.Types of switch settings and setting methodsWhether a particular system requires switch settings depends on its components. Refer to the section “7-4 Sample System Connection” before conducting electrical work.Keep the power turned off while setting the switches. If settings are changed while being powered, thechanged settings will not register, and the unit may malfunction.

Symbol

Outdoor unit OC

Indoor unit

✻ 10HP has only the main controller

Main/sub controllers ✻ IC

Turn off the power to

Outdoor unit

Indoor and outdoor units

Unit

2 Remote control wiring

MA remote controller ✻ 1

No. of cable 2-core cable

Diameter0.3~1.25mm2

(0.75~1.25mm2)✻ 2✻ 3

Wiring specifications

VCTF · VCTFK · CVV · CVS · VVR · VVF · VCT

Maximum length: 200 mTotal Length

✻ 1: “MA remote controller” includes MA remote controller, Simple MA controller, and wireless remote controller.✻ 2: Cables with a diameter of 0.75mm2 or smaller recommended for easier handling.✻ 3: When connecting to Simple MA controller terminal, use a cable with a diameter within the range shown in

the parenthesis.

Cable type

The need for address settings and the range of address setting depend on the configuration of the sys-tem. Refer to “Sample System Connection”.

SymbolUnit or controller

Main · SubIndoor unit

MA remote controller

Addresssetting range

IC01~50

(Note 1)

Address setting methodFactory setting

No address setting required.

00

00

MA

Outdoor unit OC

Main

51~100

Model

In case of 10HP system, assign an odd number starting with "01". In case of 20HP system with two refrigerant circuits, assign a sequential odd number starting with "01" to the upper indoor controller, and assign "the address of the upper indoor controller + 1" to the lower indoor controller.(For the system with one refrigerant circuit, the lower circuit board is not used.)

Add 50 to the address assigned to the indoor unit connected the system with one outdoor unit.

(The main/sub switch must be configured if two remote controllers are connected to the system or if the indoor units are connected to different outdoor units.)

(Note1) If a given address overlaps any of the addresses that are assigned to other outdoor units, use a different, unused address within the setting range.

23

(5) Connection of two refrigerant circuits

When two refrigerant circuits are connected on site, make the switch settings on the controller circuitboard following the instructions described in the installation manual for the indoor unit.

(4) Setting the MA “Sub” controller

When using two remote controllers or running two indoor units as a group, one of the controllers must beset to “Sub” controller.✻ No more than two remote controllers can be connected to a group.

(Factory setting: “Main”)Set the controller according to the following procedure. Refer also to the instructions manual supplied withthe MA remote controller.

Remote controller bodyDip switches

1

ON

2 3 4

Screwdriver

Remove the cover on the remote controller

Set Dip Switch No.1 on the remotecontroller to “OFF” (Main to Sub)

Insert a flat-head screwdriver in the groove shown in the picture, and move the screwdriver in the direction shown in the arrow.

(3) Choosing the temperature detection spot by indoor unit (Factory Setting: SWC “Standard”)

When using the suction temperature sensor, set SWC to “Option.”(The discharge temperature sensor is supplied as standard specification.)

(2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.)

Systemconfiguration

Power supply switch connector connection

Not connectedNot grouped

Grouped

Required

Grouped/Not grouped

Grouped/Not grouped

Grouped/Not grouped

Not required

Leave the male connector on CN41 as it is. (Factory setting)

Leave the male connector on CN41 as it is. (Factory setting)

System in which indoor units connected to one

outdoor unit

Connection to the system controller

With connection to indoor-outdoor transmission line

With connection to transmission

line for centralized control

Power supply unit for transmission

lines

Not required (Powered from

the outdoor unit)

Grouping the indoor units connected to different outdoor

units

System in which indoor units connected to

multiple outdoor unitsDisconnect the male connector from the female power supply switch connector (CN41) and connect it to the female power supply switch connector (CN40) on only one of the outdoor units (OC).*Connect the S (shielded) terminal on the terminal block (TB7) on the outdoor unit whose male connector on CN41 was disconnected and connected to CN40 to the earth terminal ( ) on the control box.

✻ When the system controller is connected to the indoor/outdoor transmission line and the power is supplied from the outdoor unit, do not to turn off the outdoor unit. If its power supply is cut, the power is not supplied to the system controller, and the functions will not work.

24

7-4.Sample System Connection

(1) An example of a system to which an MA remote controller is connected

Control Wiring Diagram

Notes Maximum Allowable Length

Wiring and Address Setting

OC

TB3TB7M1 M2 M1 M2S

51

IC

TB5-1A1 B1 S

01

TB5-2A2 B2 S

02

A B

TB151 2

MA

L1Leave the male connector on CN41 as it is.

1. Leave the male connector on the female power supply switch connector (CN41) as it is.2. Grounding to S terminal on the terminal block for transmission line for centralized

control (TB7) is not required.3. Although two indoor controllers (controller circuit boards) are equipped inside the

indoor unit (20HP), the board on No.2 side (lower side) is not used. Do not connect wiring to the lower controller circuit board.

4. The outdoor unit cannot be connected to the units other than the PFD series indoor units.

<a. Indoor/Outdoor transmission line>Connect M1, M2 terminals of the indoor/outdoor transmission line terminal block (TB3) on the outdoor unit (OC) and A1, B1 terminals of the indoor/outdoor terminal block (TB5-1) on the indoor unit (IC). (Non-polarized 2-core cable) *Only use shielded cables.[Shielded cable connection]Connect the earth terminal of the OC and S terminal of the IC terminal block (TB5-1).

<b. Switch setting>Address setting is required as follows.

Main Controller

Sub Controller Settings to be made with the sub/main switch

IC

IC

OC

1

2

Notes

3MA

MA

51~100

01~50

01~50

00

00

Setting not required.

Sub Controller

✻ One indoor controller (controller circuit board) is equipped in the indoor unit (10HP), and two indoor controllers (controller circuit boards) are equipped in the indoor unit (20HP).

<a. Indoor/Outdoor transmission line>Maximum Length (1.25mm2 or more)

L1 200m

Ste

ps Unit or controller

Main

Sub

Indoorunit

MAremotecontroller


Address setting method

Outdoor unit

Factorysetting

Main

Assign a sequential odd number starting with "01" to the upper indoor controller.

Add 50 to the address assigned to the indoor unit connected to the system with one outdoor unit.

Assign sequential numbers starting with the address of the main unit in the same group. (Main unit address +1)

1 System connected to one outdoor unit

25




Leave the male connector on CN41 as it is.

1. Assign a sequential number to the outdoor unit.2. Do not connect the terminal blocks (TB5) of the indoor units connected to different

outdoor units.3. Disconnect the male connector on the controller board from the female power supply

switch connector (CN41), and connect it to the female power supply switch connector (CN40) on only one of the outdoor units.

4. Provide grounding to S terminal on the terminal block for transmission line for centralized control (TB7) on only one of the outdoor units.

5. When the power supply unit is connected to the transmission line for centralized control, leave the male connector on the female power supply switch connector (CN41) as it is at factory shipment.


<a. Indoor/Outdoor transmission line>Connect M1, M2 terminals of the indoor/outdoor transmission line terminal block (TB3) on the outdoor unit (OC) and A1, B1 terminals of the indoor/outdoor terminal block (TB5-1) on the indoor unit (IC). (Non-polarized 2-core cable) *Only use shielded cables.[Shielded cable connection] Connect the earth terminal of the OC and S terminal of the IC terminal block (TB5-1).

<b. Transmission line for centralized control> Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on each outdoor unit (OC).Disconnect the male connector on the controller board from the female power supply switch connector (CN41), and connect it to the female power supply switch connector (CN40) on only one of the outdoor units. *Only use shielded cables.[Shielded cable connection] To ground the shielded cable, daisy-chain the S-terminals on the terminal block (TB7) on each of the outdoor

units. Connect the S (shielded) terminal on the terminal block (TB7) on the outdoor unit whose male connector on CN41 was disconnected and connected to CN40 to the earth terminal ( ) on the electric box.

<c. Switch setting>Address setting is required as follows.

Main Controller


IC

IC

OC

1

2

Notes

3MA

MA

51~100

01~50

01~50

00

00


Sub Controller


<a. Indoor/Outdoor transmission line>Maximum Length (1.25mm2 or more)

L1, L2 200m<b. Transmission line for centralized control>

Maximum Length via outdoor unit (1.25mm2 or more)L1 + L31 + L2 500m

Ste


Main

Sub

Indoorunit

MAremotecontroller



Outdoor unit

Factorysetting

Main




OC

TB3TB7M1 M2M1M2 S

51

IC

TB5-1A1 B1 S

01

TB5-2A2B2 S

02

OC

TB3TB7M1M2M1M2 S

52

A B

TB151 2

MA

L31

L1

L2

Connection

Disconnect the male power supply connector from CN40 and connect it to CN41.

not connect

(1) An example of a system to which an MA remote controller is connected2 System connected to two outdoor units

26

(1) An example of a system to which an MA remote controller is connected




Leave the male connector on CN41 as it is. OC

TB3TB7M1 M2M1 M2 S

51

IC

TB5-1A1 B1 S

01

TB5-2A2 B2 S

02

A B

TB151 2

MA(Main)

A B

MA(Sub)

L1

A1 B2

MA

m1m2



indoor unit, the board on No.2 side (lower side) is not used. Do not connect wiring to the lower controller circuit board.

4. No more than two MA remote controllers (including both main and sub controllers) can be connected to a group of indoor units. If three or more MA remote controllers are connected, remove the wire for the MA remote controller from the terminal block (TB15).


<a. Indoor/Outdoor transmission line>Same as (1) 1.

<b. MA remote controller wiring>[When two remote controllers are connected to the system]When two remote controllers are connected to the system, connect terminals 1 and 2 of the terminal block (TB15) on the indoor unit (IC) to the terminal block on the MA remote controllers (option).*Set the Main/Sub switch on the connected MA remote controllers (option) to SUB.(See the installation manual for the MA remote controller for the setting method.)


Main Controller


IC

IC

OC

1

2

Notes

3MA

MA

51~100

01~50

01~50

00

00


Sub Controller



<b. MA remote controller wiring>Maximum overall length (0.3-1.25mm2 or more)

m1 + m2 200m

Ste


Main

Sub

Indoorunit

MAremotecontroller



Outdoor unit

Factorysetting

Main




3 System in which two MA remote controllers are connected to one indoor unit

27






indoor unit, the board on No.2 side (lower side) is not used. Do not connect wiring to the lower controller circuit board.

4. No more than two MA remote controllers (including both main and sub controllers) can be connected to a group of indoor units. If three or more MA remote controllers are connected, remove the wire for the MA remote controller from the terminal block (TB15).



<b. MA remote controller wiring>[Group operation of indoor units]To perform a group operation of indoor units (IC), daisy-chain terminals 1 and 2 on the terminal block (TB15) on all indoor units (IC). (Non-polarized 2-core cable)*Set the Main/Sub switch on one of the MA remote controllers to SUB.


Main Controller


IC

IC

OC

1

2

Notes

3MA

MA

51~100

01~50

01~50

00

00


Sub Controller


Ste


Main

Sub

Indoorunit

MAremotecontroller



Outdoor unit

Factorysetting

Main




OC

TB3TB7M1M2M1M2 S

51

IC

TB5-1A1 B1 S

01

TB5-2A2 B2 S

02

A B

TB151 2

MA(Main) MA(Sub)

L1Leave the male connector on CN41 as it is. OC

TB3TB7M1M2M1 M2 S

53

IC

TB5-1A1B1 S

03

TB5-2A2 B2 S

04

A B

TB151 2

L1Leave the male connector on CN41 as it is.

m1 m2

m3


<b. MA remote controller wiring>Maximum overall length (0.3-1.25mm2 or more)

m1 + m2 + m3 200m

(1) An example of a system to which an MA remote controller is connected4 System in which two indoor units are grouped with the MA remote controller

28

(2) System with MA remote controller and G-50A




1. Be sure to use odd numbers to set the address for indoor units (10 HP and 20HP connected to the one outdoor unit).

2. To set the indoor unit address for 20 HP connected to two outdoor units, use odd numbers for the top controllers and use even numbers for the bottom controllers (Main controller plus 1).

3. Use the power supply switch connector (CN41) on the outdoor unit as is.4. It is not necessary to ground the S terminal of transmission line terminal board for

centralized controller on the outdoor unit.5 No more than two main/sub remote controllers can be connected to the indoor unit in

the same group. When more than two remote controllers are present in the system, disconnect MA remote controller from TB15 in the indoor unit.

6. Put both types of the addresses for P500-type indoor units in the same group when setting groups for indoor units with system controller (ex. G-50A).


<b. Transmission line for centralized control> Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on each outdoor unit (OC).*Only use shielded cables.[Shielded cable connection]To ground the shielded cable, daisy-chain the S-terminals on the terminal block (TB7) on each of the outdoor units.


<a. Indoor/Outdoor transmission line>L1, L2, L3 200m

<b. Transmission Line for Centralized Control >L31 + L32 + L33 + L34 + L3 500mL1 + L31 + L34 + L3 500m

<c. MA Remote Controller Line >Total Length (0.3 ~ 1.25mm2)

m1 200m

Main Controller


IC

IC

OC

1

2

Notes

3MA

MA

51~100

01~50

01~50

00

00


Sub Controller

Ste


Main (10HP, 20HP)

Sub(20HP)

Indoorunit

MAremotecontroller



Outdoor unit

Factorysetting

Main




MA

TB151 2

A B

OC

TB3TB7M1M1M2S

53

IC

MA

TB5-1A1 B1 S

03

TB5-2A2 B2 S

TB151 2

A B

04

OC

TB3TB7M1M2M1M2 S

54

OC

TB3TB7M1M2 M2M1M2S

51

IC

TB5-1A1 B1S

01

L1Use CN41 as is.

PowerSupply

A B S

G-50A

A B S

L32

L33

Option

DC power supply line(DC12V)

L34

m1

L2

L3

m1

Use CN41 as is.

Use CN41 as is.

✻There is one indoor controller board inside indoor unit.

✻There are two indoor controller boards inside indoor unit.

L31

not connect

not connect

1 System with multiple indoor units (10HP, 20HP)

29

7-5.External input/output specifications

(1) Input/output specifications

Function Usage Signals

Function Usage Signal

Input

Start/stop Turning ON/OFF the indoor unit

· Pulse [Factory setting: Dip SW1-9 ON](a-contact with voltage/without voltage) ✻1

<With voltage> Power Source: DC12~24V Electrical Current: Approximately 10mA (DC12V)

<Standard Pulse>

Sending a command to perform dehumidifi-cation with priority

LevelRefer to the wiring diagram <Dehumidification command> shown on the page31.

· Level [Dip SW1-9 OFF]

Output

No.1OperationStatus

Obtaining signals indicating operation status of indoor units in each refrigerant circuit.

Relay a-contact output DC 30V or AC 220~240V

Standard Current : 1AMinimum Current : 1mA

No. 1Error Status

Obtaining signals indicating error status of indoor units in each refrigerant circuit.

No. 2OperationStatus

Obtaining signals indicating operation status of indoor units in each refrigerant circuit.

No. 2Error Status

✻

✻

✻ 20HP only

Obtaining signals indicating error status of indoor units in each refrigerant circuit.

over 200ms(Pulse powering time)

over 200ms(Pulse interval)

✻1 Use minute-current contact (DC12V 1mA)

Dehumidi-fication signal

Short: operateOpen: stop

30

(2) Wiring

External input/output board

Power Source for Display

No.1 Operation Status

No.1 Error Status

✻ No.2 Operation Status

✻ 20HP only

✻ No.2 Error Status

Common

Stop/Start

Input with voltage

Input without voltage

Relay Contact Point Output

Stop/Start

External power source

Connection to terminal board Connection with connectors

(✻1) For instructions on how to install the short-circuit plate, refer to "Caution on using the external input function" shown on the next page. Wiring distance 100 m or less.

SW12

L1

L2

L3

L4

(*1) Short circuit plate

(*1) Short circuit plate

SW11

CN53

1

2

3

4

5

1

2

3

4

5

TB21

TB22

TB23

XA

XB

XC

XE

XD

XE

XD

XC

XB

XA

COM

1

2

BC

B1

B2

AC

A1

A2

3

4

5

CN54

<Input with Applied Voltage>DC12~24VElectrical current input (per contact)Approximately 10mA (DC12V)

SW12Remote start/stop switchEach pressing of the SW (Pulse input) switches between ON and OFF.

Remote start/stop✻ Each pressing of the SW (Pulse input) switches

between ON and OFF.

External powersource

<Input without voltage applied>

Contact: Minimum applicable load DC12V 1mAContact rating DC12V 0.1A and over

SW11

<Relay contact output>DC30V or less 1AAC220-240V 1A

No.1 Operation Status Indicator LampL1

No.1 Error Status Indicator LampL2

Power supplyfor displays

No.2 Operation Status Indicator LampL3

No.2 Error Status Indicator LampL4

Relay(Permissible Electrical Current: 10mA~1A)

XA~XE

● Setting on the Indoor UnitConfirm the following setting when using external input.1 No.1, No.2 Controller board Dip SW 3-8: ON (Factory Setting: ON; External input will not be available when OFF.)2 No.1, No.2 address board Dip SW 1-10: OFF (Factory Setting: OFF; External input will not be available when ON.)3 Normal/Local switch inside the unit controller box is set to “Normal.” (Factory Setting: Normal; External input will not be

available when it is set to “Local.”)

31

● Caution on using the external input function (20HP only)

54321COMB2B1BCA2A1AC

TB23 TB21 TB22

CN53 CN54

External input-output board

Short-circuit plate

External input-output board

54321COMB2B1BCA2A1AC

TB23 TB21 TB22

CN53 CN54

Short-circuit plate

External input

<The case of with-voltage input>

· Connecting the short-circuit plate

<The case of no-voltage input>

External input

When using the external input function on the indoor unit that is connected to a two-refrigerant circuit, connect the short-circuit plate that is supplied with the unit to the appropriate terminals on the external input-output board.Without the short-circuit plate, the unit will not function properly.Don’t connect the short-circuit plate in case of a one-refrigerant circuit.

Caution

1 Brown

SW: Dehumidification command Z : Relay

Contact: Minimum applicable load DC12V 1mAContact rating DC12V 0.1A and over

Relay power supply

Indoor unitcontroller circuit board

Adapter forremote display(PAC-SA88HA) Relay circuit Remote controller board

Z SW

CN52

5 Green

Z

<Dehumidification command>

32

(3) Wiring Method

1 Check the indoor unit setting (Refer to 7-5.(2) Wiring )2 When using the external output function, connect each signal line to External output Terminal (TB22)

on the unit, depending on the usage.3 When using external input function, peal the outer layer of the signal line off, and connect it to external

input terminal (TB21 or TB23) on the unit, depending on the usage.

54

32

1CO

MB2

B1BC

A2A1

AC

TB23TB21

TB22

CN

53C

N54

✻1

✻1

Fix the wire on the high-voltage (AC220-240V) clamp. Pull the wire through the hole for transmission line to outside the unit. ✻3

Fix the wire on the low-voltage (below DC30V) clamp. Pull the wire through the hole for transmission line to outside the unit. ✻2

To CN51 of No.1 board

To CN51 of No.2 board

Wiring inside the unit

Wiring On Site

✻1 For instructions on how to install the short circuit plate on the 20HP indoor unit, refer to "Caution on using theexternal input function" shown on the previous page.

✻2 Do not bundle with high-voltage (AC220-240V) wire, since noise interference from such wire may cause theunit to malfunction.

✻3 Do not bundle with minute-voltage (DC30V or below) wire, since noise interference from such wire may causethe unit to malfunction.

Caution1) Wiring should be covered by insulation tube with supplementary insulation.2) Use relays or switches with IEC or equivalent standard.3) The electric strength between accessible parts and control circuit should have 2750V or more.4) TB21 is a terminal specifically for No-voltage contact point input. Do not apply voltage to TB21, since it

must result in malfunction of indoor unit controller board.5) TB23 is specifically for contact point input with voltage. Check the polarity before connecting to avoid

damage to the unit.6) Keep the wires on the input side and on the output side away from each other when using AC220-

240V as a power source for displays.7) Keep the length of the extension part of external signal line under 100m.8) 20HP is shipped with B1 and B2 terminals of TB21 and A1 and A2 terminals of TB23 short-circuited

respectively. Do not eliminate this feature. If it is eliminated, the units in one of the two refrigerant circuits may not operate.

33

(4) Switch setting

● The suction/discharge temperature control of the indoor unit.

Either suction temperature control or discharge temperature control can be selected .The suction/discharge temperature control can be switched by the switches (SWC) on the controller circuitboard inside the controller of the indoor unit. The discharge temperature control is selected at factory shipment. (SWC is set to “Standard.”) To switch the control, set SWC on two controller circuit boards inside the controller as follows.

To perform suction temperature control: Set SWC to “Option (OP)” To perform discharge temperature control: Set SWC to “Standard”

The setting for the SWC on the two controller circuit boards must be the same (applicable only when con-necting to a two-refrigerant circuit). *Only the suction temperature control is performed in the heating mode regardless of the SWC setting.

(5) Dehumidification priority control

This unit can be operated in the dehumidification priority control by receiving external signals (CN52 onindoor unit). The unit goes into the dehumidification priority control when dehumidification signal is received for 10 con-tinuous minutes during cooling operation. The unit resumes normal operation when the signal goes off orwhen the suction temperature reaches 13˚C or below. When the unit is in this control, the unit is operated at the maximum capacity regardless of the actual set-ting, so the room temperature may reach below the preset temperature. If this is a problem, install a circuit that turns off the dehumidification signal based on the room temperature. The model of units described in this manual does not support the reheat function, so it does not allow boththe temperature and humidity to be controlled simultaneously.

(6) Normal/Local switching switch (SW9)

When selecting the “Local” mode using the Normal/Local switching switch beside the MA remote controlleron indoor unit, the local operation is enabled, and the remote ON/OFF operation (external input or systemcontroller) is disabled.If no external input is available, the local operation is enabled in both “Nomal” and “Local” modes.The occurred error is not reported to the upper system, such as building management system including sys-tem controller. (If an error occurs during inspection, the occurred error is reported only to the units, and theerror history remains on the units.)

34

Only use optional parts recommended by Mitsubishi Electric. These parts should only be installed by a qualified technician. Improper installation may result in water leakage, electric shock, or fire.

WARNING

7-7.Notes on the use of optional accessories

7-6.System Rotation Control

Applicable UnitsIndoor units: PFD-P250, 500VM-EOutdoor unit: PUHY-P250YHM-A(-BS)

CAUTION To enable this control function, the following wiring and settings are required at installation.1) Daisy-chain terminals M1 and M2 on the terminal block for transmission line for

centralized control (TB7) on all applicable outdoor units.Move the power jumper connected to CN41 to CN40 on only one of the outdoor units.To supply power to the outdoor unit from a power supply unit, leave the power jumperconnected to CN41as it is (factory setting).

2) Check that the label on the indoor unit circuit board reads KE90D352, if it does not,replace the circuit board.

3) Set the SW1-9 and SW1-10 on indoor units as follows to enable the external input:(SW1-9: ON; SW1-10: OFF).

4) Assign sequential addresses to the units as shown below (Figure 1).(Only use odd numbers for the 10HP system.)

5) Make the rotation group settings by setting the appropriate switches on the outdoor units.

1. General Descriptions• Each group can consist of a maximum of 5 systems and a minimum of 2 systems.•With the use of this control function, one system in a given group serves as a backup andremains stopped.

•The unit designated as the control unit (System 1 in Figure 1) sends command signals to otherunits in the group to start or stop, and rotates the backup unit every 480 hours.

•Rotation sequence is in the ascending order of address, starting from the lowest address afterthe control unit address.(e.g., System 2→System 3→System 4→System 5→System 1 in Figure 1 below)

•If other units in the group detect an error or if there is a communication failure between thesystems, this control is terminated, and the backup unit goes into operation.

OC51

IC01

MA

Figure 1 Sample 20HP system group

OC52

IC02

OC53

IC03

MA

System 2

Backup unit

OC54

IC04

OC55

IC05

MA

System 3

OC56

IC06

OC57

IC07

MA

System 4

OC58

IC08

OC59

IC09

MA

System 5

OC60

IC10

System 1(Control unit)

TB7

TB3TB5

TB15

TB7

TB3TB5

TB15

35

8. Air Conditioning the Computer Room8-1 Main Features of the Floor-Duct Air Conditioners

8-2 Features of air-conditioner for computer room

Filter

Free-access top floor

Ceiling

Com

pute

r

This system is installed by building a floor over an existing floor and using the space between these two floors as an air-conditioning duct. This system has the following characteristics:

1 The temperature and humidity can efficiently and reliably be controlled, since the air-conditioned air issent directly to the machine.

2 It provides a comfortable environment for the operator, since the air can be conditioned to best suit theneeds of the operator and machines.

3 It is favorable in terms of appearance because the air-conditioning duct is out of sight.

4 The location of the duct is irrelevant when considering adding new machines or rearranging the existingmachines, since the entire floor serves as the air duct.

(1) Unlike plenum ventilation and overhead-duct type conditioners, since the conditioned air is not mixedwith the air in the room, the air that comes out of the unit has to meet the predetermined conditions(constant temperature/constant humidity) at the time the air exits the unit.Close attention must be paid to the auto-controlling system.

(2) Dust in the duct space (between the free-access top floor and the existing floor) must be thoroughlyremoved before installing the unit.

(3) Since the existing floor is cooled by the unit, it may produce dews on the ceiling of the room downbelow.

Air-conditioner for computer room is designed to maintain a constant room temperature and humidity. Forunderfloor air supply systems, providing air that meets predetermined requirements is a must. The com-pressor installed in this unit runs year around. The capacity controlled compressor regulates the outlet airtemperature (or inlet air temperature) depending on the load change. The humidifier (Configure to Order)installed in this unit humidifies a room to a target humidity, and regulates the humidity. With priority dehu-midification control (a dehumidifier must be installed on site), a room is dehumidified to a target humidity.Since the reheat function is not equipped, the room temperature may drop below the predetermined tem-perature due to a load inside the room. Therefore, the absolute humidity drops whereas the relativehumidity may not drop to a target humidity.

Caution

36

8-3 Step-by-Step Plan for the Implementation of the Air-Conditioning

Basic Conditions

Securing Necessary Rooms

Decision to Install the Air-Conditioning System

Selecting the Air-Conditioner Model

Selecting the Controllers

Total System Air-conditioning operation panel (secure individual operation circuit), Auto Controller (temperature and humidity indicator/recorder), management, safety, laws, maintenance, earthquake proof, anti-vibration (floor load, anti-vibration device), noise control, etc.

Calculating the Load

Setting the Conditions for the Room

Temperature/humidity Condition

Purpose Making decisions on the computer system

Accommodates possible future expansion (ensuring the acquisition route)

Operation schedule

Back-up system (in case of breakdowns, power outage, water-supply cut offs etc.)

Air conditioning methods (continuous, floor-duct type etc.)

Computer room, CVCF room, MT Disk Storage room

Supplementary computer room, system surveillance room

Programmer room, operator room

Battery room, transformer room

37

8-4 Conditions for the Installation of Computer-Room Air Conditioners

Computer

Fan

Air conditioner

Air intake

Free-accessfloor

Air discharge

(1) Outdoor Temperature and Humidity

Generally the values set for general air conditioners are used, although the value higher than the maxi-mum outdoor temperature and humidity may be set for devices like computer-room air conditioners thatmust keep the air temperature and humidity under predetermined levels.

(2) Indoor Temperature and Humidity

There is a wide range of conditions set by different computer manufacturers, and the conditions need tobe set in consultation with the manufacturers. The most basic conditions include keeping dew condensa-tion and static electricity from forming. It is also necessary to keep the room free of dust to ensure asmooth operation of the computer.

(3) Matching the Volume of Air Flow

It is possible to use the fan on the computer to cool the room. This controlling method requires a certainvolume of cold air in proportion to the amount of heat produced by the device. The inlet panel is located atthe bottom of the unit, and the exhaust pipe is located either on the ceiling, front and back, or on the side.

(4) Considering a Back-up Air Conditioning System

When the system is not allowed to stop at all, a back-up system is necessary. There are several different options for a back-up as the following:

1 Installing two sets of air conditioning systems necessary for the computer.2 Utilizing regular office air conditioners (for people)3 Using one of the units as a back-up

1 is used infrequently due to high costs involved. 2 involves many technical problems such as the difference between preset conditions for computer rooms and office rooms. In general, 3 is a preferredmethod. If 3 is chosen, the unit method (package method) is more economical than the central method.

38

8-5 Setting the Air conditioners

20.9kW

5

20W/m2

60Hz

Computer-generated heat

Number of workers

Lighting

Temperature and humidity

Frequency

Indoor ˚CDB/Indoor WBT : 24˚C/17˚C˚CDB of the air going into the computer : 18˚C

(1) Air-Conditioning Load

(2) Sample Selection of Air Conditioners

(2-1) Conditions

Windows

Inside Measurement

Surroundings

(W: 4.5m, H: 1.5m) ✕ 2

Ceiling height 2.2m

Upstairs room, downstairs room, heat and air conditioning

(2-2) Building Conditions

1 Coefficient of Overall Heat Transmission U (W/m2 ·K)

Summer 3.6, Winter 3.8

2.05

Summer 5.93, Winter 6.5

Floor (free access)

Outer Walls

Inner Walls

Ceiling

Floor

Windows

Downward convection 3.36, upward convection 3.3



2 Internal Load

1 Once the floor plan is made and the conditions for the air-conditioning system are set, air conditioningcapacity has to be determined by calculating the load.

2 Unlike the outdoor air, computer load remains constant throughout the year. However, it is possiblethat there are considerable fluctuations within a day. This is due to the fact that, depending on the timeof the day, there are changes in the number of computers that are turned on and that the differentcomputer systems are in operation.

3 If there is a plan to expand the current computer system in the future, it is important to include theload for the units to be added in the future when calculating the thermal load because it is practicallyimpossible to keep the computers off for days on end during the installation of the new units.

4 The following items need to be checked before calculating the unit capacity:· Floor area of the computer room (m2)· Total quantity of heat generated by computers

Number of People in the Room 5 Lighting 20W/m2

Calculator 20.9kWDraft 0.2 times/h

3 Volume of Outdoor Air Intake

25m3/h·person

Window

39

(2-3) Calculating the Load and Selecting a Model

1 Load (in the summer with air-conditioning)

2 Necessary Air Circulation

3 Model Selection

< Sensible Heat > SH

< Latent Heat > LH

Total load is 28.8kW

Computer

Lighting

Number of people in the room

Infiltration draft

Outer wall (heat transmission)

Windows (radiation)

Windows (heat transmission)

Inner wall(heat transmission)

Outside air

1,800W

5 persons ✕ 64 (U)

(0.2 times/h) 39.6m3 ✕ 0.336 ✕ 8

8.5m2 ✕ 3.6 ✕ 8

13.5m2 ✕ 0.65 ✕ 188

13.5 ✕ 5.93 ✕ 8

61.6 ✕ 2.05 ✕ 4

125m3 ✕ 0.336 ✕ 8

20.9 kW

1.8 kW

0.32 kW

0.11 kW

0.25 kW

1.91 kW

0.64 kW

0.5 kW

0.34 kW

26.8 kWTotal

Infiltration draft

Number of people in the room

Outside air

39.6 ✕ 834 ✕ 0.0117

5 persons ✕ 82

125m3 ✕ 834 ✕ 0.0117

0.39 kW

0.41 kW

1.22 kW

2.0 kWTotal

26800

0.336 ✕ (24 -18)V = ÷ 60 = 221m3/min

Calculate the temperature difference by setting the outdoor temperature; then, calculate hourly loads.The chart shows the result of a calculation, supposing that the system reaches its highest load at 12 o'clock.Outdoor temperatures in this example Summer : 32˚CDB relative humidity 60%

Winter : -2˚CDB relative humidity 42%

PUHY-P250YHM-A ✕ 2, PFD-P500VM-E typeIndoor ˚CDB 24˚C / Indoor ˚CWB 17˚C outdoor ˚CDB 32˚CCapacity of the Moment 54.3kW SHF = 0.92Capacity of Sensible Heat 54.3 ✕ 0.92 = 49.9/kWStandard Air-Flow Volume: 320m3/min can be accommodated with PUHY-P250YHM-A ✕ 2 and PFD-P500VM-E.

40

8-6 Automatic Control of the Computer Room

✻1✻2

< Outdoor Unit >

Free-Access Floor

< Indoor unit >

Suctiontemperaturesensor

Discharge temperature sensor

RA

SA

TB3 TB3

Controller

Terminal Bed forExternal Input/Output

Remote Controller

ExamplePFD-P500VM-E automatically controls the cooling temperature with a built-in controller. (suction temperature or discharge temperature control)This unit is designed for high sensible-heat specifications, and it does not include a humidifier or a dehumidi-fier. Install such components as necessary.

✻1 Bold lines in the diagram indicate refrigerant piping (gas/liquid).This system consists of two refrigerant circuit.

✻2 Indicates TB3-type transmission line used to communicate with the indoor unit.This system is made up of two circuit.

41

9. Maintenance/Inspection9-1. Maintenance/Inspection Schedule

Indo

orO

utdo

or

Fan Motor 6 months 40000 hours Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

YesYes

Bearing 6 months 40000 hours

Fan Belt 6 months 8000 hours

Air Filter 3 months 5 years Yes

Drain Pan 6 months 8 years

Add lubricant once a year

Disposable parts

Maintenance schedule changes depending on the local conditions

Drain Hose 6 months 8 years

Linear Expansion Valve 1 year 25000 hours

Heat Exchanger 1 year 5 years

Float Switch 6 months 25000 hours

Display Lamp (LED) 1year 25000 hours

Compressor 6 months 40000 hours

Fan motor 6 months 40000 hours

Linear Expansion Valve1 year 25000 hours

Heat Exchanger 1 year 5 years

Pressure Switch 1 year 25000 hours

PartsCheck every

Replace after

Daily check

Periodically check Remarks

Yes

4-way valve

1 year 25000 hours

Unit

Having the units inspected by a specialist on a regular basis, in addition to regular maintenance such aschanging the filters, will allow the users to use them safely and in good condition for an extended period oftime.The chart below indicates standard maintenance schedule.

(1) Approximate Long evity of Various Parts

The chart shows an approximate longevity of parts. It is an estimation of the time when old parts mayneed to be replaced or repairs need to be made.It does not mean that the parts must absolutely be replaced (except for the fan belt).Please note that the figures in the chart do not mean warranty periods.

(2) Notes

The above chart shows a maintenance schedule for a unit that is used under the following conditions:A. Less than 6 times per hour of compressor stoppageB. The unit stays on 24 hours a day.

Shortening the inspection cycle may need to be considered when the following conditions apply:When used in high temperature/high humidity area or when used in a place where the temperatureand/or humidity fluctuate greatlyWhen plugged into an unstable power source (sudden change in voltage, frequency, wave distor-tions) (Do not exceed the maximum capacity.)When the unit is installed in a place where it receives vibrations or major impacts.When used in a place with poor air quality (containing dust particles, salt, poisonous gas such assulfuric acid gas and sulfuric hydrogen gas, oil mist).

Even when the above maintenance schedule is followed, there could be unexpected problems thatcannot be predicted.

Holding of PartsWe will hold parts for the units for at least 9 years after the termination of the production of the unit,following the standards set by the ministry of economics and industries.

1

2

3

4

42

(3) Details of Maintenance/Inspection

. Check for unusual noise

. Measure the insulation resistance

. Check for excessive slack . Check for wear and tear . Check for unusual noise


. Free of unusual noise

. Insulation resistance over 1M

. Resistance (30~40N/belt) . Adequate amount of slack=5mm. Belt length=no longer than 102% of the original length

. Free of wear and tear



Replace when insulation resistance is under 1M

. Check for clogging of the drainage system

. Check for loosened bolts

. Check for corrosion

. Check for clogging of the drainage system

. Chec

. Check the drainage of the drain trap

k for corrosion

. Clean, free of clogging

. Free of loose screws

. No major disintegration

Clean if dirty or cloggedTighten boltsReplace if extremely worn

. Perform an operation check using the operation data

. Adequately controls the air temperature

Replace if malfunctioning

. Check for torn wire, fraying, and unplugged connectors

. Check insulation resistance

. No frayed or cut wires or unplugged connectors


Replace when cut or shorted, when the insulation resistance goes below 1M , or if there is a history of abnormal operation


. Adequately controls the air temperature


. Check for clogging, dirt, and damage

. Clean, free of clogging or damage

Clean


. Measure insulation resistance

. Free of unusual sound

. Insulation resistance over 1MReplace if insulation resistance goes below 1M

. Make sure the lamp comes on . Comes on when the output is . Rapid drop in brightness

on Replace if the light does not come on when the power is on


. Adequately controls the refrigerant temperature when the valve is switched (Check temperature change when cooling/heating is switched.)


. Check for clogging and tear

. Clean the filter

. Clean, free of damage Clean the filterReplace if extremely dirty or damaged

. Check the outer appearance

. Make sure its free of foreign objects

. Free of frayed or cut wires

. Free of foreign objectsReplace if damaged or extremely wornRemove foreign objects

. Clean, free of clogging

. Free of wear and tearClean if dirty or cloggedReplace if ePour water into the drain trap

xtremely worm


. Check insulation resistance

. Check for loosened terminals

. Free of unusual sound


. Free of loosened terminals

Replace if insulation resistance goes below 1M (under the condition that the refrigerant is not liquefied)Tighten loosened bolts

Adjust the beltReplace if the belt length exceeds 2% of the original length, worn, or used over 8000 hours

If the noise doesn't stop after lubrication, change the oil. Add lubricant once a year.

. Check for clogging, dirt, and damage

. Clean, free of clogging or damage

Clean

Parts

Fan motor

Bearing

Fan belt

Air filter

Linear expansion valve

Display lamp

Compressor

Fan motor

Linear expansion valve

6 months

6 months

6 months

6 months

3 months

Check pointsInspection

CycleUnit What to doAssessment

Drain pan

Drain hose

Float switch

Heat exchanger

Pressure switch

4-way valve

Indo

orO

utdo

or

1 year

1 year

1 year

Heat exchanger

(LED)

DATA BOOK PUHY-P250YHM-APFD-P250VM-EPFD-P500VM-E

Issued in June 2008 MEE07K622Printed in Japan

New publication effective June 2008.Specifications subject to change without notice.

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Documents

AIR CONDITIONERS - Kühlen, Heizen und Lüften / …...8-2 Features of air-conditioner for computer room 8-3 Step-by-Step Plan for the Implementation of the Air-Conditioning 8-4 Conditions