Service Manual PEFY-P-NMHU-E-OA

ii

HWE1804A GB

Safety PrecautionsRead before installation and performing electrical work

Symbol explanations

Ask your dealer or a qualified technician to install the unit.- Improper installation by the user may result in water leakage, electric shock, or fire.Properly install the unit on a surface that can withstand its weight.- Unit installed on an unstable surface may fall and cause injury.Only use specified cables. Securely connect each cable so that the ter-minals do not carry the weight of the cable.- Improperly connected cables may produce heat and start a fire.Take appropriate safety measures against wind gusts and earthquakes to prevent the unit from toppling over.- Improper installation may cause the unit to topple over and cause injury or damage to the unit.Only use accessories (i.e., air cleaners, humidifiers, electric heaters) recommended by Mitsubishi Electric.Do not make any modifications or alterations to the unit.Consult your dealer for repair.- Improper repair may result in water leakage, electric shock, or fire.Do not touch the heat exchanger fins with bare hands.- The fins are sharp and pose a risk of cuts.In the event of a refrigerant leak, thoroughly ventilate the room.- If gaseous refrigerant leaks out and comes in contact with an open flame, toxic gases will be generated.Properly install the unit according to the instructions in the Installation Manual.- Improper installation may result in water leakage, electric shock, or fire.Have all electrical work performed by an authorized electrician accord-ing to the local regulations and the instructions in this manual. Use a dedicated circuit.- Insufficient power supply capacity or improper installation of the unit may re-sult in malfunctions of the unit, electric shock, or fire.Disconnect all electric power supplies before accessing of electric parts (inner of control box, fan motor, drain pump etc.)- Touching electric parts result in electric shock.Keep electrical parts away from water.- Wet electrical parts pose a risk of electric shock, smoke, or fire.

Securely attach the control box cover.- If the cover is not installed properly, dust or water may infiltrate and pose a risk of electric shock, smoke, or fire.Only use the type of refrigerant that is indicated on the unit when install-ing or relocating the unit.- Infiltration of any other types of refrigerant or air into the unit may adversely affect the refrigerant cycle and may cause the pipes to burst or explode.When installing the unit in a small space, take appropriate precautions to prevent leaked refrigerant from reaching the limiting concentration.- Leaked refrigerant gas will displace oxygen and may cause oxygen starva-tion. Consult your dealer before installing the unit.Consult your dealer or a qualified technician when moving or reinstall-ing the unit.- Improper installation may result in water leakage, electric shock, or fire.After completing the service work, check for a refrigerant leak.- If leaked refrigerant is exposed to a heat source, such as a fan heater, stove, or electric grill, toxic gases will be generated.Do not try to defeat the safety features of the unit.- Forced operation of the pressure switch or the temperature switch by defeat-ing the safety features for these devices, or the use of accessories other than the ones that are recommended by Mitsubishi Electric may result in smoke, fire, or explosion.Consult your dealer for proper disposal method.Do not use a leak detection additive.

Precautions for handling units for use with R410A

Do not use the existing refrigerant piping.- A large amount of chlorine that may be contained in the residual refrigerant and refrigerator oil in the existing piping may cause the refrigerator oil in the new unit to deteriorate.Use refrigerant piping materials made of phosphorus deoxidized cop-per. Keep the inner and outer surfaces of the pipes clean and free of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and moisture.- Contaminants in the refrigerant piping may cause the refrigerator oil to de-teriorate.Store the piping materials indoors, and keep both ends of the pipes sealed until immediately before brazing. (Keep elbows and other joints wrapped in plastic.)- Infiltration of dust, dirt, or water into the refrigerant system may cause the refrigerator oil to deteriorate or cause the compressor to malfunction.Use a small amount of ester oil, ether oil, or alkyl benzene to coat flares and flanges.- Infiltration of a large amount of mineral oil may cause the refrigerator oil to deteriorate.Charge the system with refrigerant in the liquid phase.- If gaseous refrigerant is drawn out of the cylinder first, the composition of the remaining refrigerant in the cylinder will change and become unsuitable for use.Only use R410A.- The use of other types of refrigerant that contain chloride may cause the re-frigerator oil to deteriorate.Use a vacuum pump with a check valve.- If a vacuum pump that is not equipped with a check valve is used, the vac-uum pump oil may flow into the refrigerant cycle and cause the refrigerator oil to deteriorate.Prepare tools for exclusive use with R410A. Do not use the following tools if they have been used with the conventional refrigerant: gauge manifold, charging hose, gas leak detector, check valve, refrigerant charge base, vacuum gauge, and refrigerant recovery equipment.- If the refrigerant or the refrigerator oil that may be left on these tools are mixed in with R410A, it may cause the refrigerator oil in the new system to deteriorate. Infiltration of water may cause the refrigerator oil to deteriorate.Leak detectors for conventional refrigerants will not detect an R410A leak because R410A is free of chlorine.

Thoroughly read the following safety precautions prior to installation.Observe these safety precautions for your safety.This equipment may have adverse effects on the equipment on the same power supply system.Contact the local power authority before connecting to the system.

WARNINGThis symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or death.

CAUTIONThis symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or damage to the unit.

Indicates an action that must be avoided.

Indicates important instructions.

Indicates a parts that requires grounding.

Indicates that caution must be taken with rotating parts. (This symbol is on the main unit label.) <Color: Yellow>

Indicates that the parts that are marked with this symbol pose a risk of electric shock. (This symbol is on the main unit label.) <Color: Yellow>

WARNINGCarefully read the labels affixed to the main unit.

WARNING

CAUTION

iiHWE1804A GB

Do not use a charging cylinder.- If a charging cylinder is used, the composition of the refrigerant in the cylin-der will change and become unsuitable for use.Exercise special care when handling tools for use with R410A.- Infiltration of dust, dirt, or water into the refrigerant system may cause the refrigerator oil to deteriorate.

CONTENTS

HWE1804A GB

I Features[1] Features.................................................................................................................................... 1

II Part Names and Functions[1] Part Names and Functions ....................................................................................................... 2

1.Indoor (main) unit.................................................................................................................... 22.Remote controller ................................................................................................................... 3

III Specification[1] Specification ............................................................................................................................. 5

1.Specification ........................................................................................................................... 52.Electrical parts specifications.................................................................................................. 6

IV Outlines and Dimensions[1] Outlines and Dimensions.......................................................................................................... 7

V Wiring Diagram[1] Wiring Diagram ....................................................................................................................... 11

VI Refrigerant System Diagram[1] Refrigerant System Diagram .................................................................................................. 13

VII Troubleshooting[1] Troubleshooting ...................................................................................................................... 14

1.Check methods..................................................................................................................... 142.DC fan motor (fan motor/indoor control board)..................................................................... 183.Setting of address switch...................................................................................................... 194.Voltage test points on the control board ............................................................................... 205.Setting of dip-switch (at delivery).......................................................................................... 216.Function setting .................................................................................................................... 217.Selecting external static pressure......................................................................................... 228.Enabling the function to prevent cold draft (during heating operation) ................................. 229.Setting addresses ................................................................................................................. 2310.Function the LED of the indoor unit service board.............................................................. 23

VIII Disassembly Procedure[1] Disassembly Procedure (PEFY-P36, 48NMHU-E-OA)........................................................... 24

1.Control box ........................................................................................................................... 242.Fan and fan motor ................................................................................................................ 253.LEV, thermistor (Liquid/Gas piping temperature detection).................................................. 264.Drain pump ........................................................................................................................... 275.Heat exchanger .................................................................................................................... 286.Control box inside layout ...................................................................................................... 307.Thermistor position ............................................................................................................... 31

[2] Disassembly Procedure (PEFY-P72, 96NMHU-E-OA)........................................................... 321.Control box ........................................................................................................................... 322.Fan and fan motor ................................................................................................................ 333.LEV, thermistor (Liquid/Gas piping temperature detection).................................................. 354.Drain pump ........................................................................................................................... 365.Heat exchanger .................................................................................................................... 386.Control box inside layout ...................................................................................................... 407.Thermistor position ............................................................................................................... 41

HWE1804A GB

[ I Features ]

- 1 -HWE1804A GB

I Features

[1] Features

Model Cooling capacity/Heating capacity

kW

PEFY-P36NMHU-E-OA 10.5/6.2




Ceiling ConcealedSeries PEFY

Indoor unit

[ II Part Names and Functions ]

- 2 -HWE1804A GB

II Part Names and Functions

[1] Part Names and Functions

1. Indoor (main) unit

Air inlet

Air outlet


- 3 -HWE1804A GB

2. Remote controller[PAR-30MAOA]Once the operation mode is selected, the unit will remain in the selected mode until changed.

(1) Remote Controller Buttons

Function buttons

9 107 8

5

6

1234

Main display:

Fri

Set temp.

Mode Temp. Fan

Cool

Main

Cursor Page

Main menuVane·Louver·Vent. (Lossnay)High powerTimerWeekly timerOU silent mode

ON/OFF buttonPress to turn ON/OFF the indoor unit.

SELECT buttonPress to save the setting.

RETURN buttonPress to return to the previous screen.

MENU buttonPress to bring up the Main menu.

Backlit LCDOperation settings will appear. When the backlight is off, pressing any button turns the backlight on andit will stay lit for a certain period of time depending on the screen.

ON/OFF lampThis lamp lights up in green while the unit is in operation. It blinks while theremote controller is starting up or when there is an error.

The functions of the function buttons change depending on the screen.Refer to the button function guide that appears at the bottom of the LCD forthe functions they serve on a given screen. When the system is centrally controlled, the button function guide thatcorresponds to the locked button will not appear.

Main display Main menu

Function button F1Main display: Press to change the operation mode.Main menu: Press to move the cursor down.

Function button F2Main display: Press to decrease temperature.Main menu: Press to move the cursor up.

Function button F3Main display: Press to increase temperature.Main menu: Press to go to the previous page.

Function button F4Main display: Press to change the fan speed.Main menu: Press to go to the next page.

Function guide

5

6

9

10

7

8

1

2

3

4

9 107 8 9 107 8

• When the backlight is off, pressing any button turns the backlight on and doesnot perform its function. (except for the ON/OFF button)

• Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the Menu screen.

- 4 -


GBHWE1804A

(2) Remote Controller Display

Fri

Mode Temp. Fan

Cool Set temp.

Fri

Cool

Mode Temp. Fan

Set temp.910

11

12 13 14 15 16 17 18

19

20

21

21

1

1

2

2

3 3

44

5

5

67

8

The main display can be displayed in two different modes: "Full" and "Basic."The factory setting is "Full." To switch to the "Basic" mode, change the setting on the "Main display" setting screen (Main menu > Initial setting > Main display).

Operation mode

Preset temperature

Clock

Fan speed

Button function guideFunctions of the corresponding buttons appear here.

Appears when the ON/OFF operation is centrally controlled.

Appears when the operation mode is centrally controlled.

Appears when the preset temperature is centrally controlled.

Appears when the filter reset function is centrally controlled.

TemperatureCurrent outlet air temperature appears here.

Appears when the buttons are locked.

Appears when the On/Off timer, Night setback, or Auto-off timer function isenabled.

appears when the timer is disabled by the centralized control system.

Appears when the Weekly timer is enabled.

Appears while the units are operated in the energy-save mode.

Appears while the outdoor units are operated in the silent mode.

Appears when the thermistor on the indoor unit is activated to monitor theoutlet air temperature ( ).* This icon appears when the remote controller is connected to the Fresh

Air Intake model. If the icon does not appear, refer to the indoor unitInstruction Book.

appears when the built-in thermistor on the remote controller isactivated to monitor the room temperature.

Indicates the vane setting.This function cannot be used on the Fresh Air Intake model units.

Indicates the louver setting.This function cannot be used on the Fresh Air Intake model units.

Indicates the ventilation setting.This function cannot be used on the Fresh Air Intake model units.

Appears when the preset temperature range is restricted.

9

10

11

12

13

14

15

16

17

11

18

19

20

21

Appears when an energy-saving operation is performed using a "3D i-Seesensor" function.

22

1

2

3

4

5

6

7

8

Indicates when filter needs maintenance.

* All icons are displayed for explanation.

Full mode Basic mode

[ III Specification ]

- 5 -HWE1804A GB

III Specification

[1] Specification

1. Specification

Model PEFY-P36NMHU-E-OA PEFY-P48NMHU-E-OA PEFY-P72NMHU-E-OA PEFY-P96NMHU-E-OA

Power source 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz 1-phase 208/230 V 60 Hz

Cooling capacity *1 BTU/h 36,000 48,000 72,000 96,000

*1 kW 10.5 14.1 21.1 28.1

*2 Power input kW 0.130 0.180 0.220 0.320

(208 V) *2 Current input A 1.25 1.59 1.86 2.56

Temp. range of 17.2°CD.B. ~ 47.7°CD.B.

cooling 63°FD.B. ~ 118°FD.B.

Thermo-off (FAN-mode) automatically starts if the outdoor temperature is lower than 63°F (17.2°C)D.B.

The fan speed automatically runs at a very low speed if the outdoor temperature is higher than 109°F (42.8°C)D.B.

Heating capacity *3 BTU/h 21,000 28,000 43,000 57,000

*3 kW 6.2 8.2 12.6 16.7

*2 Power input kW 0.140 0.200 0.240 0.330

(208 V) *2 Current input A 1.09 1.46 1.70 2.42

Temp. range of -10°CD.B. ~ 15°CD.B.

heating 14°FD.B. ~ 59°FD.B.

Thermo-off (FAN-mode) automatically starts if the outdoor temperature is higher than 59°F (15.0°C)D.B.

External finish Galvanized Galvanized Galvanized Galvanized

External dimension H x W x D inch 15 x 47-1/16 x 35-7/16 15 x 47-1/16 x 35-7/16 18-9/16 x 49-1/4 x 44-1/8 18-9/16 x 49-1/4 x 44-1/8

mm 380 x 1,195 x 900 380 x 1,195 x 900 470 x 1,250 x 1,120 470 x 1,250 x 1,120

Net weight lbs (kg) 109 (49) 109 (49) 177 (80) 183 (83)

Heat exchanger Cross fin (Aluminium fin and copper tube)

Cross fin (Aluminium fin and copper tube)



FAN Type x Quantity Sirocco fan x 1 Sirocco fan x 1 Sirocco fan x 2 Sirocco fan x 2

External in.WG <0.60> - 0.80 - <1.00> <0.60> - 0.80 - <1.00> <0.60> - 0.80 - <1.00> <0.60> - 0.80 - <1.00>

*4, 5 static press. Pa <150> - 200 - <250> <150> - 200 - <250> <150> - 200 - <250> <150> - 200 - <250>

Motor Type DC motor DC motor DC motor DC motor

Motor output kW 0.244 0.244 0.375 0.375

Driving mechanism Direct-driven by motor Direct-driven by motor Direct-driven by motor Direct-driven by motor

*5 Air flow rate (Low-Mid-High) (Low-Mid-High) (Low-Mid-High) (Low-Mid-High)

cfm 350 - 400 - 450 500 - 550 - 600 700 - 800 - 900 1,000 - 1,100 - 1,200

m3/min 9.9 - 11.3 - 12.7 14.2 - 15.6 - 17.0 19.8 - 22.7 - 25.5 28.3 - 31.1 - 34.0

L/s 165 - 188 - 212 237 - 260 - 283 330 - 378 - 425 472 - 518 - 567

*6 Air flow rate cfm 320 420 700 790

(Very low) m3/min 9.1 11.9 19.8 22.4

L/s 152 198 330 373

Sound pressure level (measured in anechoic room) (Low-Mid-High) (Low-Mid-High) (Low-Mid-High) (Low-Mid-High)

dB <A> 35-38-40 38-40-41 34-38-42 39-41-44

Air filter Field supply Field supply Field supply Field supply

Diameter of Liquid (R410A) inch (mm) 3/8 (9.52)Brazed 3/8 (9.52)Brazed 3/8 (9.52)Brazed 3/8 (9.52)Brazed

refrigerant pipe Gas (R410A) inch (mm) 5/8 (15.88)Brazed 5/8 (15.88)Brazed 3/4 (19.05)Brazed 7/8 (22.22)Brazed

Field drain pipe size inch (mm) O.D.1-1/4 (32) x2 O.D.1-1/4 (32) x2 O.D.1-1/4 (32) x2 O.D.1-1/4 (32) x2

Remarks Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to the Installation Manual.Systems with considerably long pipe runs, in heating mode, may be subject to slightly louder than normal noise from the outdoor unit/s.

Notes: Unit converter

1.Cooling capacity indicates the maximum value at operation under the following condition. Cooling: Indoor 91°F (32.7°C)DB/82°F (27.8°C)WB, Outdoor 91°F (32.7°C)DB. The set temperature of the remote controller is 63°F (17.2°C). 2.The values are measured at the factory setting of external static pressure. 3.Heating capacity indicates the maximum value at operation under the following condition. Heating: Indoor 32°F (0°C)DB/27°F (-2.9°C)WB, Outdoor 32°F (0°C)DB/27°F (-2.9°C)WB. The set temperature of the remote controller is 77°F (25°C). 4.The factory setting of external static pressure is shown without < >. Refer to "Fan characteristics curves", according to the external static pressure, in DATA BOOK for the usable range of air flow rate. 5.If the airflow rate is over the usable range, dew drop can be caused from the air outlet and the air flow rate is changed automatically because of the output down by the fan motor control. If the air flow rate is less than the usable range, condensation from the unit surface can be caused. 6.The very low mode is not selectable from the remote controller. The unit will automatically operate in the very low mode when the outside temperature exceeds 109°F (42.8°C) in the Cooling mode or drops below 14°F (-10°C) in the Heating mode. The combination of fresh air intake type indoor units with other types of indoor units that handle internal thermal load may cause the conflict of operation mode. It is not recommended when fresh air intake type indoor unit is connected to the Y or WY series. Depending on the air conditioning load, outside temperature, and due to the activation of protection functions, the desired preset temperature may not always be achieved and the discharge temperature may swing. Note that untreated outside air may be delivered directly into the room upon the activation of protection functions. Fresh air intake type indoor units cannot be connected to PUMY and cannot be connected to an outdoor unit together with PWFY series. The maximum connectable indoor units to 1 outdoor unit are 110% (100% in case of heating below 23°F (-5°C)). When fresh air intake type indoor units connect to an outdoor unit together with other types of indoor unit, the total capacity of fresh air intake type indoor units needs to be 30% or less of the connected outdoor unit capacity. The AUTO mode on the local remote controller is available only when fresh air intake type indoor unit is connected to the R2 or WR2 series of outdoor unit. The system changeover function is available only when all the connected indoor units are fresh air intake type indoor units. The fan temporary stops during defrost. The cooling and heating capacities are the maximum capacities that were obtained by operating in the above air conditions and with a refrigerant pipe of about 25 ft (7.5 m) and a level difference of 0 m. The actual capacity characteristics vary with the combination of indoor and outdoor units. See the technical information in DATA BOOK for the details. Thermo off (Fan) operation automatically starts either when temperature is lower than 63°F (17.2°C)DB in cooling mode or when the temperature exceeds 59°F (15.0°C)DB in heating mode. Dry mode is not available. Un-conditioned outdoor air such as humid air or cold air blows to the indoor during thermo off operation. Please be careful when positioning indoor unit air outlet grilles, ie take the necessary precautions for cold air, and also insulate rooms for dew condensation prevention as required. Air filter must be installed in the air intake side. The filter should be attached where easy maintenance is possible in case of usage of field supply filters. Before switching ducts by using a damper, be sure to bring the indoor unit to a stop to prevent malfunction. Make sure to set the static pressure in all ducts within the range specified in the P-Q line diagram in the DATA BOOK. This indoor unit does not interlock with an electric heater. Regarding P96NMHU-E-OA, the low notch air flow rate is different from the spec value when the external static pressure setting is set to 150Pa. See Fan characterics curves in DATA BOOK for the details.

kcal =kW x 860

BTU/h =kW x 3,412

cfm =m3/min x 35.31

lbs =kg/0.4536

*Above specification data is subject to rounding variation.

[ III Specification ]

- 6 -HWE1804A GB

2. Electrical parts specifications

modelSymbol PEFY-P36, 48NMHU-E-OA PEFY-P72NMHU-E-OA PEFY-P96NMHU-E-OA

Parts name

Outlet air temperaturethermistor

TH21 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ

Liquid pipe thermistor TH22 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ

Gas pipe thermistor TH23 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ

Inlet air temperature thermistor TH24 Resistance 0°C/15kΩ, 10°C/9.6kΩ, 20°C/6.3kΩ, 25°C/5.4kΩ, 30°C/4.3kΩ, 40°C/3.0kΩ

Fuse FUSE 250 VAC 6.3A

Fan motor(with inner thermostat) MF1, 2 8-pole, output 244W

SIC-101CW-D8244-410-pole, output 375W

KMUC4E2MW or KMUC4E3MW

Linear expansion valve LEV 12 VDC Stepping motor drive

Power supply terminal bed TB2 (L, N, ) 250V 20A

Transmission terminal bed

TB5TB15

(M1, M2, S) 250V 20A(1, 2) 250V 15A

[ IV Outlines and Dimensions ]

- 7 -HWE1804A GB

IV Outlines and Dimensions

[1] Outlines and Dimensions

1. PEFY-P36, 48NMHU-E-OAUnit: mm (in.)

2×5-

ø3(1

/8) h

oles

15(5

/8)

50

50(2)

50×18=900(2×18=35-7/16)

23(15/16)1204(47-7/16)(Suspension bolt pitch)1250(49-1/4)

814(

32-1

/16)

904(

35-5

/8)

900(

35-7

/16)

847(

33-3

/8)

10(7

/16)

41

1000(39-3/8)(Duct)

94(3

-3/4

)25

0(9-

7/8)

2×19

-ø3(

1/8)

hol

es

143

25(1)50×4=200

45(1-13/16)50×5=250

380(15)

25

50(2)

40(1-5/8)

65(2-9/16)1130(44-1/2)

50×20=1000(2×20=39-3/8)

10(7

/16)

(Duc

t)

Sus

pens

ion

bolt

hole

(Sus

pens

ion

bolt

pitc

h)

80(3-3/16)

4-14

×30(

9/16

×1-3

/16)

Slo

t2×

21-ø

3(1/

8) h

oles

Term

inal

blo

ck(P

ower

sou

rce)

Con

trol b

ox1

Ref

riger

ant p

ipin

g (g

as)

2×6-

ø3(1

/8) h

oles

2 R

efrig

eran

t pip

ing

(liqu

id)

115(4-9/16)(T

rans

mis

sion

)

29

60(2

-3/8

)

24(1

)29

(1-3

/16)

15(5

/8)

50(2)

187

69

164.

5

58

50

16(1

1/16

)34

0(13

-7/1

6)

1050(41-3/8)(Duct)

(Duc

t)

180

326.5(12-7/8)

432(

17-1

/16)

Dra

in p

ipe

(1)

Air

inle

tA

ir ou

tlet

(2) braz

ing

conn

ectio

n

braz

ing

conn

ectio

n (In

tegra

l lift p

ump o

utlet)

(2×5=9-7/8)

Term

inal

blo

ckD

rain

pip

e(E

mer

genc

y dr

ain)

Dra

in p

ipe

(Gra

vity

dra

in)

(7-3

/8)

34

(2-3

/4) (6

-1/2

)(7

-1/8

)

(1-3/16)

(1-3/8)

(MA

rem

ocon

)Te

rmin

al b

lock

(1-5/8)

(5-11/16)(2-5/16)

(2)

(2×4=7-7/8)

700(27-9/16) Max

300(

11-1

3/16

) or l

ess

3 D

rain

hos

e

(Act

ual l

engt

h)65

0 -10(2

-9/1

6

)0 -7

/16

Inle

t air

Top

Out

let a

ir

Top

Botto

m

side

vie

wsi

de v

iew

view

Pip

ing

side

vie

w

Not

e 1.

Use

an

M10

scr

ew fo

r the

sus

pens

ion

bolt

(fiel

d su

pply

).2.

Mak

e su

re to

inst

all t

he a

ir fil

ter (

field

sup

ply)

on

the

air

inta

ke s

ide.

In c

ase

field

sup

plie

d ai

r filt

er is

use

d, a

ttach

itw

here

the

filte

r ser

vice

is e

asily

don

e.

Mode

lPE

FY-P3

6NMH

U-E-OA

ø15.

88(5

/8)

ø9.5

2(3

/8)

Drain

hos

e32

mm

(1-1

/4inc

h)<a

cces

sory

>PE

FY-P4

8NMH

U-E-OA

Gas p

ipe1

Liquid

pipe

2Dr

ain ho

se3


- 8 -HWE1804A GB

Unit: mm (in.),S

ecur

e en

ough

acc

ess

spac

e to

allo

w fo

r the

mai

nten

ance

,insp

ectio

n,an

d re

plac

emen

t of t

he m

otor

,fan,

heat

exc

hang

er,

drai

n pa

n an

d co

ntro

l box

in o

ne o

f the

follo

win

g w

ays.

Sel

ect a

n in

stal

latio

n si

te fo

r the

indo

or u

nit s

o th

at it

's m

aint

enan

ce a

cces

s sp

ace

will

not

be

obst

ruct

ed b

ybe

am o

r oth

er o

bjec

ts.

Cre

ate

acce

ss d

oor 1

(450

×450

mm

)(17

-3/4

×17-

3/4i

nch)

for t

he m

aint

enan

ce fr

om th

e un

it si

de w

hen

the

ther

mis

tor,L

EV

and

cont

rol b

ox is

exc

hang

ed.(F

ig.2

,4)

(1) W

hen

a sp

ace

of 3

00m

m(1

1-13

/16i

nch)

or m

ore

is a

vaila

ble

belo

w th

e un

it be

twee

n th

e un

it an

d th

e ce

iling

.C

reat

e ac

cess

doo

r 2(6

00×6

00m

m)(

23-5

/8×2

3-5/

8inc

h) fo

r the

mai

nten

ance

from

the

botto

m w

hen

the

mot

or,fa

n,he

at e

xcha

nger

and

dra

in p

an is

clea

ned(

exch

ange

d).(F

ig.2

)(2

) Whe

n a

spac

e of

less

than

300

mm

(11-

13/1

6inc

h) is

ava

ilabl

e be

low

the

unit

betw

een

the

unit

and

the

ceili

ng.

(At l

east

20m

m(1

3/16

inch

) of s

pace

sho

uld

be le

ft be

low

the

unit

as s

how

n in

Fig

.3.)

Cre

ate

acce

ss d

oor 3

for t

he m

aint

enan

ce fr

om th

e bo

ttom

whe

n th

e m

otor

,fan,

heat

exc

hang

er a

nd d

rain

pan

iscl

eane

d(ex

chan

ged)

.(Fig

.4)

Sup

ply

air

Inta

ke a

ir

Con

trol b

ox

Acc

ess

door

1C

eilin

gC

eilin

g be

am

Min. 20mm

Min. 20mm

Con

trol b

ox

Acc

ess

door

3

Acc

ess

door

1(4

50×4

50)(

17-3

/4×1

7-3/

4)

5090

0

450

100~

200

1000

1230

501130(44-1/2)

150~200

450

Bot

tom

of

indo

or u

nit

(Vie

wed

from

the

dire

ctio

n of

the

arro

w Y

)

Mai

nten

ance

acce

ss s

pace

Fig.

4

Supp

lyai

rIn

take

air

Y

Fig.

3

Sup

ply

air

Inta

ke a

ir

Con

trol b

ox

Acc

ess

door

1C

eilin

gCe

iling

beam

Min. 20mm

Min. 300mm

Con

trol b

oxA

cces

s do

or 2

(600

×600

)

Acc

ess

door

1(4

50×4

50)(

17-3

/4×1

7-3/

4)45

010

0~20

0

1130(44-1/2)

150~200

450

Botto

m o

f ind

oor u

nit

(Vie

wed

from

the

dire

ctio

n of

the

arro

w Z

)M

aint

enan

ceac

cess

spa

ceFi

g.2

Supp

lyai

rIn

take

air

Z

Fig.

1

600

600

900

150~

200

200~250

50

(13/16)

(11-13/16) (13/16)

(13/16)

(3-1

5/16

~7-7

/8)

(17-

3/4)

(23-

5/8×

23-5

/8)

(5-1

5/16

~7-7

/8)

(23-

5/8)

(35-

7/16

)

(5-15/16~7-7/8)

(23-5/8) (7-7/8~9-7/8)

(2)

(2)

(35-

7/16

)

(17-

3/4)

(3-1

5/16

~7-7

/8)

(17-3/4) (17-3/4) (5-15/16~7-7/8)

(48-7/16)

(2)

(39-

3/8)

[Mai

nten

ance

acc

ess

spac

e]


- 9 -HWE1804A GB

2. PEFY-P72, 96NMHU-E-OAUnit: mm (in.),

Air in

letAi

r outl

et

(Pow

er s

ourc

e)

(MA

rem

ocon

)

(ø22

(7/8

) Tra

nsm

issi

on w

iring

)

(ø22

(7/8

) Pow

er s

ouse

wiri

ng)

(Tra

nsm

issi

on)

1100(43-5/16)(Duct) 100

1372(54-1/16)1326(52-1/4)(Suspension bolt pitch) 23(15/16)

100×10=1000(3-15/16×10=39-3/8) 50(2)

100(3-15/16)

340(

13-7

/16)

105(

4-3/

16)

15

2×11

-ø3(

1/8)

hol

es2×

11-ø

3(1/

8) h

oles

100×10=1000(3-15/16×10=39-3/8)100(3-15/16)

50(2)1250(49-1/4)

10

60(2

-3/8

)11

24(4

4-5/

16)

1034

(40-

3/4)

(Sus

pens

ion

bolt

pitc

h)

100(3-15/16)60(2-3/8)100×3=300

9515

(5/8

)

29(1

-3/1

6)10

67(4

2-1/

16)

24(1

)10

(7/1

6)

1120

(44-

1/8) 48

9(19

-5/1

6)

Kno

ckou

t hol

e

Kno

ckou

t hol

e

Term

inal

blo

ck

Dra

in p

ipe30(1-3/16)

1 R

efrig

eran

t pip

ing(

gas)

2 R

efrig

eran

t pip

ing(

liqui

d)D

rain

pip

e

Con

trol b

ox2×

4-ø3

(1/8

) hol

esTe

rmin

al b

lock

Term

inal

blo

ck

2×4-

ø3(1

/8) h

oles

470(18-9/16)

100×3=300 20(13/16)100(3-15/16)

327(12-7/8)

164(6-1/2)44

41(1-5/8)

1021100(43-5/16)(Duct)

20(1

3/16

)42

0(16

-9/1

6)

249(

9-13

/16)

342(

13-1

/2)

80

(Gra

vity

dra

in)

(Duc

t)

(4-1/16)

(Duc

t)

(3-15/16)

100(3-15/16)

(7/1

6)(5

/8)

Sus

pens

ion

bolt

hole

4-14

×30(

9/16

×1-3

/16)

Slo

t

(3-3

/4)

(Inte

gral

lift

pum

p ou

tlet)

(3-15/16×3=11-13/16)

(3-3

/16)

Dra

in p

ipe

(Em

erge

ncy

drai

n)

(1-3/4)

(3-15/16×3=11-13/16)braz

ing

conn

ectio

n

braz

ing

conn

ectio

n

700(27-9/16) Max

300(

11-1

3/16

) or l

ess

3 D

rain

hos

e

(Act

ual l

engt

h)65

0 -10(

2-9/

16

)

0 -7/1

6

Inle

t air

Top

Out

let a

ir

Top

Botto

m

side

vie

wsi

de v

iew

view

Pip

ing

side

vie

w

Note

1.U

se a

n M

10 s

crew

for t

he s

uspe

nsio

n bo

lt (fi

eld

supp

ly).

2.M

ake

sure

to in

stal

l the

air

filter

(fie

ld s

uppl

y) o

n th

e ai

rin

take

sid

e.In

cas

e fie

ld s

uppl

ied

air f

ilter i

s us

ed, a

ttach

itwh

ere

the

filter

ser

vice

is ea

sily

done

.

Mod

el1

Gas p

ipe2

Liquid

pipe

3Dr

ain ho

sePE

FY-P7

2NMH

U-E-OA

ø19.

05(3

/4)

ø9.5

2(3

/8)

Drain

hos

e32

mm

(1-1

/4inc

h)<a

cces

sory

>PE

FY-P9

6NMH

U-E-OA

ø22.

2(7/

8)


- 10 -HWE1804A GB

Unit: mm (in.),S

ecur

e en

ough

acc

ess

spac

e to

allo

w fo

r the

mai

nten

ance

,insp

ectio

n,an

d re

plac

emen

t of t

he m

otor

,fan,

heat

exc

hang

er,

drai

n pa

n an

d co

ntro

l box

in o

ne o

f the

follo

win

g w

ays.

Sel

ect a

n in

stal

latio

n si

te fo

r the

indo

or u

nit s

o th

at it

's m

aint

enan

ce a

cces

s sp

ace

will

not

be

obst

ruct

ed b

ybe

am o

r oth

er o

bjec

ts.

Cre

ate

acce

ss d

oor 1

(450

×450

mm

)(17

-3/4

×17-

3/4i

nch)

for t

he m

aint

enan

ce fr

om th

e un

it si

de w

hen

the

ther

mis

tor,L

EV

and

cont

rol b

ox is

exc

hang

ed.(F

ig.2

,4)

(1) W

hen

a sp

ace

of 5

00m

m(1

9-11

/16i

nch)

or m

ore

is a

vaila

ble

belo

w th

e un

it be

twee

n th

e un

it an

d th

e ce

iling

.C

reat

e ac

cess

doo

r 2(6

00×6

00m

m)(

23-5

/8×2

3-5/

8inc

h) fo

r the

mai

nten

ance

from

the

botto

m w

hen

the

mot

or,fa

n,he

at e

xcha

nger

and

dra

in p

an is

clea

ned(

exch

ange

d).(F

ig.2

)(2

) Whe

n a

spac

e of

less

than

500

mm

(19-

11/1

6inc

h) is

ava

ilabl

e be

low

the

unit

betw

een

the

unit

and

the

ceili

ng.

(At l

east

20m

m(1

3/16

inch

) of s

pace

sho

uld

be le

ft be

low

the

unit

as s

how

n in

Fig

.3.)

Cre

ate

acce

ss d

oor 3

for t

he m

aint

enan

ce fr

om th

e bo

ttom

whe

n th

e m

otor

,fan,

heat

exc

hang

er a

nd d

rain

pan

iscl

eane

d(ex

chan

ged)

.(Fig

.4)

Con

trol b

ox

Acce

ss d

oor 1

Cei

ling

Cei

ling

beam

Min. 20mm

Min. 20mm

1250(49-1/4)450

1120

5050

450

200~

300

Supp

lyai

r

1220

1350

50

Acc

ess

door

1(4

50×4

50)(

17-3

/4×1

7-3/

4)

150~200

Acc

ess

door

3

Con

trol b

ox

Bot

tom

of

indo

or u

nit

Inta

keai

r

Mai

nten

ance

acce

ss s

pace Fig.

4(V

iew

ed fr

om th

e di

rect

ion

of th

e ar

row

Y)

Supp

ly a

irIn

take

air

Y

Fig.

3

Botto

m o

f ind

oor u

nit

450

200~

300

1250(49-1/4)

150~200

450

Supp

lyai

r

Con

trol b

ox

Acc

ess

door

2(6

00×6

00)

Acc

ess

door

1(4

50×4

50)(

17-3

/4×1

7-3/

4)

Mai

nten

ance

acce

ss s

pace

Inta

keai

r

Fig.

2(V

iew

ed fr

om th

e di

rect

ion

of th

e ar

row

Z)

Sup

ply

air

Inta

ke a

ir

Con

trol b

ox

Acc

ess

door

1C

eilin

gC

eilin

g be

am

Min. 20mm

Min. 500mm

Z

Fig.

160

011

2025

0~30

0

600 200~300

(17-

3/4)

(7-7

/8~1

1-13

/16)

(13/16)

(19-11/16)

(17-3/4) (5-15/16~7-7/8)(2

3-5/

8)

(44-

1/8)

(9-7

/8~1

1-13

/16)

(23-

5/8~

23-5

/8)

(23-5/8) (7-7/8~11-13/16)

(2)

(2)

(44-

1/8)

(17-

3/4)

(7-7

/8~1

1-13

/16)

(5-15/16~7-7/8)(17-3/4) (2)

(53-3/16)

(48-

1/16

)

(13/16)

(13/16)

[Mai

nten

ance

acc

ess

spac

e]

[ V Wiring Diagram ]

- 11 -HWE1804A GB

V Wiring Diagram

[1] Wiring Diagram

1. PEFY-P36, 48NMHU-E-OA

ON

CN

D(R

ed)

INSIDE

SECT

ION O

F CON

TROL

BOX

SW

E

TB2

13C

NP

LED

1

PO

WE

R S

UP

PLY

~208

,230

V60

Hz

53

11

CN

2M(B

lue)

2

1C

N3A

(Blu

e)

3

5678

90 1 2

3

4

SW12

(10t

hs d

igit)

SW

1

SW

2

SW

3

SW

4

SW

21

SW

22

2 CN

20(R

ed)1

2

CN

44

14

3

1CN60

23456

LEV

S(SH

EILD

)

TH21

TH22

TH23

TO N

EXT I

NDOO

R UN

ITBR

EAKE

R(16

A)FU

SE(16

A)

PU

LL B

OX

TO M

A RE

MOT

ECO

NTRO

LLER

TO O

UTDO

OR U

NIT

BC C

ONTR

OLLE

RRE

MOT

E CO

NTRO

LLER

CN

AC

L(B

lack

)

SA

UZN

R00

2

CN

41

CN

51

CN

52(G

reen

)

CN

32

CN

105

(Red

)

09

87 6 5

4

321

SW11

(1s

digi

t)

0

876

54321

SW14

(BR

ANC

H N

o.)

FE

DC B A 9

21

21

3C

NE

(Whi

te)

3

2 CN

22(G

reen

)

1

TH24

LED

2

CN

90

2

CN

4F

14

3FS

L1L2

GTB

5M1

M2TB

151

2

CN

27(R

ed)

7 CNMF

1

41

MF

31

65

7

CNDB

53

1

1

2 34

DB

I.B.

OFF

MS 3~

M

MS 3~ DP

AC

L

UZN

R00

1F1

PAR

TS L

OC

ATIO

N

AC

LS

YM

BO

LS

YM

BO

L E

XP

LAN

ATIO

N NA

ME

NOTE

)1.S

ince

the

outd

oor s

ide

elec

tric

wirin

g m

ay c

hang

e be

sur

eto

che

ck th

e ou

tdoo

r uni

t ele

ctric

wiri

ng fo

r ser

vicin

g.2.

Sym

bols

used

in w

iring

dia

gram

are

:Con

nect

or,

:T

erm

inal

,(H

eavy

dot

ted

line)

:Fie

ld w

iring

,3.

Have

all e

lect

ric w

ork

done

by

a lic

ense

d el

ectri

cian

acco

rdin

g to

the

loca

l reg

ulat

ions

.4.

Earth

leak

age

circu

it br

eake

r sho

uld

be s

et u

p on

the

wirin

gof

the

powe

r sup

ply.

5.To

per

form

a d

rain

age

test

for t

he d

rain

pum

p tu

rn o

n th

e SW

Eon

the

cont

rol b

oard

whi

le th

e in

door

uni

t is

bein

g po

were

d.*B

e su

re to

turn

off

the

SWE

afte

r com

plet

ing

a dr

aina

ge te

st o

r tes

t run

.6.

Use

copp

er s

uppl

y wi

res.

AC re

actor

(Pow

er fa

ctor im

prov

emen

t)Di

ode B

ridge

Drain

Pum

pFlo

at sw

itch

Fan M

otor

Powe

r sou

rce te

rmina

l bloc

kTr

ansm

ission

term

inal b

lock

Tran

smiss

ion te

rmina

l bloc

kTh

ermi

stor (

outle

t air t

emp.

detec

tion)

Ther

misto

r (pip

ing te

mp.de

tectio

n/liqu

id)Th

ermi

stor (

piping

temp

.detec

tion/g

as)

DB

DP

FS MF

TB2

TB5

TB15

TH21

TH22

TH23

CN32

Conn

ecto

r (Re

mot

e sw

itch)

CN41

Conn

ecto

r (HA

term

inal

-A)

CN51

Conn

ecto

r (Ce

ntra

lly c

ontro

l)CN

52Co

nnec

tor (

Rem

ote

indi

catio

n)CN

90Co

nnec

tor (

Wire

less

)CN

105

Conn

ecto

r (IT

term

inal

)

SW

2Sw

itch

(for c

apac

ity co

de)

SW

3Sw

itch

(for m

ode

selec

tion)

SW

14Sw

itch

(BRA

NCH

No.)

SW

21Sw

itch

(for s

tatic

pre

ssur

e se

lectio

n)S

W22

Switc

h (W

ireles

s pair

No.

)S

WE

Conn

ecto

r (em

erge

ncy o

pera

tion)

LED

1LE

D(Po

wer s

upply

)LE

D2

LED(

Rem

ote

cont

rolle

r sup

ply)

SY

MB

OL

NA

ME

SY

MB

OL

NA

ME

SAAr

rest

erF1

Fuse

AC2

50V

6.3A

ZNR00

1,002

Varis

tor

SW

4Sw

itch

(for m

odel

selec

tion)

SW

11Sw

itch

(1s d

igit a

ddre

ss se

t)S

W12

Switc

h (1

0ths

digi

t add

ress

set)

I.B.

Indo

or c

ontro

ller b

oard

I.B.

Indo

or co

ntro

ller b

oard

Elec

trical

linea

r exp

ansio

n valv

eLE

V

Ther

misto

r (inl

et air

temp

. dete

ction

)TH

24

CN27

Conn

ecto

r (Da

mpe

r out

put)

SW1

Switc

h (fo

r mod

e se

lect

ion)

I.B.

TB2

CO

NTR

OL

BO

XTB

5

DB

AC

L

TB15

t°t°

t°t°

-+

[ V Wiring Diagram ]

- 12 -HWE1804A GB

2. PEFY-P72, 96NMHU-E-OA

The

grou

ndin

g w

ire o

f the

mot

or w

ire is

foun

d on

ly o

n th

e K

MU

C4E

3MW

. The

mod

el o

f the

mot

or is

not

ed in

th

e na

mep

late

on

the

fan

mot

or c

asin

g.t°

t°t°

t°

-+

ONOF

F

7

CN

D(R

ed)

I.B.

CNM

F1

INSIDE

SECT

ION O

F CON

TROL

BOX

SW

E

13C

NP

LED

1

PO

WE

R S

UP

PLY

~208

,230

V60

Hz

53

1

46

51

1C

N2M

(Blu

e)2

1CN

3A(B

lue)

3

5678

90 1 2

3

4

SW12

(10t

hs d

igit)

SW

1

SW

2

SW

3

SW

4

SW

21

SW

22

2 CN

20(R

ed)1

1CN60

2346

DP

LEV

1TH

21

TO N

EXT I

NDOO

R UN

ITBR

EAKE

R(16A

)FU

SE(16

A)TO

MA

REM

OTE

CONT

ROLL

ERTO

OUT

DOOR

UNI

TBC

CON

TROL

LER

REM

OTE

CONT

ROLL

ER

MF

31

CN

AC

L(B

lack

)

LED

2

SA

UZN

R00

2

CN41

CN51

CN52

(Gre

en)

CN

32

CN

105

(Red

)

09

87 6 5

4

321

SW11

(1s

digi

t)

0

876

54321

SW14

(BR

ANC

H N

o.)

FE

DC B A 9

21

21

3C

NE

(Whi

te)

3

2 CN

22(G

reen

)

1

TH24

1

CN6V 2346

LEV

2

CN

90

2

CN

4F

14

3FS

TB2

S(SH

EILD

)L1

L2G

TB5

M1M2

TB15

12

CN

27(R

ed)2

CN

44

14

3

TH22

TH23

7

CNDB

53

1

1

2 34

AC

L

DB

MS 3~

MS 3~

MM

UZN

R00

1F1

PU

LL B

OX

PART

S LO

CATI

ON

NOTE

)1.S

ince

the

outd

oor s

ide

elec

tric

wirin

g m

ay c

hang

e be

sur

eto

che

ck th

e ou

tdoo

r uni

t ele

ctric

wiri

ng fo

r ser

vicin

g.2.

Sym

bols

used

in w

iring

dia

gram

are

Conn

ecto

r,

:Te

rmin

al,

(Hea

vy d

otte

d lin

e):F

ield

wiri

ng,

3.Ha

ve a

ll ele

ctric

wor

k do

ne b

y a

licen

sed

elec

tricia

nac

cord

ing

to th

e lo

cal r

egul

atio

ns.

4.Ea

rth le

akag

e cir

cuit

brea

ker s

houl

d be

set

up

on th

e wi

ring

of th

e po

wer s

uppl

y.5.

To p

erfo

rm a

dra

inag

e te

st fo

r the

dra

in p

ump

turn

on

the

SWE

on th

e co

ntro

l boa

rd w

hile

the

indo

or u

nit i

s be

ing

powe

red.

*Be

sure

to tu

rn o

ff th

e SW

E af

ter c

ompl

etin

g a

drai

nage

test

or t

est r

un.

6.Us

e co

pper

sup

ply

wire

s.

AC

LS

YM

BO

LS

YM

BO

L E

XP

LAN

ATIO

N NA

ME

AC re

actor

(Pow

er fa

ctor im

prov

emen

t)Di

ode B

ridge

Drain

Pum

pFlo

at sw

itch

Fan M

otor

Powe

r sou

rce te

rmina

l bloc

kTr

ansm

ission

term

inal b

lock

Tran

smiss

ion te

rmina

l bloc

kTh

ermi

stor (

outle

t air t

emp.

detec

tion)

Ther

misto

r (pip

ing te

mp.de

tectio

n/liqu

id)Th

ermi

stor (

piping

temp

.detec

tion/g

as)

DB

DP

FS MF

TB2

TB5

TB15

TH21

TH22

TH23

CN32

Con

nect

or (R

emot

e sw

itch)

CN41

Con

nect

or (H

A te

rmin

al-A

)CN

51C

onne

ctor

(Cen

trally

con

trol)

CN52

Con

nect

or (R

emot

e in

dica

tion)

CN90

Con

nect

or (W

irele

ss)

CN10

5C

onne

ctor

(IT

term

inal

)

SW

2Sw

itch

(for c

apac

ity co

de)

SW

3Sw

itch

(for m

ode

selec

tion)

SW

14Sw

itch

(BRA

NCH

No.)

SW

21Sw

itch

(for s

tatic

pre

ssur

e se

lectio

n)S

W22

Switc

h (W

ireles

s pair

No.

)S

WE

Conn

ecto

r (em

erge

ncy o

pera

tion)

LED

1LE

D(Po

wer s

upply

)LE

D2

LED(

Rem

ote

cont

rolle

r sup

ply)

SY

MB

OL

NA

ME

SY

MB

OL

NA

ME

SAA

rres

ter

F1Fu

se A

C25

0V 6

.3A

ZNR0

01,002

Varis

tor

SW

4Sw

itch

(for m

odel

selec

tion)

SW

11Sw

itch

(1s d

igit a

ddre

ss se

t)S

W12

Switc

h (1

0ths

digi

t add

ress

set)

I.B.

Indo

or c

ontro

ller b

oard

I.B.

Indo

or co

ntro

ller b

oard

Elec

trical

linea

r exp

ansio

n valv

e

Ther

misto

r (inl

et air

temp

. dete

ction

)TH

24

LEV1

,LEV

2CN

27C

onne

ctor

(Dam

per o

utpu

t)

SW1

Sw

itch

(for m

ode

sele

ctio

n)

I.B.

TB2

CONT

ROL

BOX

TB5

DB ACL

TB15

[ VI Refrigerant System Diagram ]

- 13 -HWE1804A GB

VI Refrigerant System Diagram

[1] Refrigerant System Diagram

Capacity PEFY-P36, 48NMHU-E-OA PEFY-P72NMHU-E-OA PEFY-P96NMHU-E-OA

Gas pipe ø15.88 [5/8] ø19.05 [3/4] ø22.2 [7/8]

Liquid pipe ø9.52 [3/8] ø9.52 [3/8] ø9.52 [3/8]

Strainer (#100mesh)

Strainer (#100mesh)

Heat exchanger

Inlet air temperature thermistor TH24

Outlet air temperature thermistor TH21

Gas pipe thermistor TH23

Liquid pipe thermistor TH22

Linear expansion valve

Gas pipe

Brazed joints

[ VII Troubleshooting ]

- 14 -HWE1804A GB

VII Troubleshooting

[1] Troubleshooting

1. Check methods1. Component and check points(1) Thermistor

Inlet air temperature thermistor (TH21)Liquid pipe thermistor (TH22)Gas pipe thermistor (TH23)Outdoor air temperature thermistor (TH24)Disconnect the connector and measure the resistance between terminals with a tester.(Ambient temperature 10°C - 30°C)

1) Thermistor characteristic graph

(2) Fan motor (CNMF)

Refer to the page on "DC fan motor (fan motor/indoor control board)."

(3) Linear expansion valve

Disconnect the connector, and measure the resistance between terminals with a tester.Refer to the next page for details.

Normal Abnormal

4.3kΩ - 9.6kΩ Open or short

(Refer to the thermistor characteristic graph below.)

Thermistor R0 = 15 kΩ 3%Multiplier of B = 3480 kΩ 2%

0°C 15kΩ10°C 9.6kΩ20°C 6.3kΩ25°C 5.2kΩ30°C 4.3kΩ40°C 3.0kΩ

Normal Abnormal

1-6 2-6 3-6 4-6 Open or shortWhite-Red Yellow-Red Orange-Red Blue-Red

(150Ω) 10%

(A) Red (E) Yellow

(C) Blue (F) White

(D) Orange

Rt = 15 exp 3480( ) 1

273+t1

273

0

10

20

30

40

50

-20 -10 0 10 20 30 40 50

Temperature(°C)

Res

ista

nce(

kΩ)

1 2 3 4

6 LEV

M

(A)

(C)

(D)

(E)

(F) CN60


- 15 -HWE1804A GB

1) Summary of linear expansion valve (LEV) operation

The LEV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board.The LEV position changes in response to the pulse signal.

Indoor control board and LEV connection

Pulse signal output and valve operation

The output pulse changes in the following order:When the valve closes 1 -> 2 -> 3 -> 4 -> 1When the valve opens 4 -> 3 -> 2 -> 1 -> 4When the valve position remains the same, all output signals will be OFF.If any output signal is missing or if the signal remains ON, the motor vibrates and makes clicking noise.

(A) Red (G) Control board

(C) Blue (H) Connection (CN60)

(D) Orange (I) Drive circuit

(E) Yellow (J) Linear expansion valve

(F) White

Phase number

Output pulse

1 2 3 4

ø1 ON OFF OFF ON

ø2 ON ON OFF OFF

ø3 OFF ON ON OFF

ø4 OFF OFF ON ON

4

3

6

5

2

1

(G)

(H)

(I)

(J) (A)

(A)

(B)

(C)

(C)

(D)

(D) (E)

(E)

(F) (F)

12VDC

M

4

6

2

3

5 1


- 16 -HWE1804A GB

2) LEV operation

When the power is turned on, a pulse signal of fully open pulse + 10% pulse is output (valve closure signal), to bring the valve to position A.When the valve is operating normally, it is free of vibration noise. If the valve locks or when it goes from point E to A in the figure, it makes louder noise than would be heard when there is an open phase. Check for abnormal sound/vibration by placing the metal tip of a screwdriver against the valve and the handle side against your ear.

3) Troubleshooting

(a) Close

(b) Open

(c) Fully open valve (2000 pulses)

(d) No. of pulses

(e) Extra tightening (41 pulses)

(f) Valve opening degree(f)

(a)

(b)

(e)

(d)

(c)

Symptom Checking Criteria Remedy

Circuit failure on the microcomputer

Disconnect the connectors on the control board, and connect LEDs to test the cir-cuit as shown below.

Pulse signals are output for 10 seconds when the main power is turned on. If there are LEDs that do not light up at all or remain lit after the pulses are turned off, there is a problem with the driving circuit.

Replace the in-door control board if driving circuit failure is detected.

Locked LEV The motor will idle and make small clicking noise if it is run while the LEV is locked. If this clicking noise is heard both when the valve is fully closed and while it is being opened, it indicates a problem.

Replace the LEV.

Disconnected or shorted LEV motor coils

Measure the resistance between the coils with a tester (red-white, red-orange, Red-yellow, Red-blue). The normal range of resistance is 150 10%

Replace the LEV.

6

5

4

3

2

11 k LED


- 17 -HWE1804A GB

(4) Drain pump

(5) Drain float switch (CN4F)

Disconnect the connector, and measure the resistance between terminals with a tester.

Valve closure fail-ure (leaky valve)

To check the LEV on the indoor unit, check the indoor unit liquid pipe temperature that appears on the operation monitor on the outdoor unit's multi control board while operating the indoor unit in question in the FAN mode and the other indoor units in the cooling mode.

Replace the LEV if the amount of leakage is great.

(A) Termistor (TH22)

Normally, the LEV is fully closed while the unit is in the FAN mode. If the valve is leaky, liquid pipe thermistor reading will be lower than normal. If it is significantly lower than the inlet temperature on the remote controller, valve closure failure is suspected. If the amount of leakage is insignificant, replacement of LEV is unnec-essary unless it is causing a problem.

Misconnections of connectors or con-tact failure

Perform a visual check for disconnected connectors.Perform a visual check of lead wire color.

Disconnect the connectors on the control board and perform a continuity test.

(A)

LEV

1. Check if the drain float switch works properly.2. Check if the drain pump works and drains water properly in cooling operation.3. If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the

operation starts.Note: The drain pump for this model is driven by the internal DC motor of controller board, so it is not

possible to measure the resistance between the terminals.

NormalRed–Black: Input 13V DC The fan starts to rotate.Purple–Black: Abnormal (check code 2502) if it outputs 0–13 V square wave (5 pulses/rotation), and

the number of rotaion is not normal.

(A) Moving part

(B) Switch

(C) Magnet

Position of the moving part Normal Abnormal

Up Short (any position but short)

Down Open (any position but open)

RedPurpleBlack

123

1234

(A)

(A)

(B)(C)


- 18 -HWE1804A GB

2. DC fan motor (fan motor/indoor control board)1. CAUTION A high voltage is applied to the connector for connection to the fan motor (CNMF1).Do not unplug the connector CNMF1 with the unit energized to avoid damage to the indoor control board and fan motor.Electric shock hazard. Do not touch the motor when energized.

2. TroubleshootingSymptom: Indoor unit fan does not run.

Check fan motor connector contact (CNMF1).

Fix the connection.

Yes

NoIs the fan motor connector (CNMF1) fully inserted?

Replace the indoor control board.

Yes

NoIs the voltage within the normal range?

Check the power supply.Measure the voltage at the indoor control board.

15VDC (same with the voltage between fan connector 5 (+) and 4(-)) 1 - 6.5VDC (same with the voltage between fan connector 6 (+) and 4(-))

[Values for Vsp are the values that are measured with the fan motor in operation. Vsp is 0V when the fan motor is stopped.]

Power supply voltage310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))

VDC

Check the fan motor position thermistor signal.Get the motor to make a full rotation or more, and measure the voltage at the test point VFG.(same with the voltage between fan connector 7 (+) and 4(-))

Replace the indoor control board.

Yes

No Replace the motor.Are 0VDC and 15VDC displayed alternately?


- 19 -HWE1804A GB

3. Setting of address switchMake sure that power source is turning off.

1) Incase using network remote controller, address is set by rotary switches. (SW11,SW12)

It is not necessary setting address in case of using unit remote controller.

2) Indoor unit address setting rule is different by each field work.Refer to install manual of outdoor unit, operate the address setting.

3) Setting the address is combination of SW11 (1st digit address setting) and SW12 (2nd digit address setting).

Address " 3 " setting is composed SW11 " 3 " and SW12 " 0 ".Address " 25 " setting is composed SW11 " 5 " and SW12 " 2 ".

SW

22012345678

9A

B C D EF 0

12345

6 7 8 9

01234

56 7 8 9

Indoor unit control board

SW

2S

W1

SW

4S

W3

SW

21S

W12

SW

14S

W11

Indoor unit do not run without address setting in field.


- 20 -HWE1804A GB

4. Voltage test points on the control board

CND Power supply voltage (208 - 230VAC)

CN2M For M-NET transmission cable connection (24 - 30VDC)

CN3A For MA remote controller cable connection (10 - 13 VDC (Between 1 and 3.))

CNP Drain-up mechanism output (13VDC)

CNMF1 Fan motor output1 - 4: 294 - 340 VDC5 - 4: 15 VDC6 - 4: 0 - 6.5 VDC7 - 4: Stop 0 or 15 VDC

Run 7.5 VDC(0 - 15 pulse)

VFG Voltage on 3 of PC352 and the (-) side of C351(Same with the voltage between 7 (+) and 4 (-) of CNMF)

VCC Voltage between the C084 pins 15 VDC(Same with the voltage between 5 (+) and 4 (-) of CNMF)

Vsp Voltage between the C351 pins0VDC (with the fan stopped)1 - 6.5VDC (with the fan in opera-tion)(Same with the voltage between 6 (+) and 4 (-) of CNMF)

CN2M

CND

CN3A

CNMF1

CNP


- 21 -HWE1804A GB

5. Setting of dip-switch (at delivery)

6. Function setting(1) SW1

(2) SW3

Models SW1 SW2 SW3 SW4 SW21 SW22 SWE

PEFY-P36NMHU-E-OA

PEFY-P48NMHU-E-OA

PEFY-P72NMHU-E-OA

PEFY-P96NMHU-E-OA

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4

ON

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4

ON

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4

ON

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8 9 10

ON

1 2 3 4 5 6

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4

ON

ON

1 2 3 4 5 6 7 8 9 10

The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.

Switch position Function Switch setting

ON OFF

1 Active Thermistor - Indoor unit

2 Filter clogging detection Available Unavailable

3 Filter life 2500 hr 100 hr

4 - - -

5 Remote display Thermo-ON signal Fan output

6 - - -

7 - - -

8 - - -

9 Auto restart after power failure Enabled Disabled

10 Power start/stop Enabled Disabled

Switch position Function Switch setting

ON OFF

1 Unit type Cooling only Heat pump

2 - - -

3 - - -

4 - - -

5 - - -

6 - - -

7 - - -

8 - - -

9 - - -

10 Thermo-OFF temperature for cooling

63°F(17.2°C)

57.2°F(14°C)


- 22 -HWE1804A GB

7. Selecting external static pressureThis indoor unit supports three external static pressure settings.

Notes: When the static pressure setting were set from the remote controller, the actual setting and the switch setting on the control board may not match because the latest setting from the remote controller overrides the previous setting. To check the latest static pressure setting, check them on the remote controller, not on the switch.If the static pressure setting for the duct is lower than that for the unit, the fan of the unit may repeat start/stop, and the outdoor unit may remain in a stopped state. Match the static pressure settings for the unit to that for the duct.

To set the static pressure setting with the switches on the control board

To set the static pressure setting from the function selection screen on the remote controller (Some remote control-lers do not support the function selection function. Refer to the Instruction Book of a given remote controller.)

Follow the instructions below and the instructions detailed in the remote controller manual for how to set the switches.1. Set the function setting No. 32 (Switch setting/Function selection) to “2”.2. Set the function setting No. 8 to appropriate values, according to the airflow mode and the static pressure setting.

8. Enabling the function to prevent cold draft (during heating operation)This indoor unit features a function that automatically changes the fan speed to Very Low when the outside temperature reach-es at or below the preset temperature to reduce the undesired effect of cold outside air to the supply air. This function can be enabled or disabled and the trigger threshold temperature can also be selected by setting the function No. 117 to the desired setting. Refer to the table below for details.

External static pressure SW21-1 SW21-2 Set the switches on the control board (SW21-1, and SW21-2) as shown in the table at left.

0.6 in.WG (150 Pa) OFF ON

0.8 in.WG (200 Pa) OFF OFF

1.0 in.WG (250 Pa) ON OFF

Selection

Function setting No. Initial

SettingCurrent setting

No. 32

Switch setting 1

Function selection 2

External staticpressure setting

Function setting No. Initial setting

Current setting

[Important]Be sure to write down the settings for all func-tions in the “Current setting” row if any of the initial settings has been changed.

No. 8

0.6 in.WG (150 Pa) 1

0.8 in.WG (200 Pa) 2

1.0 in.WG (250 Pa) 3

Function setting No.Setting Initial

settingCurrent setting

[Important]Be sure to write down the settings for all func-tions in the “Current setting” row if any of the initial settings has been changed.

No. 117

1 Disabled

2 Triggered at outside temperature of 23°F (-5°C) or below

3 Triggered at outside temperature of 21.2°F (-6°C) or below




7 Triggered at outside temperature of 14°F (-10°C) or below

15 Initialize the setting


- 23 -HWE1804A GB

9. Setting addresses(Be sure to operate with the main power turned OFF.)There are two types of rotary switch setting available: setting addresses 1 to 9 and over 10, and setting branch numbers.

1) How to set addressesExample: If Address is “3”, remain SW12 (for over 10) at “0”, and match SW11 (for 1 to 9) with “3”.

2) How to set branch numbers SW14 (Series R2 only)The branch number assigned to each indoor unit is the port number of the BC controller to which the indoor unit is con-nected.Leave it to “0” on the non-R2 series of units.

The rotary switches are all set to “0” when shipped from the factory. These switches can be used to set unit addresses and branch numbers at will.The determination of indoor unit addresses varies with the system at site. Set them referring to the Data Book.

10.Function the LED of the indoor unit service board

Factory setting

Factory setting

Symbol Silk display LED operation under normal state

LED1 Main power source At applying main power source (indoor unit 200V) → Lighting

LED2 Transmission power source At receiving M-NET transmission power source → Lighting

[ VIII Disassembly Procedure ]

- 24 -HWE1804A GB

VIII Disassembly Procedure

[1] Disassembly Procedure (PEFY-P36, 48NMHU-E-OA)

1. Control boxBe careful on removing heavy parts.

1. Removing the control box cover(1) Remove the fixing screws (two) of the control box (A), and

remove the cover. (Fig.1)

*At this stage, the following servicing is possible. (Fig.2)

1) Operation and check of the switches (listed below) which are on the control board.Dip switch SW1 . . . . . . . . . . . . Function changeDip switch SW2 . . . . . . . . . . . . Capacity code settingDip switch SW3 . . . . . . . . . . . . Function changeDip switch SW4 . . . . . . . . . . . . Model code settingDip switch SW21 . . . . . . . . . . . Static pressure settingDip switch SW22 . . . . . . . . . . . Function settingRotary switches SW11, 12 . . . . Address settingRotary switch SW14 . . . . . . . . . Branch port setting

2) Connection check of the lead wires (listed below) which are connected to the controller board.Power supply lead wire.Transmission lead wire x 2Fan motor lead wire.LEV lead wireInlet air temperature thermistor lead wireOutlet air temperature thermistorLiquid piping temperature thermistor lead wireGas piping temperature thermistor lead wireDrain pump lead wireFloat switch lead wire

3) Control board exchange4) Reactor exchange5) Thermistor (inlet air, outlet air, liquid piping, gas piping)

exchange6) Power supply terminal bed exchange7) Transmission terminal bed exchange x 2

Fig.1

Fig.2

Fixing screws(A)


- 25 -HWE1804A GB

2. Fan and fan motorBe careful on removing heavy parts.Electric shock hazard. Before performing any work, shut off the power supply.

1. Remove the control box cover according to the procedure in section [1]-1. Control box.

2. Removing the fan motor cable(1) Disconnect the connector (CNMF1) from the control

board.

(2) Remove the cable through the rubber bush.

3. Removing the bottom plate (Fig.1)(1) Remove the fifteen fixing screws on the bottom plate to

remove it.

Fig.1

4. Removing the fan case (Fig.2)(1) Remove the four fixing screws on the fan case to remove

it.

Fig.2

5. Removing the fan and fan motor (Fig.3)(1) Remove the two fixing screws and attachment on the fan

motor.

(2) Pull out the fan motor in the direction of the arrow.

Exercise caution when removing heavy parts.

Fig.3

6. Precautions for reinstalling the removed motor in its orig-inal position

(1) As shown in Fig. 4, reinstall the motor cable in its original position and reset it on the control board.

(2) Fix the motor in place so that the heat radiating fins on the motor and the stopper of the motor leg are positioned as shown in Fig. 5.

Fig.4

Fig.5

Connector CNMF1

Heat radiating finsViewed from left

Stopper


- 26 -HWE1804A GB

3. LEV, thermistor (Liquid/Gas piping temperature detection)Be careful on removing heavy parts.

1. Removing the LEV.(1) Remove the control box cover with procedure [1]-1.

(2) Remove the fixing screws (five) of the heat exchanger cover (A), and remove the cover (A). (Fig.1)

(3) Remove the LEV driving motor. (Fig.2)

2. Removing the liquid pipe and gas pipe thermistor.(1) Remove the thermistors from the thermistor holders

which are installed on the piping. (Fig.3)

3. Removing the outlet air temperature thermistor.(1) Remove control box cover with procedure [1]-1.

(2) Remove the fixing screws (five) of the heat exchanger cover (A), and remove the cover (A). (Fig.1)

(3) Remove the fixing screws (four) of maintenance cover (B), and remove the cover (B). (Fig.1)

(4) Remove the cable bush from the panel, and pull the outlet air temperature thermistor through the hole. (Fig.4)

Fig.1

Fig.2

Fig.3

Fig.4

(A)

(B)

LEV

Thermistor

Cable bush


- 27 -HWE1804A GB

4. Drain pump

1. Remove the fixing screws shown in Fig. 1, and remove the control box cover.

Fig.1

2. Remove the connector from CN4F and CNP on the con-trol board, shown in Fig. 2.

Fig.2

3. Remove the fixing screws shown in Fig. 3, and remove the maintenance cover.

Fig.3

4. Remove the fixing screws holding the drain hose and the drain pump assy shown in Fig. 4.

Fig.4

5. Remove the fixing screws and cut the band shown in Fig. 5, by doing so, the drain pump and the float switch can be disassembled.

Fig.5

Control box cover

Fixing screw

Fixing screw

Fixing screw

Float switch wire(clear wire)

Wire saddle

Wire saddle

IndoorP.C. board

CNP White

CN4F WhiteSW1

Band

Drain pump wire(Black wire)

Maintenancecover

Band

Fixing screws


- 28 -HWE1804A GB

5. Heat exchangerBe careful on removing heavy parts.

1. Removing the heat exchanger.(1) Remove the heat exchanger cover (A) with procedure

[1]-3-1.

(2) Remove the bottom plate which is air outlet side. (fixing screws: twelve) (Fig.1)

(3) Remove the drainpan. (Fig.2)

(4) Remove the cover (A), (B). (fixing screws: two x 2) (Fig.3)

Fig.1

Fig.2

Fig.3

Bottom plate

Drainpan

Fixing screws

Fixing screws

Cover(A) Cover(B)


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(5) Remove the maintenance cover. (fixing screws: four) (Fig.4)

(6) Remove the heat exchanger. (fixing screws: two) (Fig.5,6)

*Removed heat exchanger is as shown in Fig.7

Fig.4

Fig.5

Fig.6

Fig.7

Fixing screws

Maintenance cover

Fixing screws

Fixing screws


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6. Control box inside layout

Power source terminal bed

Transmission terminal bed

AC reactor

Diode bridge


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7. Thermistor position

Liquid piping thermistor

PEFY-P36, 48NMHU-E-OA

Gas piping thermistor


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[2] Disassembly Procedure (PEFY-P72, 96NMHU-E-OA)

1. Control boxBe careful on removing heavy parts.

1. Removing the control box cover(1) Remove the fixing screws (two) of the control box (A), and

remove the cover. (Fig.1)

*At this stage, the following servicing is possible. (Fig.2)

1) Operation and check of the switches (listed below) which are on the control board.Dip switch SW1 . . . . . . . . . . . . Function changeDip switch SW2 . . . . . . . . . . . . Capacity code settingDip switch SW3 . . . . . . . . . . . . Function changeDip switch SW4 . . . . . . . . . . . . Model code settingDip switch SW21 . . . . . . . . . . . Static pressure settingDip switch SW22 . . . . . . . . . . . Function settingRotary switches SW11, 12 . . . . Address settingRotary switch SW14 . . . . . . . . . Branch port setting

2) Connection check of the lead wires (listed below) which are connected to the controller board.Power supply lead wire.Transmission lead wire x 2Fan motor lead wire.LEV lead wireInlet air temperature thermistor lead wireOutlet air temperature thermistorLiquid piping temperature thermistor lead wireGas piping temperature thermistor lead wireDrain pump lead wireFloat switch lead wire

3) Control board exchange4) Reactor exchange5) Thermistor (inlet air, outlet air, liquid piping, gas piping)

exchange6) Power supply terminal bed exchange7) Transmission terminal bed exchange x 28) Ferrite core exchange

A ferrite core is attached to the wire only when the model of fan motor is KMUC4E3MW. The model of the motor is noted in the nameplate on the fan motor casing.

Fig.1

Fig.2

Fixing screws(A)


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2. Fan and fan motorBe careful on removing heavy parts.Electric shock hazard. Before performing any work, shut off the power supply.

1. Remove the control box cover according to the procedure in section [2]-1. Control box.

2. Removing the fan motor cable(1) Disconnect the connector (CNMF1) from the control

board and remove the ferrite core from the cable (Fig. 2).A ferrite core is attached to the wire only when the model of fan motor is KMUC4E3MW. The model of the motor is noted in the nameplate on the fan motor casing.

(2) Remove the cable through the rubber bush.

3. Removing the bottom plate(1) Remove the thirteen fixing screws on the bottom plate to

remove it. Fig.1

Fig.2

4. Removing the fan case(1) Remove the eight fixing screws on the fan case to re-

move it (Fig. 3).

Fig.3

CNMF1

CNMF1Ferrite core


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5. Removing the fan and fan motor(1) Remove the grounding wire of the motor wire from the

motor base (Fig. 4).The grounding wire of the motor wire is found only on the KMUC4E3MW. The model of the motor is noted in the nameplate on the fan motor casing.

(2) Remove the two fixing screws and attachment on the fan motor (Fig. 5).

(3) Pull out the fan motor in the direction of the arrow (Fig. 5). Fig.4

Exercise caution when removing heavy parts.

Fig.5

6. Precautions for reinstalling the removed motor in its orig-inal position

(1) As shown in Fig. 6, reinstall the motor cable in its original position and reset it on the control board.

(2) Fix the motor in place so that the heat radiating fins on the motor and the stopper of the motor leg are positioned as shown in Fig. 7.

Fig.6

Fig.7

Protruding portion

Stopper

Viewed from left


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3. LEV, thermistor (Liquid/Gas piping temperature detection)Be careful on removing heavy parts.

1. Removing the LEV.(1) Remove the control box cover with procedure [2]-1.

(2) Remove the fixing screws (three) of the heat exchanger cover (A), and remove the cover (A). (Fig.1)

(3) Remove the LEV driving motor. (Fig.2)

2. Removing the liquid pipe and gas pipe thermistor.(1) Remove the thermistors from the thermistor holders

which are installed on the piping. (Fig.3)

3. Removing the outlet air temperature thermistor.(1) Remove control box cover with procedure [2]-1.

(2) Remove the fixing screws (three) of the heat exchanger cover (A), and remove the cover (A). (Fig.1)

(3) Remove the fixing screws (four) of maintenance cover (B), and remove the cover (B). (Fig.1)

(4) Remove the cable bush from the panel, and pull the outlet air temperature thermistor through the hole. (Fig.4)

Fig.1

Fig.2

Fig.3

Fig.4

(A)(B)

LEV

Thermistor

P96P72 Thermistor

Cable bush


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4. Drain pump

1. Remove the fixing screws shown in Fig. 1, and remove the control box cover.

Fig.1

2. Remove the connector into CN4F and CNP on the control board shown in Fig. 2.

Fig.2

3. Remove the fixing screws shown in Fig. 3, and remove the wire cover.

Fig.3

4. Remove the fixing screws shown in Fig. 4, and remove the maintenance cover.

Fig.4

Fixing screwControl box cover

Fixing screw

Wire saddleFloat switch wire (clear tube)

Indoor P.C. board

Drain pump wire(Black tube)

CNP White

CN4F WhiteSW1

Wire saddle

Clamp Hole

Wire cover

Fixing screws

Fixing screw

Maintenance cover


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5. Remove the fixing screws holding the drain hose and the drain pump assy shown in Fig. 5.

Fig.5

6. Remove the fixing screws and cut the band shown in Fig. 6, by doing so, the drain pump and the float switch can be disassembled.

Fig.6

Band


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5. Heat exchangerBe careful on removing heavy parts.

1. Removing the heat exchanger.(1) Remove the heat exchanger cover (A) with procedure

[2]-3-1.

(2) Remove the bottom plate which is air outlet side. (fixing screws: twelve) (Fig.1)

(3) Remove the drainpan. (Fig.2)

(4) Remove the two fixing screws. (Fig.3)

Fig.1

Fig.2

Fig.3

Bottom plate

Drainpan

Fixing screws


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(5) Remove the maintenance cover. (fixing screws: four) (Fig.4)

(6) Remove the heat exchanger. (fixing screws: two) (Fig.5)

*Removed heat exchanger is as shown in Fig.6

Fig.4

Fig.5

Fig.6

Maintenance cover

Fixing screws


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6. Control box inside layout

A ferrite core is attached to the wire only when the model of fan motor is KMUC4E3MW. The model of the motor is noted in the nameplate on the fan motor casing.

Power source terminal bed Transmission terminal bed

AC reactor

Diode bridge

*Ferrite core


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7. Thermistor position



Gas piping thermistorGas piping thermistor

PEFY-P96NMHU-E-OAPEFY-P72NMHU-E-OA

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GBHWE1804A

Service Manual PEFY-P-NMHU-E-OA

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Transcript of Service Manual PEFY-P-NMHU-E-OA