Mitsubishi HWE07170 Service Manual

Air-Conditioners

TECHNICAL & SERVICE MANUAL

2007

Models

PFFY-P20VLRMM-E, PFFY-P40VLRMM-E
PFFY-P25VLRMM-E, PFFY-P50VLRMM-E
PFFY-P32VLRMM-E, PFFY-P63VLRMM-E

For use with the R410A

Safety Precautions

Read before installation and performing electrical work

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.

Symbol explanations

WARNING

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

CAUTION

This symbol indicates that failure to follow the instructions exactly as stated poses the risk of serious injury or dam-

age 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>

WARNING

Carefully read the labels affixed to the main unit.

WARNING

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 terminals 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.

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 according 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 result in malfunctions of the unit, electric
shock, or fire.

HWE07170 GB

ii

WARNING

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 installing 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 starvation. Consult your dealer before installing the
unit.

Consult your dealer or a qualified technician when moving
or reinstalling 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 defeating 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

CAUTION

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 copper. 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 deteriorate.

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.

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 refrigerator 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 vacuum pump oil may flow into the refrigerant cy­cle and cause the refrigerator oil to deteriorate.

Prepare tools for exclusive use with R 410A. 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.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of the refrigerant
in the cylinder 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.

HWE07170 GB

ii

CONTENTS

I Features

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

II Components and Functions

[1] Components and Functions...................................................................................................... 2

III Specfications

[1] Specifications............................................................................................................................ 4

1.Specfications .......................................................................................................................... 4

2.Electrical component specifications........................................................................................ 6

IV Outlines and Dimensions

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

V Wiring Diagram

[1] Wiring Diagram ......................................................................................................................... 8

VI Refrigerant System Diagram

[1] Refrigerant system diagram.................................................................................................... 10

VII Troubleshooting

[1] Troubleshooting ...................................................................................................................... 11

1.Check methods..................................................................................................................... 11

2.DC fan motor (fan motor/indoor control board)..................................................................... 15

3.Address switch setting .......................................................................................................... 16

4.Voltage test points on the control board ............................................................................... 17

5.Dipswitch setting (Factory setting)........................................................................................ 18

VIII Disassembly Procedure

[1] Disassembly Procedure.......................................................................................................... 21

1.Control box ........................................................................................................................... 21

2.Thermistor (Intake air) .......................................................................................................... 22

3.Drainpan ............................................................................................................................... 23

4.Thermistor (Gas pipe) (Liquid pipe) ...................................................................................... 25

5.Fan and fan motor ................................................................................................................ 26

6.Heat exchanger .................................................................................................................... 27

HWE07170 GB

HWE07170 GB

[ I Features ]

I Features

[1] Features

Model Cooling capacity/Heating capacity

kW

PFFY-P20VLRMM-E 2.2/2.5

PFFY-P25VLRMM-E 2.8/3.2

PFFY-P32VLRMM-E 3.6/4.0

PFFY-P40VLRMM-E 4.5/5.0

PFFY-P50VLRMM-E 5.6/6.3

PFFY-P63VLRMM-E 7.1/8.0

HWE07170 GB

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[ II Components and Functions ]

II Components and Functions

[1] Components and Functions

1. Indoor (Main) Unit

(A)

(A)

(A) Air

2. Remote Controller
[PAR-21MAA]

Once the operation mode is selected, the unit will remain in the selected mode until changed.

(1) Remote Controller Buttons

1 [Set Temperature] Button 7 [Vane Control] Button
2 [Timer Menu] Button 8 [Ventilation] Button

[Monitor/Set] Button [Operation] Button

3 [Mode] Button 9 [Check/Clear] Button

[Back] Button 10 [Test Run] Button

4 [Timer On/Off] Button 11 [Filter] Button

[Set Day] Button [ ] Button

5 [Louver] Button 12 [ON/OFF] Button

[Operation] Button 13 Position of built-in room thermistor

6 [Fan Speed] Button 14 [Set Time] Button

Keep the remote controller out of direct sunlight to ensure accurate measurement of room temperature.
The thermistor at the lower right-hand section of the remote controller must be free from obstructions to ensure accurate mea-

surement of room temperature.

HWE07170 GB

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[ II Components and Functions ]

(2) Remote Controller Display

A Current time/Timer time I Louver swing

B Centralized control indicator J Ventilation

C Timer OFF indicator K Filter sign

D Timer mode L Sensor position

E Operation mode display: COOL, DRY, AUTO,

FAN, HEAT

M Room temperature

F Function Lock indicator N Vane setting

G Preset temperature O Fan speed

H Power indicator

HWE07170 GB

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[ III Specfications ]

III Specfications

[1] Specifications

1. Specfications

Model PFFY-

P20VLRMM-E

PFFY-

P25VLRMM-E

PFFY-

P32VLRMM-E

Power supply Voltage V 220-240

Frequency Hz 50/60

Cooling capacity

Heating capacity

*1

*1

kW 2.2 2.8 3.6

kW 2.5 3.2 4.0

Power consumption Cooling kW 0.04/0.04 0.04/0.04 0.04/0.04

Heating kW 0.04/0.04 0.04/0.04 0.04/0.04

Current consumption Cooling A 0.34/0.33 0.34/0.33 0.38/0.37

Heating A 0.34/0.33 0.34/0.33 0.38/0.37

External finish (Munsel No.) Galvanized steel plate

Dimensions Height mm 639

Width mm 886 1006

Depth mm 220

Net weight

*2

kg 18.5 18.5 20

Heat exchanger Cross fin (Aluminium fin and cupper tube)

Fan Type Sirocco fan x 1 Sirocco fan x 2

3

Airflow rate

/min 4.5-5.5-6.5 4.5-5.5-6.5 6.5-7.5-9.0

m

(Low-Mid-High)

External static pressure Pa 20-40-60

Motor Output kW 0.096 0.096 0.096

Air filter PP Honeycomb fabric

Refrigerant pipe di­mensions

Gas (Brazed connection) mm

[in.]

Liquid (Brazed connection) mm

ø12.7 [ø1/2]

ø6.35 [ø1/4]

[in.]

Drain pipe dimensions mm

Accesory hose ø27 [1-3/32] (top end : ø20 [13/16])

[in.]

Operating noise
(Low-Mid-High)

20Pa dB (A) 31-36-40 31-36-40 27-32-37

40Pa 34-39-42 34-39-42 30-35-41

60Pa 35-40-43 35-40-43 32-37-42

*1 Cooling/Heating capacity indicates the maximum value at operation under the following condition,
<Cooling> Indoor temperature: 27°CDB/19°CWB (81°FDB/66°FWB Outdoor temperature: 35°CDB (95°FDB)
<Heating> Indoor temperature: 20°CDB (68°FDB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)
*2 The external static pressure is set to 20Pa at factory shipment.
*3 The actual capacity characteristics vary with the combination of indoor and outdoor units. See the technical information.
*4 The noise level in operation is measured at 1m apart from the front side and the bottom side of the unit in anechoic room.

(Noise meter A-scale value) Connect the duct of 1m in length to the air outlet.

HWE07170 GB

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[ III Specfications ]

Model PFFY-

P40VLRMM-E

PFFY-

P50VLRMM-E

PFFY-

P63VLRMM-E

Power supply Voltage V 220-240

Frequency Hz 50/60

Cooling capacity

Heating capacity

*1

*1

kW 4.5 5.6 7.1

kW 5.0 6.3 8.0

Power consumption Cooling kW 0.05/0.05 0.05/0.05 0.07/0.07

Heating kW 0.05/0.05 0.05/0.05 0.07/0.07

Current consumption Cooling A 0.43/0.42 0.48/0.47 0.59/0.58

Heating A 0.43/0.42 0.48/0.47 0.59/0.58

External finish (Munsel No.) Galvanized steel plate

Dimensions Height mm 639

Width mm 1006 1246

Depth mm 220

Net weight

*2

kg 21 25 27

Heat exchanger Cross fin (Aluminium fin and cupper tube)

Fan Type Sirocco fan x 2

3

Airflow rate

/min 8.0-9.5-11.0 10.0-12.0-14.0 11.0-13.0-15.5

m

(Low-Mid-High)

External static pressure Pa 20-40-60

Motor Output kW 0.096 0.096 0.096

Air filter PP Honeycomb fabric

Refrigerant pipe di­mensions

Gas (Brazed connection) mm

[in.]

Liquid (Brazed connection) mm

ø12.7 [ø1/2] ø15.88 [ø5/8]

ø6.35 [ø1/4] ø9.52 [ø3/8]

[in.]

Drain pipe dimensions mm

Accesory hose ø27 [1-3/32] (top end : 20 [13/16])

[in.]

Operating noise
(Low-Mid-High)

20Pa dB (A) 30-36-40 32-37-41 35-40-44

40Pa 32-38-42 35-40-44 36-42-47

60Pa 35-39-44 36-41-45 38-43-48

*1 Cooling/Heating capacity indicates the maximum value at operation under the following condition,
<Cooling> Indoor temperature: 27°CDB/19°CWB (81°FDB/66°FWB Outdoor temperature: 35°CDB (95°FDB)
<Heating> Indoor temperature: 20°CDB (68°FDB) Outdoor temperature: 7°CDB/6°CWB (45°FDB/43°FWB)
Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)
*2 The external static pressure is set to 20Pa at factory shipment.
*3 The actual capacity characteristics vary with the combination of indoor and outdoor units. See the technical information.
*4 The noise level in operation is measured at 1m apart from the front side and the bottom side of the unit in anechoic room.

(Noise meter A-scale value) Connect the duct of 1m in length to the air outlet.

HWE07170 GB

- 5 -

[ III Specfications ]

2. Electrical component specifications

Component Sym-

PFFY-P20VLRMM-E PFFY-P25VLRMM-E PFFY-P32VLRMM-E

bol

Room temperature
thermistor

TH21

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

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

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

Fuse FUSE 250V 6.3A

Fan motor

8-pole, Output 96W SIC-70CW-D896-3

8-pole, Output 96W

SIC-70CW-D8114-4

Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~1400 pulse)

Power supply terminal
block

Transmission terminal
block

Component Sym-

TB2

TB5

TB15

(L, N, ) 330V 30A

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

PFFY-P40VLRMM-E PFFY-P50VLRMM-E PFFY-P63VLRMM-E

bol

Room temperature
thermistor

TH21

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

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

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

Fuse FUSE 250V 6.3A

Fan motor 8-pole, Output 96W SIC-70CW-D8114-4

Linear expansion valve LEV 12VDC Stepping motor drive port diameter ø3.2 (0~1400 pulse)

Power supply terminal
block

Transmission terminal
block

TB2

TB5

TB15

(L, N, ) 330V 30A

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

HWE07170 GB

- 6 -

[ IV Outlines and Dimensions ]

IV Outlines and Dimensions

[1] Outlines and Dimensions

1. PFFY-P20, 25, 32, 40, 50, 63VLRMM-E

77 35

B(Wall mounting hole pitch)

88

10333

175

G

68

2X2-12X16

Air outlet

A

C

E

120

4.7

2XF-

Duct mounting hole

29
10

8

49

98 30

220

84

Control box

Wall mounting hole

Refrigerant piping

brazing connection (liquid)

2

385 43

Drain pan

Sub drain pan

639

(Wall mounting hole pitch)

170 300

O.D.27mm(End O.D.20mm)

Drain hose(accessory)

400

75

344

Terminal bed(Transmission)

Knockout hole 27

Terminal bed(Power souce)

15

Air inlet

D

B(Floor mounting hole pitch)

15

45

76

2-12X16

Floor mounting hole

9

90

27

(Transmission wiring)

(Power souce wiring)

Knockout hole

106

hole pitch
Floor mounting

Liquid pipe

Gas pipe

G

F

E

D

C

Air filter

6.35

12.7

780

660

5

4

480

360

730

610

692

572

9.52

15.88

1020

7

720

970

932

4.7

2-

387

B

760

640

A

886

1006

1000

1246

Duct mounting hole

4 pcs.(attached)

Level adjusting screw

1

Refrigerant piping

brazing connection (gas)

HWE07170 GB

- 7 -

Model

PFFY-P25VLRMM-E

PFFY-P20VLRMM-E

Dimensions

PFFY-P63VLRMM-E

PFFY-P32VLRMM-E

PFFY-P40VLRMM-E

PFFY-P50VLRMM-E

[ V Wiring Diagram ]

V Wiring Diagram

[1] Wiring Diagram

1. PFFY-P20,25,32,40,50,63VLRMM-E

TO MA REMOTE

CONTROLLER

TO OUTDOOR UNIT

BC CONTROLLER

REMOTE CONTROLLER

PULL BOX

FUSE (16A)

BREAKER (16A)

TO NEXT INDOOR UNIT

only PFFY-P63VLRMM-E

1

2

TB15

S(SHIELD)

INSIDE SECTION OF CONTROL BOX

SWA

SW5 SWC

C

B

D

A

E

9

F

8

0

7

1

6

2

3

5

4

8

7

6

9

0

5

4

1

2

3

8

7

6

9

0

5

4

1

2

3

A.B.

SW7

SW14

(Connection No.)

SW12

(10’s digit)

SW11

(1’s digit)

SW1

CN82

CN62

M2

56781234432

1

M1

TB5

51324

13

DSA

CND

(Black)

12

CN2M

SW2SW4SW3

CN42CN81CN32

81324

567

(Blue)

ON

OFF

(Red)

(Red)

L1

U

ZNR02

CN90

SWE

LED2

FUSE

U

ZNR01

340V

~

Rectify circuit

DC310

(Red)

CN27

LED1

L

N

1456

CNMF

7

(Red)

12

CN20CN44CN41CN52

CN4F

1324

4231

CN51

TB2

M

1312654321

220,230,240V

POWER SUPPLY

~

50,60Hz

Fan motor

TH21

t°

TH23

t°

TH22

t°

M

LEV

2

CN60

3

(Green)

654

(Blue)

CN3A

3

I.B.

HWE07170 GB

1

1

- 8 -

[ V Wiring Diagram ]

Table.1 SYMBOL EXPLANATION

SYM-

BOL

NAME SYM-

BOL

NAME SYM-

BOL

I.B. Indoor control board CN32 Connector (Remote switch) SW4

(I.B.)

A.B. Address board CN41 Connector (HA terminal-A) SWE

(I.B.)

TB2 Power supply terminal block CN51 Connector (Centralized con-

trol)

SW1

(A.B.)

TB5 Transmission terminal block CN52 Connector (Remote display) SW5

(A.B.)

TB15 Transmission terminal block CN90 Connector (Wireless) SW7

(A.B.)

FUSE Fuse AC 250V 6.3A TH21 Thermistor (inlet air) SW11

(A.B.)

ZNR01,02Varistor TH22 Thermistor (liquid pipe) SW12

(A.B.)

DSA Arrester TH23 Thermistor (gas pipe) SW14

(A.B.)

L1 AC reactor (Power factor im-

provement)

SW2
(I.B.)

Switch (capacity code setting) SWA

(A.B.)

NAME

Switch (model setting)

Connector (emergency opera­tion)

Switch (function setting)

Switch (function setting)

Switch (model setting)

Switch (For setting the 1's digit
in the address)

Switch (For setting the 10's
digit in the address)

Switch (connection No.set­ting)

Switch (static pressure set­ting)

CN27 Connector (Damper) SW3

Switch (function setting) SWC

(I.B.)

LEV Electronic linear expan.valve

Note 1 Wiring to TB2, TB5, and TB15 indicated by the double-dashed lines is on-site work.

2 terminal block, connector.

Table.2 OPERATION OF LED FOR INDOOR CIRCUIT BOARD SERVICE

SYMBOL LED operation under normal state

LED1 At applying main power source -> Lighting

LED2 At receiving MA transmission power source -> Lighting

(A.B.)

Switch (static pressure set­ting)

HWE07170 GB

- 9 -

[ VI Refrigerant System Diagram ]

VI Refrigerant System Diagram

[1] Refrigerant system diagram

(A)

(B)

(G)

(D)

(H)

(C)

(F)

(I)

(A) Gas pipe thermistor TH23

(B) Gas pipe

(C) Liquid pipe

(D) Brazed connections

(E) Strainer (#100 mesh)

(F) Linear expansion valve

(G) Liquid pipe thermistor TH22

(H) Heat exchanger

(I) Room temperature thermistor TH21

Capacity PFFY-P20, 25, 32, 40, 50VLRMM-E PFFY-P63VLRMM-E

Gas pipe ø12.7 [1/2] ø15.88 [5/8]

Liquid pipe ø6.35 [1/4] ø9.52 [3/8]

(E)(E)

HWE07170 GB

- 10 -

[ VII Troubleshooting ]

VII Troubleshooting

[1] Troubleshooting

1. Check methods

1. Component and check points

(1) Thermistor

Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)

Disconnect the connector and measure the resistance between terminals with a tester.
(Ambient temperature 10°C - 30°C)

Normal Abnormal

4.3k - 9.6k Open or short

(Refer to the thermistor characteristic graph below.)

1) Thermistor characteristic graph

Low-temperature thermistor

Room temperature thermistor (TH21)
Liquid pipe thermistor (TH22)
Gas pipe thermistor (TH23)

50

Thermistor R
Multiplier of B = 3480 k 2%

Rt = 15 exp { 3480( ) }

= 15 k 3%

0

1

273+t

1

273

40

30

0°C 15k
10°C 9.6k
20°C 6.3k
25°C 5.2k
30°C 4.3k

(B)

20

40°C 3.0k

(A) Temperature (°C)

(B) Resistance (k )

10

0

-20 -10 0 10 20 30 40 50

(A)

(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

150 k 10%

LEV

(F)

(E)

(D)

(C)

(B)

(A)

CN60

1
2
3
4
5
6

1-5 2-6 3-5 4-6 Open or short

White-Red Yellow-Brown Orange-Red Blue-Brown

(A) Brown (D) Orange

(B) Red (E) Yellow

(C) Blue (F) White

HWE07170 GB

- 11 -

[ VII Troubleshooting ]

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

(G)

12VDC

(J)

(C)

4

(A)

6

(E)

2

3

1

(F)

(B)

M

5

(D)

(A) Brown (F) White

(B) Red (G) Control board

(C) Blue (H) Connection (CN60)

(D) Orange (I) Drive circuit

(E) Yellow (J) Linear expansion valve

Pulse signal output and valve operation

Phase

number

1234

Output pulse

ø1 ON OFF OFF ON

ø2 ON ON OFF OFF

ø3 OFF ON ON OFF

ø4 OFF OFF ON ON

(A)

(B)

(C)

(D)

(E)

(F)

(H)

6

5

4

3

2

1

(I)

The output pulse changes in the following order:
When the valve closes 1 -> 2 -> 3 -> 4 -> 1

When the valve opens 4 -> 3 -> 2 -> 1 -> 4

When 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.

HWE07170 GB

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[ VII Troubleshooting ]

2) LEV operation

(a) Close

(b) Open

(c) Fully open valve (2000 pulses)

(d) No. of pulses

(a)

(f)

(b)

(c)

(d)

(e)

(e) Extra tightning (0 - 200 pulse)

(f) Valve opening degree

When the power is turned on, a pulse signal of 2200 pulses 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

Symptom Checking Criteria Remedy

Circuit failure on
the microcomputer

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

6

5

4

3

2

1 k

LED

1

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.

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.

Disconnected or
shorted LEV motor

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

coils

Replace the in­door control
board if driving
circuit failure is
detected.

Replace the LEV.

Replace the LEV.

HWE07170 GB

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[ VII Troubleshooting ]

Symptom Checking Criteria Remedy

Valve closure fail­ure (leaky valve)

Misconnections of
connectors or con­tact failure

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.

(A) Termistor (TH21)

(A)

LEV

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 unnec­essary unless it is causing a problem.

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

Replace the LEV
if the amount of
leakage is great.

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

HWE07170 GB

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[ VII Troubleshooting ]

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 (CNMF).
Do not unplug the connector CNMF with the unit energized to avoid damage to the indoor control board and fan motor.

2. Troubleshooting

Symptom: Indoor unit fan does not run.

Check fan motor connector contact
(CNMF).

Is the fan motor connector

No

Fix the connection.

(CNMF) fully inserted?

Yes

Check the power supply.

Measure the voltage at the indoor control board.

310 - 340VDC (same with the voltage between fan connector 1 (+) and 4(-))

Power supply voltage

V

DC

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.]

Is the voltage within the

No

Replace the indoor control board.

normal range?

Yes

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

FG.

V
(same with the voltage between fan connector 7 (+) and 4(-))

Are 0VDC and 15VDC

No

Replace the motor.

displayed alternately?

Yes

Replace the indoor control board.

HWE07170 GB

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[ VII Troubleshooting ]

3. Address switch setting

Make sure that power to the unit is turned off.

(A)

(B)

ON

OFF

(A) Indoor unit control board

(B) Factory setting (all models)

1. When using an ME remote controller, set the address with the rotary switches (SW11, SW12).

Address setting is not required when the unit remote controller is used.

On-site address setting is required for the indoor units to run.

ON

OFF

2. Address settings vary in different systems.
Refer to the section on address setting in the outdoor unit installation manual.

3. Address is set with a combination of SW12 (10's digit) and SW11 (1's digit).
To set the address to "3," set SW12 to "0" and SW11 to "3."

To set the address to "25," set SW 12 to "2" and SW 11 to "5."

HWE07170 GB

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[ VII Troubleshooting ]

4. Voltage test points on the control board

1. PFFY-P20, 25, 32, 40, 50, 63VLRMM-E

Fuse

CND

С25(*1)

CNMF

C951(*1)

PC941(*1)

Fuse Fuse(AC 250V 6.3A)

CND Power supply voltage (220 -

240VAC)

CN2M For M-NET transmission cable

connection (24 - 30VDC)

SWE Emergency operation

SW2 Capacity setting

SW4 Function setting

CN42 For address board connection

SW3 Function setting

CN81 For address board connection

CN32 Remote start/stop adapter

CN3A For MA remote controller cable

connection
(10 - 13 VDC (Between 1 and 3.))

CN52 Remote display

CN51 Centralized control

CN2M

SWE

SW2

SW4

CN42

SW3

CN81

CN32

LED1

CN3C
CN20

CN44

CN41

CN51

CN52

CN41 JAMA standard HA terminal A

CN44 Thermistor (liquid/gas tempera-

ture)

CN20 Thermistor (Inlet temperature)

CN3C Indoor-outdoor transmission

(0 - 24VDC)

CNMF Fan motor output

1 - 4: 310 - 340 VDC
5 - 4: 15 VDC
6 - 4: 0 - 6.5 VDC
7 - 4: Stop 0 or 15 VDC

Run 7.5 VDC
(0 - 15 pulse)

(*1)

Voltage on the (-) side of PC941

V

FG

and C25
(Same with the voltage between 7
(+) and 4 (-) of CNMF)

V

Voltage between the C25 pins

CC

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

Vsp Voltage between the C951 pins

0VDC (with the fan stopped)
1 - 6.5VDC (with the fan in opera­tion)
(Same with the voltage between 6
(+) and 4 (-) of CNMF)

LED2 CN3A CN60

HWE07170 GB

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[ VII Troubleshooting ]

5. Dipswitch setting (Factory setting)

1. Function setting

(1) SW1

Switch position Function Switch setting

ON OFF

1 Active Thermistor (Intake air ther-

mistor)

2 Filter clogging detection Available Unavailable

3 Filter life 2500 hr 100 hr

4 Outdoor air intake Enabled Disabled

5 Remote display Thermo-ON signal Fan output

6 Humidifier operation During heating mode During heating operation

7 Fan speed Low Very low

8 Fan speed at heating Thermo-OFF Preset fan speed Follows the setting of SW1-7

9 Auto restart after power failure Enabled Disabled

10 Power start/stop Enabled Disabled

1) Adress board

Built-in thermistor on the remote
controller

Indoor unit

Factory setting

(2) SW3

Switch position Function Switch setting

ON OFF

1 Unit type Cooling only Heat pump

2- - -

3- - -

4- - -

5- - -

6- - -

7- - -

8 Heating 4-deg up Disabled Enabled

1) Indoor control board
Dipswitch settings must be made while the unit is stopped.

Factory setting

PFFY-P20,25VLRMM-E PFFY-P32,40,50,63VLRMM-E

HWE07170 GB

- 18 -

[ VII Troubleshooting ]

2. Capacity code setting

(1) SW2

1) Indoor control board
Dipswitch settings must be made while the unit is stopped.

Factory setting
The switches are set to correspond to the unit capacity.

PFFY-P20VLRMM-E PFFY-P25VLRMM-E PFFY-P32VLRMM-E

PFFY-P40VLRMM-E PFFY-P50VLRMM-E PFFY-P63VLRMM-E

3. Model setting

(1) SW4

1) Indoor control board
Dipswitch settings must be made while the unit is stopped.

Factory setting

Note:
Changes made to the dipswitches SW1, SW2, and SW3 will become effective when the unit comes to a stop (remote controller
off). There is no need to power cycle the unit.

4. External static pressure

(1) SWA, SWC

1) Address board

Adderess board

<At delivery>

2

3
2

1

1

SWA SWC

External
static pressure

Factory
setting

20PaSWA, SWC

2

1 - 3
1 - 2

3
2

1

1

SWA SWC

2

3
2
1

(A)

(B)

1

40Pa

2

3
2

1

1

SWA SWC

60Pa

2

3
2

1

1

SWA SWC

SWA SWC

(A) Option

(B) Standard

Note:
Changes that are made to the dipswitches SWA and SWC immediately become effective regardless of the unit's operation
status (RUN/STOP) or the remote controller status (ON/OFF).

HWE07170 GB

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[ VII Troubleshooting ]

5. 1's and 10's digits

(1) SW11, SW12 (Rotary switch)

The use of a network remote controller (PAR-F27MEA) requires address setting.

1) Address board
Address settings must be made while the unit is stopped.

Factory setting

6. Connection No. setting

(1) SW14 (Rotary switch)

This switch is used when the unit connected to an R2 series of outdoor unit.

1) Address board

Factory setting

Note:
Changes to the dipswitches SW11, SW12 and SW14 must be made while the unit is stopped and the remote controller is OFF.

HWE07170 GB

- 20 -

[ VIII Disassembly Procedure ]

VIII Disassembly Procedure

[1] Disassembly Procedure

1. Control box

Exercise caution when removing heavy parts.

1. Removing the control box cover
(1) Remove the fixing screws (two) on the cover (A) to re-

move it.

(A)

HWE07170 GB

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[ VIII Disassembly Procedure ]

2. Thermistor (Intake air)

Exercise caution when removing heavy parts.

1. Removing the thermistor
(1) Pull out the thermistor holder (B) and thermistor (C) under

the control box.

(C)

(B)

HWE07170 GB

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[ VIII Disassembly Procedure ]

3. Drainpan

Exercise caution when removing heavy parts.

1. Removing the casing ass'y
(1) Remove the fixing screws(nine) of the plate(D) and remove

the plate.

2. Remove the drainpan cover

(D)

3. Remove the drainpan
(1) Remove the fixing screw of the both side frame.

(E)

(F)

HWE07170 GB

- 23 -

[ VIII Disassembly Procedure ]

(2) Remove the magnet plate (G),(H),(I) of the both frame,re-

move the tube (J).

(G)

(3) Slide the drainpan in the direction of the arrow 1.

(H)

(J)

(I)

HWE07170 GB

- 24 -

[ VIII Disassembly Procedure ]

4. Thermistor (Gas pipe) (Liquid pipe)

Exercise caution when removing heavy parts.

1. Removing the thermistor
(1) Remove the fixing screws (three),remove the cover (K)

and (L).

(2) Remove the thermistor (gas)(M) and thermistor(liquid)(N).

(K)

(L)

(M)

(N)

HWE07170 GB

- 25 -

[ VIII Disassembly Procedure ]

5. Fan and fan motor

Exercise caution when removing heavy parts.

1. Remove the plate(D) with procedure 3-1.

2. Remove the drainpan with procedure 3-2,3.

3. Sliding the fan section
(1) Remove the fixing screws(two).

(2) Slide the fan section in direction of the arrow 2.

4. Removing the fan motor
(1) Remove the fixing screws(three)(a) on both sides of the

fan casing(O) and turn the fan casing(O) in the upward di­rection (arrow 3).

(2) Remove the fan motor shaft fixing screw and remove the

fan casing(O) and sirocco fan.

(3) Remove the fixing screws(two)(b) of the motor fix-

tures(two) and remove the motor.

Notice:In case of the Model(PFFY-P32 - 63VLRMM-E) stick

out the motor shafts on both side of the motor.

(b)

(a)

fan motor shaft
fixing screw

(O)

HWE07170 GB

- 26 -

[ VIII Disassembly Procedure ]

6. Heat exchanger

Exercise caution when removing heavy parts.

1. Remove the plate(D) with procedure 3-1.

2. Removng the air diffuser ass'y
(1) Remove the fixing screws(eight) of the air diffuser ass'y(P)

and remove it.

3. Remove the cover1,2 with procedure 4-1.

4. Removing the Heat exchanger
(1) Remove the fixing screws(four) and remove the heat ex-

changer support.

(P)

(2) Remove the fixing screws(two) and remove the heat ex-

changer cover(Q).

(3) Remove the heat exchanger, moving from side to side.

(Q)

HWE07170 GB

- 27 -

Nov. 2007 HWE07170
Printed in Japan

New publication, effective Nov. 2007
Specifications subject to change without notice