Mitsubishi PKFY-P20VAM-A, PKFY-P25VAM-A Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

2001

No. OC254

Series PKFY

Indoor unit
[Model names] [Service Ref.]

PKFY-P20VAM-A PKFY-P20VAM-A
PKFY-P25VAM-A PKFY-P25VAM-A

Wall Mounted

INDOOR UNIT

R407C

CONTENTS

1. SAFETY PRECAUTION·····················3

2. PART NAMES AND FUNCTIONS······5

3. SPECIFICATION ·································7

4. OUTLINES AND DIMENSIONS ·········9

5. WIRING DIAGRAM···························10

6. REFRIGERANT SYSTEM DIAGRAM···11

7. TROUBLESHOOTING······················12

8. DISASSEMBLY PROCEDURE·········17

9. PARTS LIST ·····································20

R22

1

SAFETY PRECAUTION

Cautions for using with the outdoor unit which adopts R407C refrigerant.

· Do not use the existing refrigerant piping.

-The old refrigerant and lubricant in the existing piping contains a large amount of chlorine which may cause the lubricant
deterioration of the new unit.

· Use “low residual oil piping”.

-If there is a large amount of residual oil (hydraulic oil, etc.) inside the piping and joints, deterioration of the lubricant will result.

· Store the piping to be used during installation indoors with keep both ends sealed until just before brazing.
(Store elbows and other joints in a plastic bag.)

-If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and compressor trouble may result.

· Use ESTR , ETHER or HAB as the lubricant to coat flares and flange connection parts.

Use liquid refrigerant to seal the system.

-If gas refrigerant is used to seal the system, the composition of the refrigerant in the cylinder will change and performance

may drop.

· Do not use a refrigerant other than R407C.

-If another refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the lubricant deterioration.

· Use a vacuum pump with a reverse flow check valve.

-The vacuum pump oil may flow back into the refrigerant cycle and cause the lubricant deterioration.

3

Gravimeter

Unit

[1] Service tools

Use the below service tools as exclusive tools for R407C refrigerant.

No. Tool name Specifications

1 Gauge manifold ·Only for R407C.

·Use the existing fitting SPECIFICATIONS. (UNF7/16)

·Use high-tension side pressure of 3.43MPa·G or over.

2 Charge hose ·Only for R407C.

·Use pressure performance of 5.10MPa·G or over.

3 Electronic scale
4 Gas leak detector ·Use the detector for R134a or R407C.
5 Adapter for reverse flow check. ·Attach on vacuum pump.
6 Refrigerant charge base.
7 Refrigerant cylinder. ·For R407C ·Top of cylinder (Brown)

·Cylinder with syphon

8 Refrigerant recovery equipment.

[2] Notice on repair service

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of
liquid refrigerant.

[3] Refrigerant recharging

(1) Refrigerant recharging process

1Direct charging from the cylinder.

·R407C cylinder are available on the market has a syphon pipe.

·Leave the syphon pipe cylinder standing and recharge it.
(By liquid refrigerant)

(2) Recharge in refrigerant leakage case

·After recovering the all refrigerant in the unit, proceed to working.

·Do not release the refrigerant in the air.

·After completing the repair service, recharge the cycle with the specified amount of
liquid refrigerant.

4

2

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

˚C

CHECK

CHECK MODE

FILTER

TEST RUN
FUNCTION

˚C

1Hr.

NOT AVAILABLE

STAND BY
DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

Press this button to switch the cooler,
electronic dry (dehumidify), automatic
and heater modes.

OPERATION SWITCH button

This sets the room temperature. The
temperature setting can be performed
in 1: units
Setting range
Cooler 19: to 30:
Heater 17: to 28:

TEMP. ADJUSTMENT button

This switches between continuous
operation and the timer operation.

TIMER button

This switches between the operation
and stop modes each time it is pressed.
The lamp on this button lights during
operation.

ON/OFF button

Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.

CHECK-TEST RUN button

This switch the horizontal fan motion
ON and OFF.

(Not available for this model.)

LOUVER button

This adjusts the vertical angle of the
ventilation.

AIR DIRECTION button

This resets the filter service indication
display

FILTER button

This sets the current time, start time
and stop time.

TIME SETTING button

This sets the ventilation fan speed.

AIR SPEED button

PART NAMES AND FUNCTIONS

● Indoor Unit

PKFY-P20VAM-A
PKFY-P25VAM-A

Filter

Air intake grille

Air intake

Auto Vane

Guide vane

Air Outlet

● MA remote controller [PAR-20MAA]

● Once the operation of the unit is set, subsequent operations can only be performed by pressing the ON/OFF button

repeatedly.

● Operation buttons

5

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

˚C

CHECK

CHECK MODE

FILTER

TEST RUN
FUNCTION

˚C

1Hr.

NOT AVAILABLE

STAND BY
DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

● Display

CENTRALLY
CONTROLLED display

This indicates when the unit is con-

trolled by optional features such as
central control type remote

controller.

TIMER display

This indicates when the continuous

operation and time operation modes
are set.

It also display the time for the timer

operation at the same time as when
it is set.

OPERATION MODE display

This indicates the operation mode.

STANDBY display

The [STANDBY] symbol is only dis-

played from the time the heating
operation starts unit the heated air
begins to blow.

CLOCK display

The current time , start time and stop

time can be displayed in ten second
intervals by pressing the time switch
button. The start time or stop time is
always displayed during the timer
operation.

In this display example on the bot­tom left, a condition where all dis­play lamps light is shown for expla­nation purposes although this differs
from actual operation.

AIR DIRECTION display

This displays the air direction.

AIR SPEED display

The selected fan speed is displayed.

ROOM TEMPERATURE display
The temperature of the suction air

is displayed during operation. The

display range is 8°C to 39°C. The
display flashes 8°C when the actual
temperature is less than 8°C and
flashes 39°C when the actual tem­perature is greater than 39°C.

Operation lamp

This lamp lights during operation,
goes off when the unit stops and
flashes when a malfunction occurs.

DEFROST display

This indicates when the defrost
operation is performed.

CHECK MODE

TEST RUN

This display lights in the check
mode or when a test operation is
performed.

display

FILTER display

CHECK display

This indicates when a malfunction

has occurred in the unit which should
be checked.

SET TEMPERATURE display

This displays the selected setting

temperature.

Caution

● Only the Power display lights when the unit is stopped and power supplied to the unit.

● When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch button

and TEMP. adjustment button do not operate.

● “NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped
with the fan direction adjustment function and the louver function.

● When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For max.
2minutes). Please wait until this “H0” indication disappear then start the operation.

POWER display

This lamp lights when electricity is
supplied to the unit.

This lamp lights when the filter need
to be cleaned.

6

3

Power Supply

Starting Current

Fan ✕ No.
Air flow w 2
External static pressure
Fan motor output

Item
Power
Cooling capacity
Heating capacity

Exterior <munsell symbol>
Out dimensions

Heat exchanger

Fan

Insulator
Air filter

Pipe dimensions

Unit drain pipe size
Noise level w 2
Product weight

Unit

[,V,Hz

kW
kW
kW
kW

A
A

—
mm
mm
mm

—

—

K/min

Pa
kW

—

—

[mm(in.)
[mm(in.)

[mm

dB

kg

Cooling
Heating
Cooling
Heating

Height
Width
Depth

Gas side
Liquid side

PKFY-P20VAM-A

2.2

2.5

PKFY-P25VAM-A

2.8

3.2

0.04

0.04

0.20

0.20

Plastic munsell : <2.60Y 8.66/0.69>

295
815
158

Cross fin

Lineflow fan ✕ 1

5.9-5.6-5.2-4.9
0

0.017

Polyethylene sheet

PP honey comb

12.7 (1/2")

6.35 (1/4")

PVC pipe VP-16 connectable (I.D. 16)

36-35-33-32

8.5

Electric

characteristic

Single phase, 220-230-240V, 50Hz
Single phase, 220V, 60Hz

SPECIFICATION

3-1. Specification

Note 1. Rating conditions

Cooling :Indoor D.B. 27°C W.B. 19.0°C
Heating : Indoor D.B. 20°C

ww

2. Air flow and the noise level are indicated as High-Middium 1-Middium2-Low.

Outdoor D.B. 35°C W.B. 24°C
Outdoor D.B. 7°C W.B. 6°C

7

3-2. Electrical parts specifications

Parts name

Model

Symbol

TH21

TH22

TH23

FUSE

MF

C1

MV

LEV

TB2

TB5

Resistance 0:/15k", 10:/9.6k", 20:/6.3k", 25:/5.2k", 30:/4.3k", 40:/3.0k"

Resistance 0:/15k", 10:/9.6k", 20:/6.3k", 25:/5.2k", 30:/4.3k", 40:/3.0k"

Resistance 0:/15k", 10:/9.6k", 20:/6.3k", 25:/5.2k", 30:/4.3k", 40:/3.0k"

250V 6.3A

4-Pole Output 17W / RC4V17

1.5µF ✕ 440V

MSFBC20A76 DC12V

(L, N, ;) 250V 20A

(M1, M2) 250V 10A

Liquid pipe thermistor

Gas pipe thermistor

Fan motor capacitor

Linear expansion valve

PKFY-P20VAM-A PKFY-P25VAM-A

Room temperature
thermistor

Fuse
(Indoor controller board)

Fan motor
(with thermal fuse)

Vane motor
(with limit switch)

Power supply terminal
block

Transmission terminal
block

DC12V Stepping motor drive

Port [3.2 (0~2000pulse) EDM-402ME

8

4

783

C

D

B

CBA

D

25.513

Air intake dimension

Air intake dimension

Air outlet dimension

Drain pipe length

Gas pipe

Detail of Terminal block

Terminal block for transmission

Terminal block for

transmission

Terminal block for

power supply

Address board

Terminal block for power supply

Knock out hole for

right - hand side piping

Knock out hole

for left - hand

side piping

Knock out hole

for under piping

Liquid pipe

815

630

695

660

450

520

54

50

16

45 91.5

10

34

2.5

2.5 16

450

10

45

5

45

3

R15

R15

R15

R12

R8

R8

R8

10

24.4

116

110

60

146

295

21.5

247.5

150

2.5 60

13

Detail of knock out hole (A B C)

Secondary

Primary

Knock out hole

for the remote

controller wiring

Knock out hole for the

remote controller wiring

: In case of connecting MA remote controller, use the

cable with the connector attached to the indoor unit.

Please connect the cable with the connector with the

lead wire and connector (Relay connector) for the

MA remote controller of indoor controller board.

: There is no terminal board for MA remote controller.

Air intake dimension

A

159

407.5

328328

298

235

235

205

205

175

175

170

170

10

10

0

298

407.5

168

135

125

1103510

27.540536587

113

128

0

295

260

260

225

225

190

190
180

159

155

155

120

120

85

85

30

30

45

44 50

0

133

122.5

97.5

85

60

47.5

22.5

15

90

102.5

124

4-4.5✕35

4-4.5✕40

4-4.5✕37

4-11✕20

8- 4.3

0

72.5

Air intake dimension

Air intake

Installation plate

Knock out hole

Installation space

100 or more

20 or more

20 or more

130 or more

Address board

Drain pipe

Liquid pipe Flare connection 1/4F

Flare connection 1/2F

Gas pipe

Refrigerant

pipe

Address board is protected by

the plastic cover.

For the setting, remark 1-screw

using the screw driver.

Installation plate

Air outlet

angle

Air outlet

dimension

Air outlet direction

Detail of

address board

Dip switch

Terminal block

158

70.3

37.4

5

80

4- 9

12- 2.8

87- 5.1

65

17

3

1

1

Note1. For the installation, be sure to leave some space in case there

is fringe at edge of the ceiling.

Note2. Use the M10 or W3/8 bolt for the installation plate.

Note3. Refer for the specification table it below .

Connection inner dimension [16

Lotary switch(part No.)

Lotary switch(self address)

54 or more for left

or left back piping

Unit transplant parts

pipe hole

Position detail of the tapping screw and bats at pipe intake

Center of gravity hole for installation

OUTLINES AND DIMENSIONS

PKFY-P20VAM-A
PKFY-P25VAM-A

Unit : mm

9

5 WIRING DIAGRAM

12

to the connector . (Remote controller wire is non-polar.)

TB5

TB2

N

L

TO NEXT
INDOOR UNIT

PULL
BOX

FUSE
(15A)

~/N 220V 60Hz

~/N 220-230-240V 50Hz

BREAKER

(15A)

POWER SUPPLY

GRN/YLW

ORN

ORN

PKFY-P20VAM

Models

OFF

ON

Models SW2

<w1>

SW2

PKFY-P25VAM

4321

4321

OFF

ON

Mark
LED1
LED2

Meaning

Main power supply

Function

Power supply for
MA-Remote controller

LED on indoor board for service

Main power supply(Indoor unit:220-230-240V)
power on lamp is lit

Power supply for MA-Remote controller
on lamp is lit

3.

In case of using M-NET, please connect to TB5.(Transmission line is non-polar.)

In case of connecting MA-remote controller, please connect MA remote controller cable in an accessorie2.

CN35P

MICON
BOARD

(BLU)

CN53P

MICON
BOARD

(RED)

(BLU)

(RED)

POWER BOARD

POWER BOARD

CN53M

CN35M

CN43

ADDRESS

(RED)

(RED)

ADDRESS

CN82

SW5

220V 240V

3RD

DIGIT

2ND
DIGIT

1ST
DIGIT

CONNECTION
NO.

See fig: w1

(WHT)

CENTRALLY
CONTROL

(GRN)

REMOTE
INDICATION

(RED)

ADDRESS

(RED)

ADDRESS

(BLU)

CN20

INTAKE

(RED)

(BLU)

(GRN)

(RED)

BLU

RED

BLK

RED

WHT

BLU

BLU

M-NET REMOTE CONTROLLER

TO OUTDOOR UNIT
BC CONTROLLER

CONTROLLER

TO MA-REMOTE

LIQUID
(WHT)

(BLK)

GAS

(GRN)

PNK

YLW

ORN

BLU

RED

SWITCH

(WHT)

(WHT)

(WHT)

RED

WHT

YLW

ORN

BLU

BRN

6.

5.

4.

1.

Note

The setting of the SW2 dip switches differs in the capacity. For the detail,refer to the fig: w1.

Symbols used in wiring diagram above are, : terminal block, : connecter.

At servicing for outdoor unit, always follow the wiring diagram of outdoor unit.

Please set the switch SW5 according to the power supply voltage.
Set SW5 to 240V side when the power supply is 230 and 240 volts.
When the power supply is 220 volts, set SW5 to 220V side.

block

Terminal

Switch

Circuit board

Power supply

Transmission

Address board
Mode selection

Address setting 1st digit

Connection No.

Address setting 2nd digit

Name

Voltage selection

Vane motorMV

Fan motor

(0:/15T,25:/5.4T)

TB5

TB2

SW14<A.B>

SW12<A.B>

SW11<A.B>

SW1<A.B>

A.B

Pipe temperature,detection/Gas

Capacitor(fan motor)C1

MF

TH23

Thermistor

SW3

SW2 Switch

CN52

CN51

CN41

CN32

Indoor controller board

NameSymbol

M.B

Legend

Connector

Remote switch
HA terminal-A
Centrally control
Remote indication

Mode selection

Capacity code

P.B Indoor power board

Symbol Name Symbol

ZNR Varistor

Fuse (6.3A)FUSE
Fan phase controlF.C

(0:/15T,25:/5.4T)

Pipe temperature,detection/liquid

(0:/15T,25:/5.4T)

Room temperature,detection

Thermistor

TH21

TH22 Linear expansion valveLEV

SW5<A.B>

CN5V

(BLU)

CN41

HA

REMOTE

CN32 CN34 CN29

LEV

CN60

CN3A

CN81CN42

CN52CN51

12345678910

SW3

0FF

0N

1234

SW2

LED2

M.B

CN21

CN2M

M-NET

FAN

CND

C1

FUSE
250V

6.3A

8

4

ON

OFF

12345678910

SW1

SW12 SW11

SW14

A.B

00

0

LED1

TH22TH23 TH21

5

MF

M1M2

DC24-30V

DC8.7-13V

{

P.B

ZNR

F.C

MV

{

21

LEV

6

654321

12345

4321

123 123 1 2 21

32145 32145

4123

612345 78

31

12

13245

123

1

2

3

4

5

6

7

8

1

2

3

4

5
4

2

3
1

321

12

146

13

1

2

3

4

5

6

1
2
3
4
5

PKFY-P20VAM-A
PKFY-P25VAM-A

10

6

Strainer
(#100mesh)

Strainer
(#50mesh)

Heat exchanger

Room temperature thermistor
TH21

Gas pipe temperature thermistor
TH23

Liquid pipe temperature thermistor
TH22

Gas pipe

Liquid pipe

Flare

Linear expansion

valve

REFRIGERANT SYSTEM DIAGRAM

PKFY-P20VAM-A
PKFY-P25VAM-A

Item

Gas pipe

Liquid pipe

Models

PKFY-P20VAM-A, PKFY-P25VAM-A

{12.7 (1/2”)
{6.35 (1/4”)

11

7

White

Red

Black

Brown

Gray Yellow

CN34

1
4
6

321

FAN

1
2
3
4
5
6

LEV

White
Yellow

Orange
Blue

Red
Brown

CN60

Blue

Yellow
Red

Orange

Pink

3

5
1

4 2

Connect pin No.

M

TROUBLESHOOTING

7-1. How to check PKFY-P20VAM-A, PKFY-P25VAM-A

Part Name Check points

Room temperature
thermistor(TH21)

Liquid pipe temperature
thermistor(TH22)

Gas pipe temperature
thermistor(TH23)

Disconnect the connector, then measure the resistance using a tester.
(Surrounding temperature 10°C~30°C)

Normal

4.3k'~9.6k'

Abnormal

Open or short

(Refer to the next page for a detail.)

Vane motor

Fan motor

1Measure the resistance between the terminals using a tester.(Surrounding temperature 25:.)

1-2

Red-Pink

Normal

1-3

Red-Blue

1-4

Red-Orange

1-5

Red-Yellow

Abnormal

Open or short

400' ±7%

1Measure the resistance between the terminals using a tester.(Surrounding temperature 20:.)

Normal Abnormal

White-Black

Red-Black

2Without disassembling the parts, measure the electrical pressure of the gray wire(Signal line) and

brown wire (GND) while the power is on.

!At first, check if the electrical pressure is 12V between the

Normal

Abnormal

brown wire(GND) and yellow wire(VCC).

@Slowly start running the fan. It is normal if while the fan rotate once,

the electrical pressure change from 0V to12V then go back to 0V.

If the electrical pressure stay at around 0V or 10V, it means the fan
motor has the defects.

195'
200'

Open or short

Linear expansion
valve

Disconnect the connector then measure the resistance valve using a tester.
(Coil temperature 20°C)

(1)-(5)

White-Red

(2)-(6)

Yellow-

Normal

Brown

(3)-(5)

Orange-Red

(4)-(6)

Blue-Brown

Abnormal

Open or short

150' ±10%

12

<Thermistor Characteristic graph>

Thermistor for
lower temperature

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

Thermistor R0=15k' ±3%
Fixed number of B=3480k' ±2%

Rt=15exp { 3480( ) }

1

273+t

1

273

0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.2k'
30: 4.3k'
40: 3.0k'

< Thermistor for lower temperature >

50

40

30

Resistance (K")

20

10

0

-20 -10 0 10 20 30 40 50
Temperature (:)

Linear expansion valve

① Operation summary of the linear expansion valve.

• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.

• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the indoor controller board and the linear expansion valve>

Controller board

DC12V

Linear expansion valve

4

M

6

2

5

White

1

Red

3

Orange

Blue

Brown

Yellow

[4
[3

[2
[1

Brown

Red

Blue

Orange

Yellow

White

Connector(CN60)

Note : Since the number of the connector at the controller board side and the relay connector are different, follow the color of

the lead wire.

6
5

4
3

2
1

Drive circuit

[4
[3

[2
[1

13

<Output pulse signal and the valve operation>

D

A

E

B

C

Open

Extra tightning (80~100pulse)

Pulse number

2000 pulse
Opening a valve
all the way

Close

Valve position (capacity)

Thermistor

Linear
expansion
valve

Output

(Phase)

{1
{2
{3
{4

Linear expansion valve operation

➁

1
ON
ON

OFF
OFF

2

OFF

ON
ON

OFF

Output

3
OFF
OFF

ON
ON

4

ON
OFF
OFF

ON

Closing a valve : 1 → 2 → 3 → 4 → 1
Opening a valve : 4 → 3 → 2 → 1 → 4

The output pulse shift in above order.

❈ 1. When linear expansion valve operation stops, all output phase

become OFF.

2. At phase interruption or when phase does not shift in order,
motor does not rotate smoothly and motor lock, and vibrates.

❈ When the switch is turned on, 2200 pulse closing valve signal

will be send till it goes to

A point in order to define the valve

position.

When the valve move smoothly, there is no noise or vibration
occurring from the linear expansion valve ; however, when the
pulse number moves from E to A or when the valve is locked,
more noise can be heard than normal situation.

❈ Noise can be detected by placing the ear against the screw dri-

ver handle while putting the screw driver to the linear expansion
valve.

Trouble shooting

➂

Symptom

Operation circuit fail­ure of the micro
processor.

Linear expansion
valve mechanism is
locked.

Short or breakage of
the motor coil of the
linear expansion
valve.

Valve doesn't close
completely (thermis­tor leaking).

Wrong connection of
the connector or
contact failure.

Check points

Disconnect the connector on the controller board, then con­nect LED for checking.

LED1k’

Pulse signal will be sent out for 10 seconds as soon as the
main switch is turn on. If there is LED with lights on or lights
off, it means the operation circuit is abnormal.

Motor will idle and make ticking noise when motor is operated
while the linear expansion valve is locked. This ticking sound
is the sign of the abnormality.

Measure the resistance between the each coil (red-white,
red-orange, brown-yellow, brown-blue) using a tester. It is
normal if the resistance is in the range of 150'+10%.

To check the linear expansion valve, operate the indoor unit
in fan mode and at the same time operate other indoor units
in cooling mode, then check the pipe temperature <liquid

controller, it means the valve is not closed all the way. It is
not necessary to exchange the linear expansion valve, if the
leakage is small and not making any trouble.

Check the color of lead wire and missing terminal of the con­nector.

pipe temperature> of the indoor unit by the
outdoor multi controller board operation
monitor. During fan operation, linear
expansion valve is closed completely and if
there are some leaking, detecting tempera­ture of the thermistor will go lower. If the
detected temperature is much lower than
the temperature indicated in the remote

6
5
4
3
2
1

Countermeasures

Exchange the indoor con­troller board at drive circuit
failure.

Exchange the linear
expansion valve.

Exchange the linear
expansion valve.

If large amount of thermis­tor is leaked, exchange the
linear expansion valve.

Disconnect the connector
at the controller board,
then check the continuity.

14

7-2. FUNCTION OF DIP SWITCH
PKFY-P20VAM-A, PKFY-P25VAM-A

Switch Pole

1
2
3
4

SW1

Mode

selection

5
6
7
8
9

10

SW2

Capacity

code

1~4

switch

Function

Operation by switch

ON OFF

Thermistor<Intake temperature>
position

Filter clogging Provide Not provide
Filter sign indication 2,500 hr 100 hr
Air intake (Note 2) Not effective Not effective
Remote indication switching Thermostat ON signal indication Fan output indication
Humidifier control

Air flow at heat thermostat
OFF

Auto restart function Effective Not effective
Power ON/OFF Effective Not effective

MODEL SW2

PKFY-P20VAM-A

PKFY-P25VAM-A

Built-in remote controller

Fan operation at Heating mode Heat thermostat ON is operating

Low (Note 1) Extra low (Note 1)
Setting air flow (Note 1) Reset to SW1-7

ON

OFF

1234

ON

OFF

1234

Indoor unit

Remarks

Address board

<At delivery>

ON

OFF

12345678910

(Note 1) SW1-7=OFF, SW1-8=ON

→Setting air flow.
SW1-7=OFF, SW1-8=ON
→Indoor fan stop.

(Note 2) It is impossible to intake

the fresh air.

Indoor controller board

Set while the unit is off.

<At delivery>

Set for each capacity.

SW3

Function

selection

10

Heat pump/Cool only Cooling only Heat pump

1

Capacity save Available Not available

2

Vane Available Not available

3

Reading change of LEV opening

4

on reversion of after defrosting

Vane horizontal angle Second setting First setting

5

Vane cooling limit angle setting (Note 1)

6

Indoor linear expansion

7

valve opening

Heater 4 degreed up Not effective Effective

8

Target Superheat setting temperature

9

Target Subcool setting temperature

Not available Available

Horizontal angle Down B,C
Effective Not effective

9 degreed 6 degreed
15 degreed 10 degreed

Indoor controller board

Set while the unit is off.

<At delivery>

ON

OFF

12345678910

(Note 1) At cooling mode, each

angle can be used only 1
hour.

15

Operation by switchSwitch Remarks

220V

240V

220V

240V

SW11

1st digit

address

setting

SW12

2nd digit

address

setting

SW14

Connection

No.

Setting

SW5

Voltage

selection

Rotary switch

Rotary switch

2

SW12

0

1

9

8

7

6

5

10

2

3

4

SW14

0

1

F

E

D

C

B

A

8

9

SW11

9

8

7

6

1

2

3

4

5

6

7

Address board

Address can be set while the
unit is stopped.

0

1

5

Address setting should be done when M-NET

2

remote controller is being used.

3

4

<At delivery>

SW12

SW11

0

9

8

7

6

0

1

5

1

9

2

8

3

7

4

6

5

2

3

4

Address board

This is the switch to be used when the indoor
unit is operated with R2 series outdoor unit
as a set.

<At delivery>

SW14

0

1

2

F

3

E

4

D

5

C

6

B

7

A

8

9

Address board

If the unit is used at the 230V or 240V area,
set the voltage to 240V.
If the unit is used at the 220V, set the voltage
to 220V.

<At delivery>

16

8

Indoor unit
removing plate

Insert
the edge

Pull

Push

Corner hole

12

Push Down

Be careful
not to damage
the airflow
adjustment
plate with the
screw driver.

Push

4

13

2

DISASSEMBLY PROCEDURE

PKFY-P25VAM-A

OPERATION PROCEDURE

1. REMOVING THE LOWER SIDE OF THE INDOOR UNIT FROM
THE INSTALLATION PLATE

When there is removing plate
(1) Remove the corner box at right lower side of the indoor

unit.

(2) Insert the removing plate at the back side of the corner box

to remove the indoor unit.

(3) Remove the hook by pulling the lower side of the indoor unit

down as shown in the figure 1.

When there is no removing plate or it can not be used for some

reason.
(1) Remove the front panel.
(2) Insert the screw driver to the corner hole at both left and

right side as shown in the figure 2.

(3) Push it up then, pull down the lower side of indoor unit and

remove the hook.

Be careful on removing heavy parts.

PHOTOS & ILLUSTRATIONS

Figure 1 Figure 2

2. REMOVING THE FRONT PANEL

❈ Before removing the front panel, leave the open space at

upper side of air flow adjustment plate approximately 2 to 3
cm.

(1) Remove the screw caps then remove the set screws.

(Refer to the photo 1)
(2) Remove the left side of the front panel, then right side.
(3) After removing the lower side of the front panel a little,

remove it as pulling the upper side toward you.
❈ Please pay attention to the nozzle assemble.

INSTALLING THE FRONT PANEL
(1) Insert the lower side of the front panel under the air

adjustment plate.
(2) Set the upper side of the front panel.
(3) Set the lower side of the front panel then fix it with the

screws.

(4) Press the area indicated as arrow sign and set it to the air

conditioner unit.

Photo 1

Figure 3

Airflow adjustment plate

Front panel

Set screws

17

OPERATION PROCEDURE

PHOTOS & ILLUSTRATIONS

3. REMOVING THE INDOOR MICRO CONTROLLER BOARD
AND INDOOR POWER BOARD

(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover (screw 4 ✕ 10).

(Refer to the photo 2)

INDOOR MICRO CONTROLLER BOARD
(1) Disconnect the following connectors on the indoor micro

controller board.

(connector in front of)

● CN60, CN5V, CN34, CN29, CN21

● CN42, CN81, CN3A, CN20

(2) Pull out the indoor micro controller board toward you, then

disconnect the rest of connectors.

● CN53M, CN35M (See the photo 3)

INDOOR POWER BOARD
(1) Disconnect the following connectors on the indoor power

board.

● FAN, CN53P, CN35P, CN2M, CND

(2) Remove the screws of the indoor power board, then pull out

the indoor power board toward you. (See the photo 3)

Photo 2

Photo 3

Electrical box cover

Screw cap

Electrical box

Indoor micro controller board

Indoor power
board

Indoor power
board

4. REMOVING THE ELECTRICAL BOX

(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover.

(3) Pull the nozzle assembly toward you as opening the catch

of the nozzle assembly.
(4) Disconnect the indoor/outdoor connector.
(5) Disconnect the following connector on the indoor micro

controller board. (See the photo 4)

● CN60, CN5V, CN34, CN29, CN21, CN20, CN3A

(6) Disconnect the following connector on the indoor power

board. (See the photo 4)

● FAN, CN2M, CND
(7) Disconnect the ground wire.
(8) Pull the disconnected lead wire out from the electrical box.
(9) Push up the upper fixture catch to remove the box, then

pull the lower fixture and remove it from the box fixture.

Photo 4

Indoor micro
controller board

Ground wire set screw

Electrical box

fixture (upper)

Indoor power
board

fixture (lower)

Electrical box

18

OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS

5. REMOVING THE NOZZLE ASSEMBLY

(1) Remove the front panel (Refer to 2).
(2) Remove the electrical box cover.
(3) Disconnect the connector (CN5V) on the indoor micro con

troller board.

(4) After unhook the right side of the corner box, press the

upper left side and remove the corner box.

(5) Remove the nozzle assemble from the fixture.

(See the photo 5)

(6) Remove the drain hose.

Photo 5

fixture

Heat exchanger

Nozzle assembly

Electrical box

Drain hose

Drain hose

fixture

6. REMOVING THE LINE FLOW FAN AND THE FAN MOTOR

(1) Remove the front panel. (Refer to 2)
(2) Remove the nozzle assembly. (Refer to 5)
(3) Remove the electrical parts box.
(4) Remove the fixture while pressing the right side of motor

fixture catch. (See the photo 6)
(5) Remove the left side of the motor fixture.
(6) Loosen the screw which fixes the line flow fan to the fan

motor, then remove the fan motor by sliding it to the right

side. (See the photo 6)
(7) Pull the left-hand side of the heat exchanger toward you.

(See the photo 7)
(8) Remove the line flow fan.

7. REMOVING THE VANE MOTOR

(1) Remove the front panel.
(2) Remove the screw of the electrical parts box cover, and

remove the cover.

(3) Remove the screw of the vane motor, and remove the motor

from the shaft.

(4) Disconnect the vane motor connector (CN5V) on the indoor

controller board.

Heat exchanger

Photo 6

Line flow fan

set screws

Photo 7

Heat exchanger
fixture (left)

Photo 8

Heat exchanger

Vane motor

Vane motor connect
screws

Fan motor

fixture (right)

fixture (left)
fixture set screws

Drain hose

Nozzle assembly

Heat exchanger

Nozzle assembly

8. REMOVING THE LIQUID PIPE THERMISTOR AND GAS
PIPE THERMISTOR

(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover.
(3) Remove the pipe cover.
(4) Cut the wiring fixed band.
(5) Remove the liquid pipe thermistor and gas pipe thermistor.

(See the photo 9)

(6) Disconnect the connector (CN29) (CN21) on the indoor

micro controller board.

19

Photo 9

Heat exchanger

Liquid pipe thermis­tor

Gas pipe thermistor

Electrical box

9

1
2
3
4
5
6
7
8
9

10

BOX
FRONT PANEL
AIR FILTER
INTAKE GRILLE
SCREW CAP
RECEVING COVER
GRILLE CATCH
CORNER BOX
BACK PLATE
BRAND LABEL

No.

Parts No. Parts Name Specifications

PKFY-P20VAM-A
PKFY-P25VAM-A

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit

Amount

Q'ty / set Price

1
1
1
1
1
1
1
1
1
1

3PCS/SET
(DT25C174H03)

(BC79R798H02)

R01 22A 635
R01 22A 651
R01 22A 500
R01 22A 691
R01 22A 096

—
R01 22A 054
T7W A00 658
R01 22A 808

—

PARTS LIST

PANEL PARTS
PKFY-P20VAM-A
PKFY-P25VAM-A

Part number that is circled is not shown in the figure.

20

ELECTRICAL PARTS

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

FAN GUARD
NOZZLE
VANE MOTOR
AUTO VANE
DRAIN HOSE
MOTOR BAND
VANE SLEEVE
FUSE
ROOM TEMPERATURE THERMISTOR
ADDRESS BOARD
ADDRESS CABLE
TERMINAL BLOCK
TERMINAL BLOCK
ELECTRICAL BOX
POWER BOARD
I

NDOOR CONTROLLER BOARD
RUBBER MOUNT
PIPE TEMPERATURE THERMISTOR
PIPE TEMPERATURE THERMISTOR
FAN MOTOR
LINE FLOW FAN
SLEEVE BEARING
BEARING MOUNT
REMOTE CONTROLLER

SET (LEFT, RIGHT)

250V 6.3A

3P (

L, N, ;

)

2P (

M1, M2

)

GAS
LIQUID
RC4V17-AA

PAR-20MAA

No.

Parts No. Parts Name

Specifications

PKFY­P25VAM-A

PKFY­P20VAM-A

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit Amount

Q'ty / set Price

MV

FUSE

TH21

A.B

TB2
TB5

P.B

M.B

TH23
TH22

MF

R.B

1
1
1
1
1
1
1
1
1
1
1
1
1
1

1

1
2
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1
1
1
1
1
1
1

1

1
2
1
1
1
1
1
1
1

(BG00J285G16)

T7W B00 675
R01 22A 530
R01 22A 223
R01 22A 002
R01 22A 527
R01 22A 126
R01 07Y 092
T7W 520 239
T7W E12 202
T7W B01 294
T7W E00 304
T7W 512 716
T7W E05 716

—
T7W E03 313
R01 E27 310
R01 22A 105
R01 E38 202
T7W E06 202
T7W E11 762
R01 22A 114
R01 005 103
R01 22A 102

—

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

˚C

CHECK

CHECK MODE

FILTER

TEST RUN
FUNCTION

˚C

1Hr.

NOT AVAILABLE

STAND BY
DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

PKFY-P20VAM-A, PKFY-P25VAM-A

23 22 21 17 20 1719 18 141516

24

1

2

12

13

3

4

58 109 11

6 7

21

HEAT EXCHANGER PARTS

1

2

HEAT EXCHANGER
HEAT EXCHANGER
LINEAR EXPANSION VALVE

With connection pipe
With connection pipe

No.

Parts No. Parts Name Specifications

PKFY­P20VAM-A

PKFY­P25VAM-A

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Unit

Amount

Q'ty / set Price

T7W E83 480
T7W E84 480
R01 E27 401

1

1

1
1 LEV

PKFY-P20VAM-A
PKFY-P25VAM-A

1

2

22

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

cCopyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Feb. 2001. No. OC254 785
Made in Japan

New publication, effective Feb. 2001
Specifications subject to change without notice