Mitsubishi PKFY-P20VAM, PKFY-P25VAM Service Manual

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

CONTENTS

1. FEATURES·········································2

2. SAFETY PRECAUTION ·····················3

3. PART NAMES AND FUNCTIONS······4

4. SPECIFICATION·································6

5. OUTLINES AND DIMENSIONS ·········8

6. WIRING DIAGRAM·····························9

7. REFRIGERANT SYSTEM DIAGRAM···10

8. TROUBLESHOOTING······················11

9. DISASSEMBLY PROCEDURE·········16

10. PARTS LIST ·····································19

<Indoor unit>

PKFY-P20VAM
PKFY-P25VAM

No. OC163

1998

Models

Wall Mounted

Series PKFY

INDOOR UNIT

MODEL NAME

R407C

2

FEATURES

1

1. Compact 29.5cm high body fits snugly in even limited spaces.

2. Lightweight 8.5kg unit easy to transport and install.

3. Auto-flap shutter enhances good looks.

4. Front power supply box for easier wiring even after installation.

The front power supply box allows electrical wiring work to be done after the indoor unit has been installed. For easier
installation, all the screws required for securing the indoor unit to the wall are accessible from the front of the unit.

5. 5-way piping provides more flexibility in selecting installation sites.

All piping including drainage can be conned from the rear, right, base, left and left rear of the unit, providing much
greater flexibility in laying out piping and selecting installation sites.

Indoor unit

Wall Mounted

Series PKFY

Models

PKFY-P20VAM
PKFY-P25VAM

Cooling capacity/Heating capacity

W

2,300 / 2,600
2,900 / 3,300

kcal/h

2,000 / 2,250
2,500 / 2,800

3

2

SAFETY PRECAUTION

Precautions for devices that use R407C refriqerant.

Cautions for connecting with R407C outdoor unit.

.

Caution:

· Do not use R407C piping after use it for R22.

· Do not use the existing refrigerant piping.

-The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause the
refrigerator oil of the new unit to deteriorate.

· Use refrigerant piping made of C1220(CU-DHP) phosphorus deoxidized copper as specified in the JIS H3300
“Copper and copper alloy seamless pipes and tubes”. In addition, be sure that the inner and outer surfaces of the
pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other
contaminant.

-Contaminants on the inside of the refrigerant piping may cause the refrigerant residual oil to deteriorate.

· Store the piping to be used during installation indoors and keep both ends of the piping 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 ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.

-The refrigerator oil with degrade if it is mixed with a large amount of mineral oil.

· Use liquid refrigerant to fill 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 refrigerator oil to deteriorate.

· Use a vacuum pump with a reverse flow check valve. Evacuate sufficiently for one hour, leave it put for another one
hour and be sure not to down the vacuum degree.

· Do not use the following tools that are used with conventional refrigerants.

No. Tool name Specifications

1 Gauge manifold ·Only for R407C.

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

·Use high-tension side pressure of 35kgf/cm

2

or over.

2 Charge hose ·Only for R407C.

·

Use pressure performance of 52kgf/cm2or 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.

· Do not use a charging cylinder.

-Using a charging cylinder may cause the refrigerator to deteriorate.

· Be especially careful when managing the tools.

-If dust, dirt, or water gets in the refrigerant cycle, the refrigerant may deteriorate.

· For gas leak detecter, be sure to use it only for HFC refrigerant. (same as for R134a)

· If moving, put the cap on the flare at indoor unit side to prevent to mix dust or water.

· If measures on refrigerant leackage or repair servicing, be sure to refer the manual for outdoor unit.

4

PART NAMES AND FUNCTIONS

3

● Indoor Unit

PKFY-P20VAM
PKFY-P25VAM

● Remote controller [PAR-F25MA]

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

repeatedly.

TIMER button

This switches between continuous

operation and the timer operation

AIR SPEED button

The sets the ventilation fan speed.

● Operation buttons

TIMER SETTING button

This sets or switches the current

time, start time and stop time.

OPERATION SWITCH button

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

TEMP ADJUSTMENT button

This sets the room temperature. The
temperature setting can be
performed in 1°C units.

Setting range :

Cooler 19°C to 30°C
Heater 17°C to 28°C

CHECK-TEST RUN button

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

FILTER button

This resets the filter service
indication display

AIR DIRECTION button

This adjusts the vertical angle of the

ventilation.

ON/OFF button

This switches between the operation

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

The model name of the remote
controller is indicated.

LOUVER button

This switches the horizontal fan
motion ON and OFF.

(This button does not operate in this

model.)

Air intake grille

Air intake

Guide vane

Air Outlet

Aute Vane

Filter

5

Caution

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

● “NOT AVAILABLE” is displayed when the AIR DIRECTION button are pressed.This indicates that this room unit is not

equipped with the fan dieection adjustment function and the louver function.

● When the power is turned on, “‘HO” is indicated on the room temperature indication area for a while (maximum for 2
minute). It does not indicate a malfunction. Operation the unit after “‘HO” indication disappear.

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

CENTRALLY
CONTROLLED display

This indicates when the unit is

controlled by optional features such
as central control type remote
controller.

TIMER display

This indicates when the continous

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

This indicates when the standby

mode is set from the time the sleep
operation starts until the heating air
is discharged.

DEFROST display

This indicates when the defrost

operation is performed.

CHECK display

This indicates when a malfunction

has occurred in the unit which should
be checked.

CLOCK display

The current time , start time and stop

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

● Display

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.

Operation lamp

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

POWER display

This lamp lights when electricity is
supplied to the unit.

SET TEMPERATURE display

This displays the selected setting

temperature.

AIR DIRECTION display

This displays the air direction.

ROOM TEMPERATURE display

The temperature of the suction air is

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

display

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

CHECK MODE

TEST RUN

This lamp lights when the filter need
to be cleaned.

AIR SPEED display

The selected fan speed is displayed.

FILTER display

6

4

SPECIFICATION

2-1 Specification

Power Supply

Starting Current

Fan ✕ No.

Air flow (Note 2)

External stafic pressure

Fan motor output

Item

Power

Cooling capacity

Heating capacity

Exterior <munsell symbol>

Out dimensions

Heat exchanger

Fan

Insulator

Air filter

Pipe dimensions

Drain pipe size

Noise level

Product weight

Unit

[,V,Hz

Z/h

Z/h

kW

kW

A

A

—

mm

mm

mm

—

—

K/min

Pa

kW

—

—

[mm

[mm

[mm

dB (A)

kg

Cooling

Heating

Cooling

Heating

Height

Width

Depth

Gas side

Liquid side

PKFY-P20VAM

2,000

2,250

PKFY-P25VAM

2,500

2,800

Single phase ,220V-240V,50Hz

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 / 2F>

6.35 <1 / 4F>

Outer dimeter [28 Outer diameter of the connection

36-35-33-32

8.5

Electric

characteristic

Note 1. Rating conditions (JIS B8615)

Cooling : Indoor 27°C DB. 19.5°C WB

Outdoor 35°C DB. 24°C WB

Heating : Indoor 21°C DB.

Outdoor 7°C DB. 6°C WB

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

7

2-2 Electrical parts specifications

Model
Transformer

Room temperature thermistor

Liquid pipe

thermistor

Gas pipe

thermistor

Fuse
(Indoor controller board)
Fan motor
(with thermal fuse)
Fan motor capacitor

Vane motor
(with limit switch)
Liner expansion valve

Power supply terminal block

Transmission terminal block

Symbol

T

TH21

TH22

TH23

FUSE

MF

C1

MV

LEV

TB2

TB5

(Primary) 50/60Hz 220-240V (Secondry) (18.4V 1.2A)

Resistance:

0$C / 15k1, 10$C / 9.6k1, 20$C / 6.3k1, 25$C / 5.4k1, 30$C / 4.3k1, 40$C / 3.0k1

Resistance:

0$C/15k1, 10$C/9.6k1, 20$C/6.3k1, 25$C/5.4k1, 30$C/4.3k1, 40$C/3.0k1

250V 6.3A

4-Pole Output 17W / RC4V17

1.5+F ✕ 440V

MSFBC20A76 DC12V

DC12V Stepping motor drive

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

(L, N, ;) 264V 20A

(M1, M2,S ) 250V 10A

PKFY-P20VAM/PKFY-P25VAM

8

5

OUTLINES AND DIMENSIONS

Unit : mm

783

C

D

A

B

CBA

D

25.5

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

13

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

Insulation out dimention 28

Insulation Out dimention 35

Gas pipe

Refrigrant

pipe

Address board is protected by

the plastic cover.

For the setting, remark 1-screw

using the screw driver.

Installation plate

Air intake dimension

Air intake dimension

Air outlet dimension

Drain pipe length

Gas pipe

Detail of Terminal block

Terminal block for remote controller

Terminal block for

remote controller

Terminal block for

power supply

address board

Air outlet

angle

Air outlet

dimention

Air outlet direction

Detail of

address board

Dip swich

Terminal block

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

R

8

R8

R

8

10

24.4

116

110

60

146

295

21.5

247.5

150

158

70.3

37.4

5

2.5 60

13

80

4- 9

12- 2.8

87- 5.1

65

17

3

1

1

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

is finge at edge of the celing.

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

Note3. Refer for the specification table it below .

Detail of knock out hole (A B C)

Connection out dimention 28

Lotary switch(part No.)

Lotary switch(self address)

Secondry

Primary

Knock out hole

for the remote

controller wiring

Knock out hole for the

remote controller wiring

Control wire (30v)

: Follow the instruction stated at Note3 for

the connection with the control wire.

: There is no terminal board for contlroller.

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

Air intake dimention

PKFY-P20VAM,PKFY-P25VAM

9

WIRING DIAGRAM6

PKFY-P20VAM, PKFY-P25VAM

Legend

Symbol Name

TH23

Gas pipe thermistor
(0°C / 15k1, 25°C / 5.4k1)

P. B Indoor power board
ZNR Varistor
FUSE Fuse (6.3A)
F. C Fan phase control
T Transformer
MF Fan motor
C1 Fan motor capacitor
MV Vane motor
LEV Linear expansion valve

Symbol Name
M.B
CN32

Indoor controller board

Remote switch connector
CN41 HA terminal — A connector
CN51 Centrally control connector
CN52 Remote indication connector
SW2 Capacity cord switch
SW3 Function selector

TH21

Room temperature thermistor

(0°C / 15k1, 25°C / 5.4k1)

TH22

Liquid pipe thermistor.

(0°C / 15k1, 25°C / 5.4k1)

Symbol Name
TB2
TB5

Power supply terminal block

Transmission terminal block
A.B Address board
SW1 <A.B> Mode selector
SW5 <A.B> Voltage selector
SW11 <A.B>

1st digit address setting
SW12 <A.B>

2nd digit address setting
SW14 <A.B>

Connection No. setting

Note

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

2. Symbol [S] of TB5 is the shield wire connection.

3. Symbols used in wiring diagram above are, / : terminal block, [ : connector, ● : direct wire connection.

4. The setting of the SW2 dip switches differs in the capacity for the detail, see the table below.

5. Please set the switch SW5 accordng to the power supply voltage.
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.

[

ON

OFF

1234

MODELS SW2

PKFY-P20VAM

ON

OFF

1234

MODELS SW2

PKFY-P25VAM

<❈ 1>

BG79N652H01

A.B

220V 240V

ON

OFF

3RD
DIGIT

RED

PNK
BLU
ORN
YEL

BRN
RED
BLU
ORN
YEL
WHT

(RED)

ADDRESS

CN43

(RED)

ADDRESS

CN82

SW14

0

CONNECTION
NO.

SW5

SW1

2ND
DIGIT

MV

LEV

10987654321

SW11SW12

0

0

1ST

DIGIT

See fig:❈1

5

6

1

CN60

LEV
(WHT)

4

1

8

1

1

CENTRALLY
CONTROL

0FF

0N

(WHT)

SW3

SW2

5

CN51

4

8

21
3

987654
10

4321

M.B

123

CN32

REMOTE
SWITCH

(WHT)

4

1

REVOLUTION

(GRN)

123

CN33

CN81

ADDRESS

(RED)

POWER BOARD

12

261

CN29

CN21

GAS

LIQUID

(BLK)

8

15

CN53-M

CN35-M

POWER BOARD

1234

51

CN5V

HA

(BLU)

CN41
(WHT)

5

1

1

CN52

REMOTE
INDICATION

ADDRESS

(WHT)

(RED)

LED4 LED3 LED2 LED1

CN42

(WHT)

1

TH21TH23 TH22

CN20

INTAKE

(RED)

MF

12

CN2M

1

CN35-P

MICON
BOARD

5

1

M-NET

3

CN53-P

MICON
BOARD

(BLU)

LED5

21

3

TB5

S(SHIELD)

T O OUTDOOR UNIT

{

M2

BC CONTROLLER

M1

REMOTE CONTROLLER

DC24-30V

BLU

BLU

WHT

BLK

RED

6

14

F AN1
(GRN)

F.C

AC220-240V

AC18.4V

CND

(RED)

C1

ZNR

BLU

FUSE
250V

6.3A

T

RED

1

BLU

2

GRN/YEL

T O NEXT
INDOOR UNIT

TB2

L
N

BREAKER
(15A)

POWER SUPPLY

~/N 220-240VAC 50Hz

PULL
BOX

FUSE
(15A)

P.B

10

7

REFRIGERANT SYSTEM DIAGRAM

Strainer
(#100mesh)

Strainer
(#50mesh)

Heat exchanger

Room temperature thermistor
TH21

Gas pipe thermistor
TH23

Liquid pipe thermistor
TH22

Gas pipe

Flare

Linear expansion

valve

Gas pipe

PKFY-P20VAM, PKFY-P25VAM

{12.7 <1/2F>

Liquid pipe

{6.35 <1/4F>

Models

Item

Refrigeration pipe size (Flare connection size)

PKFY-P20VAM,PKFY-P25VAM

11

8

TROUBLESHOOTING

6-1. How to check PKFY-P20VAM,PKFY-P25VAM

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

Vane motor

Fan motor

Linear expansion
valve

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

Part Name Check points

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

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

(Refer to the thermistor)

Normal Abnormal

White-Black

195'

Open or short

Red-Black

Normal

Abnormal

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

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.

200'

Normal

(1)-(5)

White-Red

150' ±10%

Abnormal

Open or short

(2)-(6)

Yellow-

Brown

(3)-(5)

Orange-Red

(4)-(6)

Blue-Brown

Normal

1-2

Red-Pink

400' ±7%

Abnormal

Open or short

1-3

Red-Blue

1-4

Red-Orange

1-5

Red-Yellow

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

brown wire (GND) while the power is on.

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

Normal

4.3k'~9.6k'

Abnormal

Open or short

3

Blue

Yellow

5
1

Red

Connect pin No.

Brown

Gray Yellow

32 1

Orange

4 2

White

Red

Black

CN33

Pink

FAN1

1
4

6

LEV

White
Yel low

Orange
Blue

Red
Brown

CN60

1
2
3
4
5
6

12

<Thermistor Characteristic graph>

Room temperature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe thermistor(TH23)
Drain sensor(THD)

Thermistor R

0=15k' ±3%

Fixed number of B=3480k' ±2%

Rt=15exp { 3480( ) }

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

Thermistor for
lower 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 expasion valve>

1

273+t

1

273

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.

< Thermistor for lower temperature >

50

40

30

Resistance (K")

20

10

0

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

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)

6

5

4

3

2

1

Drive circuit

[4

[3

[2

[1

13

Output

(Phase)

Output

{1

1

ON

{2

ON

{3

OFF

{4

OFF

2

OFF

ON
ON

OFF

3
OFF
OFF

ON
ON

4

ON
OFF
OFF

ON

<Output pulse signal and the valve operation>

➁

Linear expansion valve operation

➂

Trouble shooting

D

A

E

B

C

Open

Extra tightning (80~100pulse)

Pulse number

2000 pulse
Opening a valve
all the way

Close

Valve position (capacity)

Symptom

Check points

Operation circuit
failure of the micro
processor.

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

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.

Countermeasures

Exchange the indoor
controller board at drive
circuit failure.

Linear expansion
valve mechanism is
locked.

Valve doesn't close
completely
(thermistor leaking).

Wrong connection of
the connector or
contact failure.

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

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 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.

Thermistor

Linear
expansion
valve

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.

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

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.

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%.

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

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 expasion 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 closeing 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

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

LED1k'

6
5
4
3
2
1

14

6-2. FUNCTION OF DIPSWITCH
PKFY-P20VAM, PKFY-P25VAM

1
2
3
4
5
6
7
8
9

10

1~4

1
2
3
4
5
6
7
8
9

10

Thermistor<Intake temperature>
position

ON OFF

Filter crogging Provide Not provide

Filter sign indication 2,500hr 100hr

Air intake Not effective Not effective

Remote indication switching Thermostat ON signal indication Fan output indication

Humidifier control

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

Auto reset function Effective Not effective

Power ON/OFF Effective Not effective

Heat pump/Cool only Cooling only Heat pump

Capacity save Available Not available

Vane Available Not available

Not available Available

Vane holizontal angle First setting First setting

Vane cooling limit angle setting (Note 1)

Down A,B,C Down A,B,C

Effective Not effective

Heater 4deg up Not effective Effective

Target Superheat setting temperature

9deg 6deg

Target Sybcool setting temperature

15deg 10deg

ON

OFF

12345678910

ON

OFF

12345678910

ON

OFF

1234

ON

OFF

1234

PKFY-P20VAM

MODEL SW2

PKFY-P25VAM

Address board

<At delivery>

Indoor controller board

Indoor controller board

<At delivery>

SW3
Function
selection

SW2
Capacity

code

switch

SW1

Mode

selection

Switch Pole

Function

Operation by switch

Remarks

Built-in remote controller

Indoor unit

Indoor linear expansion
valve opening

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

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

Set while the unit is off.

<At delivery>

Set for each capacity.

Set while the unit is off.

(Note 1) At cooling mode, each

angle can be used only 1
hour.

Reading change of LEV opening
on reversion of after defrosting

Air flow at heat
thermostat OFF

15

Address board

Address board

Operation by switchSwitch Remarks

<At delivery>

<At delivery>

SW11
1st digit
address

setting

SW12
2st digit
address

setting

Rotary switch

SW14

Connector

No.

Setting

SW5

Voltage

selection

Rotary switch

Address setting should be done when network
remote controller (PAR-F25MA) is being used.

This is the switch to be used when the indoor
unit is operated with R2, R3 series outdoor
unit as a set.

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.

Address can be set while the
unit is stopped.

Address board

2

220V

240V

<At delivery>

220V

240V

SW12

0

9

8

7

6

5

10

1

2

3

4

SW14

0

F

E

D

C

B

A

8

9

SW11

8

1

2

3

4

5

6

7

0

1

9

7

6

5

2

3

4

1

SW12

SW11

0

9

8

7

6

0

1

5

1

9

2

8

3

7

4

6

5

2

3

4

SW14

0

1

2

F

3

E

4

D

5

C

6

B

7

A

8

9

16

9

DISASSEMBLY PROCEDURE

OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS

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.

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.

PKFY-P25VAM

Be careful on removing heavy parts.

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

adjusment 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.

Push

4

13

2

Photo 1

Figure 3

Front panel

Set screws

Airflow adjustment plate

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, CN51, CN3, CN29, CN21

● CN42, CN41, CN20

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

disconnect the rest of connectors.

● CN-53-M, CN35-M (See the photo 3)

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

board.

● FAN1, CN-53-P, CN35-P

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

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

Photo 2

Electrical parts box cover

Screw caps

Electrical parts box

Photo 3

Indoor micro controller board

Indoor power
board

Indoor power
board

4. REMOVING THE ELECTRICAL PARTS BOX

(1) Remove the front panel (Refer to 2)
(2) Remove the electrical parts box cover.
(3) Pull the nozzle assemble toward you as opening the catch

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

troller board. (See the photo 4)

● CN60, CN5V, CN33, CN29, CN21, CN20
(6) Remove the connector FAN1 on the indoor power board.
(7) Disconnect the ground wire.
(8) Pull the disconnected lead wire out from the electrical parts

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

fixture (upper)

Indoor power
board

fixture (lower)

Ground wire set screw

Electrical parts box

Electrical parts box

18

OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS

5. REMOVING THE NOZZLE ASSEMBLE

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

Heat exchanger

Electrical parts box

fixture

Drain hose

6. REMOVING THE LINEFLOW FAN AND THE FAN MOTOR

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

ture catch (See the photo 6).

(5) Remove the left side of the motor fixture.
(6) Loosen the screw that 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 lineflow fan.

Photo 6

Heat exchanger

Fan motor

Photo 7

Heat exchanger

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.

Photo 8

Heat exchanger

Vane motor

Nozzle assemble

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 (N29) (CN21) on the indoor micro

controller board.

Photo 9

Heat exchanger

Drain hose

fixture set screw

set screws

Drain hose

Nozzle assemble

fixture (left)

Nozzle assemble

fixture

Line flow fan

Heat exchanger
fixture (left)

Vane motor connect screw

Liquid pipe
thermistor

Gas pipe thermistor

Electrical parts box

fixture (right)

19

PARTS LIST

10

PANEL PARTS
PKFY-P20VAM
PKFY-P25VAM

1
2
3
4
5
6
7
8
9

10

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

No.

Parts No. Parts Name Specifications

PKFY-P20VAM
PKFY-P25VAM

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Unit

Amount

Q'ty / set Price

1

1

1

1

1

1

1

1

1

1

(DT25C174H03)

3PCS/SET

(BC79R798H02)

R01 22A 651
R01 22A 691

—
R01 22A 500
R01 22A 635
T7W A00 658
R01 22A 808
R01 22A 096
R01 22A 054

—

20

ELECTRICAL PARTS
PKFY-P20VAM,PKFY-P25VAM

1
2
3
4
5
6
7
8
9

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

NOZZLE
AUTO VANE
DRAIN HOSE
FAN MOTOR
RUBBER MOUNT
BEARING MOUNT
SLEEVE BEARING
I

NDOOR CONTROLLER BOARD
POWER BOARD
ELECTRICAL BOX
ELECTRICAL BOX
TERMINAL BLOCK
TERMINAL BLOCK
ROOM TEMPERATURE THERMISTOR
LIQUID PIPE THERMISTOR
VANE MOTOR
LINEFLOW FAN
FUSE
ADDRESS BOARD
MOTOR BAND
GAS PIPE THERMISTOR
REMOTE CONTROLLER
COARD REMOCON
CONTROLLER COVER
FAN GUARD

RC4V17-AA

2P (

M1, M2

)

3P (

L, N, ;

)

250V 6.3A

PAR-F25MA
10m

No.

Parts No. Parts Name

Specifications

PKFY­P25VAM

PKFY­P20VAM

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit Amount

Q'ty / set Price

MF

M.B

P.B

TB2

TB5
TH21
TH22

MV

FUSE

A.B

TH23

R.B

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

1

1

1

1

1

1

1

1

1

1

1

1

(BG00N801B33)
(BG00N801B34)

(BG00G828G04)

R01 22A 530
R01 22A 002
R01 22A 527
T7W A00 762
R01 22A 105
R01 22A 102
R01 005 103
R01 99W 310
T7W B02 313

—

—
T7W A10 716
T7W A11 716
R01 93W 202
R01 22A 202
R01 22A 223
R01 22A 114
T7W 520 239
T7W B01 294
R01 22A 126
R01 99W 202
T7W B00 713
T7W A00 305

—
T7W B00 675

10

FILTER

CHECK MODE

TEST RUN

22

21

20

1

24

21

HEAT EXCHANGER PARTS
PKFY-P20VAM
PKFY-P25VAM

1

1
1

1
1
1

1

2
3

HEAT EXCHANGER
HEAT EXCHANGER
CONNECT PIPE

LINEAR EXPANSION VALVE

No.

Parts No. Parts Name Specifications

PKFY­P20VAM

PKFY­P25VAM

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit

Amount

Q'ty / set Price

LEV

R01 99W 480
R01 00Y 480
R01 99W 470
R01 22A 401

cCopyright 1998 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Issued in Jun. 1998. No. OC163 564
Printed in Japan

HEAD OFFICE MISTUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO

New publication, effective Jun. 1998
Specifications subject to change without notice