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

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

July 2006

No. OC309

REVISED EDITION-A

Series PKFY

Indoor unit
[Model names] [Service Ref.]

PKFY-P20VAM-E PKFY-P20VAM-E
PKFY-P25VAM-E PKFY-P25VAM-E

Wall Mounted

R410A

CONTENTS

R407C

R22

Revision:

•

RoHS PARTS LIST

• Some descriptions have
been modified.

• Please void OC309.

Note:

• This manual describes only
service data of the indoor
units.

• RoHS compliant products
have <G> mark on the spec
name plate.

• For servicing of RoHS com­pliant products, refer to the
RoHS Parts List.

is added.

INDOOR UNIT

1. SAFETY PRECAUTION ·····················2

2. PART NAMES AND FUNCTIONS······6

3. SPECIFICATION·································8

4. OUTLINES AND DIMENSIONS········10

5. WIRING DIAGRAM···························11

6. REFRIGERANT SYSTEM DIAGRAM···12

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

8. DISASSEMBLY PROCEDURE ·········19

9. PARTS LIST······································22

10. RoHS PARTS LIST ···························25

1

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.

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

If large amount of mineral oil enter, that can cause
deterioration of refrigerant oil etc.

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.

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.

Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

Gravimeter

Unit

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R407C

[1] Cautions for 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.

[2] 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.

2

[3] 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.

3

Cautions for units utilizing refrigerant R410A

Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)

Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.

Charge refrigerant from liquid phase of gas
cylinder.

If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.

Do not use refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige­rant can cause deterioration of refrigerant oil etc.

Use a vacuum pump with a reverse flow check
valve.

Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.

Use the following tools specifically designed for
use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

Keep the tools with care.

If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera­nt will change and the efficiency will be lowered.

Flare tool

Electronic refrigerant
charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

If large amount of mineral oil enter, that can cause deterio­ration of refrigerant oil etc.

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.

Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

4

[1] Cautions for service

Gravimeter

Unit

(1) Perform service after collecting the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.

Be sure to use a filter drier for new refrigerant.

[2] Additional refrigerant charge

When charging directly from cylinder

· Check that cylinder for R410A on the market is syphon type.

· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

No. Specifications

1 Gauge manifold ·Only for R410A

·Use the existing fitting

·Use high-tension side pressure of 5.3MPa·G or over.

2 Charge hose ·Only for R410A

·Use pressure performance of 5.09MPa·G or over.

3 Electronic scale
4 Gas leak detector ·Use the detector for R134a, R407C or R410A.
5 Adaptor for reverse flow check ·Attach on vacuum pump.
6 Refrigerant charge base
7 Refrigerant cylinder ·Only for R410A Top of cylinder (Pink)

8 Refrigerant recovery equipment

specifications

Cylinder with syphon

. (UNF1/2)

5

2

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Set Temperature buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
door.

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To preceding operation
number.

Ventilation button
(

Operation button)

To next operation number.

PART NAMES AND FUNCTIONS

● Indoor Unit
PKFY-P20VAM-E

PKFY-P25VAM-E

Filter

Air intake grille

Air intake

Auto Vane

Guide vane

Air Outlet

● Wired remote controller

On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

● Operation buttons

6

● Display

For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.

˚F˚C

˚F˚C

ERROR CODE

AFTER

TIMER

TIME SUN MON TUE WED THU FRI SAT

ON
OFF

Hr
AFTER

FILTER

FUNCTION

ONLY1Hr.

WEEKLY

SIMPLE

AUTO OFF

Identifies the current operation

Shows the operating mode, etc.
* Multilanguage display is sup-

ported.

“Centrally Controlled” indicator

Indicates that operation of the re­mote controller has been prohib­ited by a master controller.

“Timer Is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, shows the time
remaining.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

Comes on when it is time to clean the
filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di­rection also changes.

Room Temperature display

Shows the room temperature.

Louver display

Indicates the action of the swing
louver. Does not appear if the
louver is stationary.

(Power On indicator)

Indicates that the power is on.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

Caution

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

● If you press a button for a feature that is not installed at the indoor unit, the remote controller will display the “Not Available”

message.
If you are using the remote controller to drive multiple indoor units, this message will appear only if he feature is not
present at the parent unit.

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

7

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-E

2.2

2.5

PKFY-P25VAM-E

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 (JIS B 8615-1)

Cooling :Indoor D.B. 27°C W.B. 19°C
Heating : Indoor D.B. 20°C

ww

2. Air flow and the noise level are indicated as High – Middium1 – Middium2 – Low.

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

8

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:/5.4k", 30:/4.3k", 40:/3.0k"

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

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

250V 6.3A

4-Pole Output 17W / PS4V17

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-E PKFY-P25VAM-E

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)

9

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

R

1

5

R15

R12

R

8

R8

R

8

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-E
PKFY-P25VAM-E

Unit : mm

10

WIRING DIAGRAM5

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:220-240V)
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

M1 M2

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-E
PKFY-P25VAM-E

11

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

Parts name Check points

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

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

Vane motor

Linear expansion
valve

Refer to the next page for the details.

Room temperature

thermistor (TH21)

Liquid pipe temperature

thermistor (TH22)

Gas

pipe temperature

thermistor (TH23)

Normal

4.3k"~9.6k"

Abnormal

Open or short

Normal

150" ±10%

Abnormal

(1)-(5)

White-Red

(2)-(6)

Yellow-Brown

(3)-(5)

Orange-Red

(4)-(6)

Blue-Brown

Open or short

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

Normal Normal

200" ±7%

Abnormal

1-2

Red-Pink

1-3

Red-Blue

1-4

Red-Orange

1-5

Red-Yellow

Open or short

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

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

brown wire (GND) while the power is on.

Fan motor

Abnormal

Open or short

White-Black

Red-Black

Normal

195"
200"

Abnormal

Normal

(1) At first, check if the electrical pressure is 12V between the brown wire (GND)

and yellow wire (VCC).

(2) 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.

Blue

Yellow
Red

Orange

Pink

3

5
1

4 2

Connect pin No.

M

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

REFRIGERANT SYSTEM DIAGRAM

PKFY-P20VAM-E
PKFY-P25VAM-E

7

Item

Models

Gas pipe

Liquid pipe

TROUBLESHOOTING

PKFY-P20VAM-E PKFY-P25VAM-E

{12.7 (1/2”)
{6.35 (1/4”)

7-1. HOW TO CHECK
PKFY-P20VAM-E PKFY-P25VAM-E

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: 5.4k'
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-E PKFY-P25VAM-E

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 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-E

PKFY-P25VAM-E

Built-in remote controller

w2

Fan operation at Heating mode Heat thermostat ON is operating

Low Extra low
Setting air flow Reset to SW1-7

ON

OFF

1234

ON

OFF

1234

Indoor unit

w1
w1

Address board

<At delivery>

ON

OFF

12345678910

NOTE:

w1 SW1-7=OFF, SW1-8=ON

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

w2 It is impossible to intake

w1

the fresh air.

Indoor controller board

Set while the unit is off.

<At delivery>

Set for each capacity.

Remarks

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

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

w1

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

9

8

7

6

5

10

1

2

3

4

SW14

0

F

E

D

C

B

A

9

SW11

1

2

3

4

5

6

7

8

Address board

Address can be set while the

unit is stopped.

0

1

9

8

7

6

5

Address setting should be done when M-NET

2

remote controller is being used.

3

4

1

<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

7-3. TEST POINT DIAGRAM

7-3-1. Indoor controller board
PKFY-P20VAM-E
PKFY-P25VAM-E

CN6V
Vane moter output
(MV)

CN60
Linear expansion valve
output (LEV)

CN51
Centrally control

CN52
Remote indication

CN41
Connector
(HA terminal-A)

CN32
Connector
(Remote switch)

CN34
Fan motor rotational
frequency input (MF)

CN29
Pipe temperature
thermistor/Gas (TH23)

CN21
Pipe temperature
thermistor/Liquid (TH22)

CN3A
Connect to the
MA-Remote controller

11

Between

(Pin11(+))

CN20
Room temperature
thermistor (TH21)

to 338.7-13V DC

SW3
Mode selection

SW2
Capacity setting

CN53M
Connect to the indoor power board (CN53P)

11

Between
Between
Between

to 2224-30V DC (non-polat)

33

to 5512.5-13.7V DC (Pin33(+))

44

to 5511.5-12.7V DC (Pin44(+))

LED2
Power supply for
MA-Remote controller

CN35M
Connect to the indoor
power board (CN35P)

17

7-3-2. Indoor power board
PKFY-P20VAM-E
PKFY-P25VAM-E

CN2M
Connect to the terminal block (TB5)
(M-NET transmission connecting wire)
24-30V DC (non-polar)

CN35P
Connect to the indoor controller board
(CN35M)

CN53P
Connect to the indoor controller board
(CN53M)

11

Between
Between
Between

to 2224-30V DC (non-polat)

33

to 5512.5-13.7V DC (Pin33(+))

44

to 5511.5-12.7V DC (Pin44(+))

FAN
Fan motor output (MF)

CND
Power supply for
indoor controller board

11

Between

to 33220-240V AC

FUSE

6.3A 250V

LED1
Main power supply
(Indoor unit : 220-240V)

18

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-P20VAM-E PKFY-P25VAM-E

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.

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

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

19

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

20

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.

21

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-E
PKFY-P25VAM-E

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

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 (non-RoHS compliant)

PANEL PARTS
PKFY-P20VAM-E
PKFY-P25VAM-E

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

22

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

2P (M

1, M2

)

3P (

L, N, ;

)

GAS
LIQUID
PS4V17-KA

PAR-21MAA

No.

Parts No. Parts Name

Specifications

PKFY­P25VAM-E

PKFY­P20VAM-E

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit Amount

Q'ty / set Price

MV

FUSE

TH21

A.B

TB5
TB2

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

(BG00J285G24)

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 H17 310
R01 22A 105
R01 E38 202
T7W E06 202
T7W E11 762
R01 22A 114
R01 005 103
R01 22A 102

—

ON/OFF

TEMP.

PKFY-P20VAM-E PKFY-P25VAM-E

23 22 21 17 20 1719 18 141516

24

1

2

12

13

3

4

58 109 11

6 7

23

HEAT EXCHANGER PARTS

1

2
3

HEAT EXCHANGER
HEAT EXCHANGER
CONNECT PIPE
LINEAR EXPANSION VALVE

No.

Parts No. Parts Name Specifications

PKFY­P20VAM-E

PKFY­P25VAM-E

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Unit

Amount

Q'ty / set Price

R01 H58 480
R01 H59 480
R01 E03 470
R01 E63 401

1

1
1

1
1
1 LEV

PKFY-P20VAM-E
PKFY-P25VAM-E

1

3

2

24

10

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.

G
G
G
G
G
G
G
G
G
G

RoHS

Parts No. Parts Name Specifications

PKFY-P20VAM-E
PKFY-P25VAM-E

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 23A 635
R01 23A 651
R01 23A 500
R01 23A 691
R01 23A 096

—
R01 23A 054
T7W A01 658
R01 23A 808

—

RoHS PARTS LIST

PANEL PARTS
PKFY-P20VAM-E
PKFY-P25VAM-E

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

25

ELECTRICAL PARTS

RoHS

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

2P (M

1, M2

)

3P (

L, N, ;

)

GAS
LIQUID
PS4V17-KA

PAR-21MAA

No.

G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G

Parts No. Parts Name

Specifications

PKFY­P25VAM-E

PKFY­P20VAM-E

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit Amount

Q'ty / set Price

MV

FUSE

TH21

A.B

TB5
TB2

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

(BG00J285G24)

T7W 23A 675
R01 23A 530
R01 23A 223
R01 23A 002
R01 23A 527
R01 23A 126
R01 08Y 092
R01 E06 239
R01

H06 202
T7W E01 294
T7W E04 304
T7W E33 716
T7W E34 716

—
T7W E28 313
R01 H94 310
R01 23A 105
R01 H14 202
R01 H05 202
T7W 23A 762
R01 23A 114
R01 E04 103
R01 23A 102

—

ON/OFF

TEMP.

PKFY-P20VAM-E PKFY-P25VAM-E

23 22 21 17 20 1719 18 141516

24

1

2

12

13

3

4

58 109 11

6 7

26

HEAT EXCHANGER PARTS

1

2
3

HEAT EXCHANGER
HEAT EXCHANGER
CONNECT PIPE
LINEAR EXPANSION VALVE

No.

G
G
G
G

RoHS

Parts No. Parts Name

Specifications

PKFY­P20VAM-E

PKFY­P25VAM-E

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Unit

Amount

Q'ty / set Price

R01 J37 480
R01 J38 480
R01 E04 470
R01 H05 401

1

1
1

1
1
1 LEV

PKFY-P20VAM-E
PKFY-P25VAM-E

1

3

2

27

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN

cCopyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Jul. 2006 No. OC309 REVISED EDITION-A PDF 8
Distributed in Apr. 2004 No. OC309 PDF 9
Made in Japan

New publication, effective Jul. 2006
Specifications subject to change without notice