Mitsubishi PLFY-P20VCM-E2.TH, PLFY-P25VCM-E2.TH, PLFY-P32VCM-E2.TH, PLFY-P40VCM-E2.TH Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

May 2009

No.OCH463

Indoor unit
[Model names] [Service Ref.]

PLFY-P20VCM-E2

PLFY-P20VCM-E2.TH

PLFY-P25VCM-E2

PLFY-P25VCM-E2.TH

PLFY-P32VCM-E2

PLFY-P32VCM-E2.TH

PLFY-P40VCM-E2

PLFY-P40VCM-E2.TH

R410A

R407C

Note :

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

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

CONTENTS

1. SAFETY PRECAUTION

2. PART NAMES AND FUNCTIONS

3. SPECIFICATIONS

4. 4-WAY AIR FLOW SYSTEM

5. OUTLINES AND DIMENSIONS

6. WIRING DIAGRAM

7.

REFRIGERANT SYSTEM DIAGRAM

8. TROUBLESHOOTING

9. DISASSEMBLY PROCEDURE

..........................

...................................

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...............................

..........................

R22

..........

............

......

.............

2
6

9
11
13
14
15

16
23

Model name
indication

INDOOR UNIT

PARTS CATALOG (OCB463)

1

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R407C

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 indoors during
installation and 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.

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

Use liquid refrigerant to charge 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.

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

[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

[2] Refrigerant recharging

(1) Refrigerant recharging process

1Direct charging from the cylinder

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

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

Unit

Gravimeter

(2) Recharge in refrigerant leakage case

·After recovering all the 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.

[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

33

Cautions for units utilizing refrigerant R410A

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

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

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

If large amount of mineral oil enters, that 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.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Handle tools with care.

If dirt, dust or moisture enters 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.

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.

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

(1) Perform service after recovering 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 standing vertically. (Refrigerant is charged from liquid phase.)

Unit

Gravimeter

[3] Service tools

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

No. Tool name 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 Adapter for reverse flow check · Attach on vacuum pump.

6 Refrigerant charge base

7 Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

8 Refrigerant recovery equipment

specifications

. (UNF1/2)

5

2

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Temperature setting 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
lid

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 return operation
number

Ventilation button
( Operation button)

To go to next operation
number

Built-in temperature sensor

PART NAMES AND FUNCTIONS

Indoor Unit

Horizontal Air Outlet
Sets horizontal airflow automatically

during cooling or dehumidifying.

Filter
Remove dust and pollutants

from inhaled air.

Grille

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Air Intake
Inhales air from room.

Wired remote controller

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

6

Wired remote controller

Display Section

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

Identifies the current operation

Shows the operating mode, etc.
*Multilanguage display is available.

“Centrally Controlled” indicator

Indicates that operation from 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, the time to be
switched off is shown.

TIME SUN MON TUE WED THU FRI SAT
TIMER

AFTER

ERROR CODE

°F°C

Hr

AFTER

°F°C

ONLY1Hr.

Up/Down Air Direction indica­tor

Shows the direction of the
outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
when the airflow direction also
changes.

Room Temperature display

Shows the room temperature. The room
temperature display range is 8~39.
The display blinks if the temperature
is less than

Louver display

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

(Power On indicator)

Indicates that the power is on.

ON

OFF

FUNCTION

FILTER

WEEKLY

AUTO OFF

8 or 39

SIMPLE

or more.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

To be displayed on when it is time to
clean the filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

Note:

“PLEASE WAIT” message

●

This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
“NOT AVAILABLE” message

●

This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.

77

Wireless remote controller

CHECK

TEST RUN

display

CHECK and TEST RUN display indicate that
the unit is being checked or test-run.

MODEL SELECT

Blinks when model is selected.

display

display

Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

display

SET TEMP. display indicates the set desired
temperature.

display

OPERATION MODE display
Operation mode display indicates which
operation mode is in effect.

display

The vertical direction of air flow is indicated.

display

FAN SPEED display indicates which fan
speed has been selected.

ON/OFF button

The unit is turned ON and OFF alternately
each time the button is pressed.

FAN SPEED SELECT button

Used to change the fan speed.

MODE SELECT button

Used to switch the operation mode between
cooling, drying, fan, heating and auto mode.

In case the outdoor unit is cool only type,
the heating and auto mode are not
available.

CHECK-TEST RUN button

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

VANE CONTROL button

Used to change the air flow

CHECK

TEST RUN

MODEL SELECT

NOT AVAILABLE

ON/OFF TEMP

FAN

MODE

CHECK

VAN E

LOUVER

TEST RUN

RESETSET CLOCK

°C

AMPM

AMPM

AUTO STOP

AUTO START

h

min

CLOCK display

Displays the current time.

TIMER display

Displays when in timer operation or when
setting timer.

“ ” “ ” display

Displays the order of timer operation.

“ ” “ ” display

Displays whether timer is on or off.

button

SET TEMPERATURE button sets any desired
room temperature.

TIMER CONTROL buttons

AUTO STOP (OFF timer): when this switch is
set, the air conditioner will be automatically
stopped at the preset time.
AUTO START (ON timer): when this switch is
set, the air conditioner will be automatically
started at the preset time.

h and min buttons

Buttons used to set the “hour and minute” of
the current time and timer settings.

LOUVER button

Changes left/right airflow direction.

(Not available for this model.)

CLOCK button

RESET button

SET button

8

3

SPECIFICATIONS

3-1. SPECIFICATIONS

Model

Power source
Cooling capacity
(Nominal)

Power input
Current input

Heating capacity
(Nominal )

Power input
Current input

External finish
External dimension H x W x D

Net weight
Decoration panel

Model
External finish
Dimension
H × W × D
Net Weight
Cord heater

Heat exchanger
FAN

Type × Quantity
External static press.
Motor type
Motor output
Driving mechanism
Airflow rate

(Low-Mid-High)

Noise level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Protection device
Refrigerant control device
Connectable outdoor unit
Diameter of
refrigerant pipe

Liquid
Gas

Field drain pipe size

Standard
attachment
Remark

Document
Accessory

Optional parts

1

1

1

2

3

3

3

kW
kcal / h
Btu / h
kcal / h
kW
A
kW
kcal / h
Btu / h
kW
A

mm
in.
kg (lb)

mm
in.
kg (lb)
kW

kW

3

m

/ min
L / s
cfm
dB <A>

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

PLFY-P20VCM-E2

2.2
1,900
7,500
2,000

0.05

0.23

2.5
2,200
8,500

0.05

0.23

208 × 570 × 570

8-1/4" × 22-1/2" × 22-1/2"

15.5 (35)

SLP-2AAW or SLP-2ALW

20 × 650 × 650

13/16" × 25-5/8" × 25-5/8"

3 (7)

0.015

0Pa (0mmH

2O)

0.011

8-9-10
133-150-167
283-318-353

28-31-35

ø6.35 (ø1/4") Flare
ø12.7 (ø1/2") Flare

PLFY-P25VCM-E2

PLFY-P32VCM-E2

PLFY-P40VCM-E2

Single phase 220-230-240V 50Hz

2.8
2,400
9,600
2,500

0.05

0.23

3.2
2,800

10,900

0.05

0.23

3.6

3,100

12,300

3,150

0.06

0.28

4.0

3,400

13,600

0.06

0.28

4.5

3,900

15,400

4,000

0.06

0.28

5.0

4,300

17,100

0.06

0.28

Unit: Galvanized sheets with grey heat insulation

208 × 570 × 570

8-1/4" × 22-1/2" × 22-1/2"

15.5 (35)

208 × 570 × 570

8-1/4" × 22-1/2" × 22-1/2"

17 (38)

208 × 570 × 570

8-1/4" × 22-1/2" × 22-1/2"

17 (38)

SLP-2AAW or SLP-2ALW SLP-2AAW or SLP-2ALW SLP-2AAW or SLP-2ALW

White Munsell(6.4Y 8.9/0.4)

20 × 650 × 650

13/16" × 25-5/8" × 25-5/8"

3 (7)

0.015

20 × 650 × 650

13/16" × 25-5/8" × 25-5/8"

3 (7)

0.015

20 × 650 × 650

13/16" × 25-5/8" × 25-5/8"

3 (7)

0.015

Cross fin (Aluminum fin and copper tube)

Turbo fan × 1

0Pa (0mmH

2O)

0Pa (0mmH

2O)

0Pa (0mmH

2O)

Single phase induction motor

0.015

0.02

0.02

Direct-driven by motor

8-9-10
133-150-167
283-318-353

29-31-37

8-9-11
133-150-183
283-318-388

29-33-38

8-9-11
133-150-183
283-318-388

30-34-39

Polyethylene foam

PP honeycomb fabric (long life type)

Fuse

LEV

R410A, R407C, R22 CITY MULTI
ø6.35 (ø1/4") Flare
ø12.7 (ø1/2") Flare

ø6.35 (ø1/4") Flare
ø12.7 (ø1/2") Flare

ø6.35 (ø1/4") Flare
ø12.7 (ø1/2") Flare

O.D. 32mm (1-1/4") (PVC pipe VP-25 connectable)

Installation manual, Instruction book

Drain hose I.D. 32mm (1-1/4"), Wireless junction cable

Decoration panel : SLP-2AAW or SLP-2ALW
*PLFY-P-VCM-E2 should use together with Decoration panel.

Installation

Note :

Outdoor :

Pipe length :

Level difference :

* Nominal conditions 1, 3 are subject to JIS B8615-1.
* Due to continuing improvement, above specification may be subject to change without notice.

1 Nominal cooling condition

Indoor :

27˚CDB/19˚CWB (81˚FDB/66˚FWB)
35˚CDB (95˚FDB)

7.5 m (24-9/16 ft)
0 m (0 ft)

Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to
the Installation Manual.

2 Nominal cooling condition

27˚CDB/19.5˚CWB (81˚FDB/67˚FWB)
35˚CDB (95˚FDB)
5 m (16-3/8 ft)
0 m (0 ft)

3 Nominal heating condition

20˚CDB (68˚FDB)
7˚CDB/6˚CWB (45˚FDB/43˚FWB)

7.5 m (24-9/16 ft)
0 m (0 ft)

Unit converter

kcal = kW × 860
Btu/h = kW × 3,412

3

cfm = m
lb = kg / 0.4536

/min x 35.31

9

3-2. ELECTRICAL PARTS SPECIFICATIONS

Model

Symbol

Parts name

Thermistor
(Room temperature
detection)

Thermistor
(Pipe temperature
detection/ Liquid)

Thermistor
(Pipe temperature
detection/ Gas)

Fuse
(Indoor controller board)

TH21

TH22

TH23

FUSE

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

PLFY-P25VCM-E2.THPLFY-P20VCM-E2.TH PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

250V 6.3A

Fan motor
(with Thermal fuse)

Fan motor capacitor

Vane motor

Drain pump

Drain sensor

Linear expansion valve
[coil]

Electric heater
(Condensation proof)

Power supply terminal
block

Transmission terminal
block

MA remote controller
terminal block

MF

C

MV

DP

DS

LEV

H2

TB2

TB5

TB15

6-pole OUTPUT 11W

PK6V11-LF

Thermistor resistance 0/6k, 10/3.9k, 20/2.6k, 25/2.2k, 30/1.8k, 40/1.3k

DC12V Stepping motor drive, Port dimension :5.2 (0~2000pulse)

6-pole OUTPUT 15W

PK6V15-LD

Thermal fuse

MSBPC20M13

DC12V 300

PLD-12230ME-1

INPUT 12/10.8W 241/Hr

EDM-40YGME

(L, N, ) Rated to 330V 30A +

(M1, M2, S) Rated to 250V 20A +

(1, 2) Rated to 250V 10A +

6-pole OUTPUT 20W

OFF 145 $ 2

1.5 × 440V1.0 × 440V



/phase

240V 15W

PK6V20-LL

6-pole OUTPUT 20W

PK6V20-LM

+Note: Refer to WIRING DIAGRAM for the supplied voltage.

10

4 4-WAY AIR FLOW SYSTEM

4-1. FRESH AIR INTAKE (Location for installation)

At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required.

Fresh air intake

Detail drawing of fresh air intake

25

:100

3-:2.8 hole

Burring hole

120°

Ceiling surface

118

:73.4

Cut out hole

120°

Refrigerant pipe

Electrical Box

Drain pipe

4-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
PLFY-P20VCM-E2.TH
PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH
PLFY-P40VCM-E2.TH

Taking air into the unit

Static pressure : P [Pa]

50

0.5 1.0 1.5 2.0 2.5 3.0 3.5

0

-50

-100

-150

-200

-250

-300

NOTE: Fresh air intake amount should be 20% or less of

whole air amount to prevent dew dripping.

Air flow : Q [m

3

/min]

How to read curves

Q

Duct characteristics
at site

A

C

B

A

EC

AD

Curve in the

1

left graphs

0

2

3

Q

Qa

Q

Q…Designed amount of fresh air intake
<m
A…Static pressure loss of fresh air

intake duct system with air flow
amount Q <Pa>

B…Forced static pressure at air condi-

tioner inlet with air flow amount Q
<Pa>
C…Static pressure of booster fan with

air flow amount Q <Pa>
D…Static pressure loss increase

amount of fresh air intake duct sys-

tem for air flow amount Q <Pa>
E…Static pressure of indoor unit with

air flow amount Q <Pa>
Qa…Estimated amount of fresh air

intake without D <m3/min>

3

/min>

4-3. OPERATION IN CONJUNCTION

WITH DUCT FAN (Booster fan)

• Whenever the indoor unit operates, the duct fun also
operates.
(1)Connect the optional multiple remote controller

adapter(PAC-SA88HA-E) to the connector CN51
on the indoor controller board.

(2)Drive the relay after connecting the 12V DC relay

between the Yellow and Orange connector wires.

MB: Electromagnetic switch power relay for duct fan.

X: Auxiliary relay (For DC 12V, coil rating : 1.0W or
below)

CN51
on indoor
controller board

Indoor controller board

Multiple remote
controller adapter
PAC-SA88HA-E

1111

5

1

Connector (5P)

Indoor unit side

Be sure to secure insulation

Green

CN51

material by tape, etc.

Red

Brown

Multiple remote
controller adapter
PAC-SA88HA-E

CN51

Yellow

Orange

~

MB

Installation at site

Be sure to secure insulation
material by tape, etc.

Distance between indoor
controller board and relay
must be within 10m.

4-4. FIXING HORIZONTAL VANE

Horizontal vane of each air outlet can be fixed according to the environment where it is installed.

Setting procedure

1) Turn off a main power supply (Turn off a breaker).

2) Disconnect the vane motor connector of the direction of the arrow with pressing the unlocking button as shown in figure
below.

Insulate the disconnected connector with the plastic tape.

Vane motor

Vane motor

Connector

Horizontal vane

3) Set a vertical vane of the air outlet, which is to be fixed by the hand slowly within the range in the table below.

Measured standard posi-

tion of the grille

Horizontal vane

<Set range>

Standard of

horizontal position

Level 30°

(Min.)

Downward 45° Downward 55°

Downward 70°

(Max.)

Unlocking button

Dimension A (mm)

+ Dimension between 21 mm and 30 mm can be arbitrarily set.

Caution



Do not set the dimension out of the range.

Erroneous setting could cause dew drips, smudge on ceiling or malfunction of unit.

21 25 28 30

12

5

OUTLINES AND DIMENSIONS

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

Fresh air intake

15~37

Ceiling hole

420

576~620

Suspension bolt pitch

56

57

15~37

15~37 15~37576~620

2

1

66121

66121

66121

93

93

93

Suspension bolt lower edge

38~58

Suspension bolt pitch

17 202

Terminal block

Terminal block

Terminal block

570

352

352

352

530

335

335

335

199

199

199

Ceiling hole

230

Grille

Grille

Grille

Ceiling surface

570

335

570

335

570

335

31

31

31

87

87

87

Drain pipe

Drain pipe

Drain pipe
VP-25 connection

VP-25 connection
(O.D.:32)

Suspension bolt M10 or W3/8

208

208

208

235

235

235

193

193

193

20

20

20

+5

0

+5

+5

27

27

27

Detail drawing of fresh air intake

Detail drawing of fresh air intake

Detail drawing of fresh air intake

:100

25

25

25

3-:2.8

Burring hole

Burring hole

Burring hole

118

118

118

120



Ceiling surface

Ceiling surface

Ceiling surface

Wiring entry

18248

18248

18248

:73.4

Cut out hole

Cut out hole

Cut out hole

120

650

650

650

55 35

55 35

55 35

301

301

301

Air outlet hole

Air outlet hole

Air outlet hole

35 55

35 55

35 55

650

301

Air outlet hole

V/M

V/M

377

377

377

Air intake hole

Air intake hole

Air intake hole

Brand label

V/M

V/M

Grille

Grille

Grille

Drain hole

Drain hole

Drain hole

Auto vane

Auto vane

Auto vane

377

377

Air intake hole

Air intake grille

Vane motor

Models 

PLFY-P20VCM-E2
PLFY-P25VCM-E2
PLFY-P32VCM-E2
PLFY-P40VCM-E2

Refrigetant pipe

(6.35mm dia.)

flared connection

1/4 inch

Refrigetant pipe

(12.7mm dia.)

flared connection

1/2 inch

1313

WIRING DIAGRAM6

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

14

7 REFRIGERANT SYSTEM DIAGRAM

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

Thermistor (Pipe temperature detection/ Gas) TH23

Heat exchanger

Strainer1 (#50mesh)
Strainer2 (#100mesh)

Thermistor (Room temparature detection) TH21

Unit : mm(inch)

Gas pipe

Liquid pipe

:12.7(1/2)

:6.35(1/4)

Strainer (#50mesh)

Thermistor (Pipe
temperature
detection/ Liquid) TH22

Linear expansion valve

Strainer (#100mesh)

Gas pipe

Flare connection

Liquid pipe

15

8

TROUBLESHOOTING

8-1. HOW TO CHECK THE PARTS
PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

Parts name Check points

Thermistor (TH21)
(Room temperature
detection)
Thermistor (TH22)
(Pipe temperature
detection/ Liqid)
Thermistor (TH23)
(Pipe temperature
detection/ Gas)

Vane motor (MV)

White

M

Orange

Red

Yellow

Blue

Fan motor (MF)

P

BLK RED ORNYLW

# : Thermal fuse 145°C±2°C

BLU

BRN

WHT

Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 10~30)

Normal

4.3k~9.6k

Abnormal

Open or short

Refer to the next page for the details.

Measure the resistance between the terminals with a tester.
(At the ambient temperature 20~30)

NormalConnector Abnormal

Red — Yellow

Red — Blue

Red — Orange

300 Open or short

Red — White

Measure the resistance between the terminals with a tester.
(Coil wiring temperature 10°C ~ 30°C)

Normal

PLFY-P20VCM-E2 PLFY-P25VCM-E2 PLFY-P32VCM-E2 PLFY-P40VCM-E2

WHT-BLK

BLK-BLU

BLU-YLW

YLW-RED

RED-BRN

302~327

91~100

38~42

265~288

390~423

82~90
28~32

158~172

378~409
157~170

44~49

306~332

312~338
137~149

44~49

296~321

Abnormal

Opened or

short-circuited

Linear expansion
valve (LEV)

White

Red

Blue

Brown

M

Yellow

Orange

Drain pump (DP)

Relay
connector

Yellow

1

3

Yellow

Drain sensor (DS)

1
2
3

Disconnect the connector then measure the valve resistance with a tester.

Normal

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

Abnormal

Open or short

Refer to the next
page for the details.

200 $10%

Measure the resistance between the terminals with a tester.
(At the ambient temperature 20~30)

Normal Abnormal

290 Open or short

Measure the resistance after 3 minutes have passed since the power supply was intercepted.
(At the ambient temperature 0~60)

Normal

0.6k~6.0k

Abnormal

Open or short

Refer to the next page for the details.

16

<Thermistor characteristic graph>

Thermistor (TH21)

Thermistor for

(Room temperature detection)

lower temperature

Thermistor (TH22)
(Pipe temperature detection/ Liquid)
Thermistor (TH23)
(Pipe temperature detection/ Gas)

Thermistor R

0=15k' ± 3%

Fixed number of B=3480 ± 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
drain sensor

Thermistor R0=6.0k' ±5%
Fixed number of B=3390 ±2%

Rt=6exp { 3390( ) }

1

273+t

1

273

0: 6.0k'
10: 3.9k'
20: 2.6k'
25: 2.2k'
30: 1.8k'
40: 1.3k'
60: 0.6k'

< Thermistor for lower temperature >

50

40

30

20

Resistance (k)

10

0

-20-100 1020 304050

Temperature ()

< Thermistor for drain sensor >

10

9

8

7

6

5

4

Resistance (k)

3

2

1

0

-20 0 20 40 60 80

Temperature ()

Linear expansion valve

1 Operation summary of the linear expansion valve

• Linear expansion valves open/close through the use of a stepping motor after receiving the pulse signal from the indoor
controller board.

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

Controller board

DC12V

Linear expansion valve

4

:4

M

6

:2

2

:1

:3

5

White

1

Red

3

Orange

Blue

Brown

Yellow

Brown

Red

:4

:3

:2

:1

Blue

Orange

Yellow

White

Connector(CN60)

6

5

4

3

2

1

Drive circuit

:4

:3

:2

:1

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.

1717

<Output pulse signal and the valve operation>

Output

(Phase)

{1

{2

{3

{4

1

ON

ON

OFF

OFF

Output

2

OFF

ON

ON

OFF

2 Linear expansion valve operation

Open

Close

Valve position (capacity)

A

E

Close

B

Open

Pulse number

3

OFF

OFF

ON

ON

D

4

ON

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

The output pulse shifts in above order.

OFF

• When linear expansion valve operation stops, all output phase

OFF

ON

C

Outdoor unit R410A model : 1400 pulse
Outdoor unit R22/R407C model : 2000 pulse
Opening a valve
all the way

become OFF.

• At phase interruption or when phase does not shift in order, motor
does not rotate smoothly and motor will lock and vibrate.

• When the switch is turned on, 2200 pulse closing valve signal will be
send till it goes to point A in order to define the valve position.

• When the valve moves smoothly, there is no sound or vibration
occurring from the linear expansion valves : however, when the
pulse number moves from E to A or when the valve is locked, more
sound can be heard than in a normal situation.

• Sound can be detected by placing the ear against the screw driver
handle while putting the screw driver tip to the linear expansion
valve.

Extra tightening (200~800pulse)

3 Troubleshooting

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 does not close
completely.

Wrong connection
of the connector or
contact failure

Check points

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

When power is turned on, pulse signals will be output for 10
seconds. There must be some defects in the operation circuit
if the LED does not light while the signals are output or keeps
lighting even after the signals stop.

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

Measure the resistance between each coil (white-red, yellow­brown, orange-red, blue-brown) with a tester. It is normal if
the resistance is in the range of 200 ±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

Thermistor
(Liquid pipe)

Linear
expansion
valve

It is not necessary to exchange the linear expansion valve, if
the leakage is small and not affecting normal operation.

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
is any 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.

LED1k

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 refriger­ant is leaked, exchange
the linear expansion valve.

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

18

8-2. FUNCTION OF DIP SWITCH

Switch Function Remarks

Pole

ON OFF

Thermistor <Room temperature

Operation by switch

SW1

Function

Selection

1

detection> position

2

Filter clogging detection

3

Filter cleaning

4

Fresh air intake

5

Remote indication switching

6

Humidifier control

7

Air flow set in case of
Heat thermo OFF

8

9

Auto restart function

10

Power ON/OFF

Built-in remote controller

Provided

2,500h

Effective

Thermo ON signal indication

Fan operation at Heating mode

Low +3

Setting air flow +3

Effective

Effective

Indoor unit

Not provided

100h

Not effective

Fan output indication

Thermo ON operation at heating mode

Extra low +3

Depends on SW1-7

Not effective

Not effective

Effective

timing

Under
suspension

Indoor controller board

<Initial setting>

ON

OFF

1234 567 8 9

+

SW 1-8

SW 1-7

OFF

OFF

OFF

ON

ON

OFF

ON

ON

Indoor controller board

SW2

Capacity

code

setting

Capacity

P20 P32

1~6

P25 P40

SW 2 Capacity SW 2

ON

OFF

1234 56

ON

OFF

1234 56

ON

OFF

1234 56

ON

OFF

1234 56

Before
power
supply
ON

<Initial setting>

Set for each capacity.

10

Extra low

Low

Setting air flow

stop

SW3

Function

setting

SW4

Unit

Selection

Heat pump / Cooling only

1

Louver

2

Van e

3

Vane swing function

4

Vane horizontal angle

5

Vane cooling limit angle setting +4

6

Indoor linear expansion

7

valve opening

Heat 4degrees up

8

Superheat setting temperature

9

Sub cool setting temperature

10

Cooling only

Available

Available

Available

Second setting

Horizontal angle

Effective

Not effective

+5

+5

+6

—

—

Heat pump

Not available

Not available

Not available

First setting

Down A, B, C

Not effective

Effective

In case of replacing the indoor controller board, make sure to set the switch to
the initial setting, which is shown below.

1~5

ON

OFF

12345

Indoor controller board

Set while the unit is off.

<Initial setting>

ON

OFF

1234 567 8 9

Under
suspension

—

Note :

+4

At cooling mode, each angle

can be used only 1 hour.

+5 Do not use SW3-9, 10 as

trouble might be caused by
the usage condition.

+6 Second setting is same as
first setting.

10

—

Indoor controller board

Before
power
supply
ON

19

Pole Operation by switch

Effective

timing

Remarks

SW11

1s digit

address

setting

SW12

10ths digit

address

setting

SW14

Connection

No.

setting

J41, J42

Wireless

remote

controller

Pair No.

SW1210SW11

0

9

8

7

6

5

Rotary switchRotary switch

1

0

1

9

2

3

4

2

8

7

6

5

Address setting should be done when M-NET

3

4

remote controller is being used.

1

SW14

0

1

2

F

3

E

4

D

5

C

6

B

7

A

8

9

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

• To operate each indoor unit by each remote controller when installed 2 indoor
units or more are near, Pair No. setting is necessary.

Pair No. setting is available with the 4 patterns (Setting patterns A to D). .
Make setting for J41, J42 of indoor controller board and the Pair No. of

wireless remote controller.

• You may not set it when operating it by one remote controller.
Setting for indoor unit
Cut jumper wire J41, J42 on the indoor controller board according to the

table below.

Wireless remote controller pair number:

Setting operation

1. Press the SET button (using a pointed implement). Check that the
remote controller's display has stopped before continuing.

Jumper

MODEL SELECT flashes, and the model No. (3 digits) appears (steadily-lit).

2. Press the MINUTE button twice. The pair number appears flashing.

3. Press the temperature buttons to select the pair number to set.

4. Press the SET button (using a pointed implement).The set pair number is
displayed (steadily-lit) for 3 seconds, then disappears.

Indoor controller board

Before
power
supply
ON

Indoor controller board

Under

operation

or

suspension

SET button

<Initial setting>

SW12 SW11

0

9

8

7

6

0

1

5

1

9

2

4

2

8

3

3

7

4

6

5

<Initial setting>

SW14

0

1

2

F

3

E

4

D

5

C

6

B

7

A

8

9

<Initial setting>

Pattern A

MODEL SELECT

TEMP

ON/OFF

AUTO STOP

FAN

AUTO START

MODE

VANE

h

LOUVER

CHECK

TEST RUN

min

RESET

CLOCK

SET

Pair No.

Model No.

Temperature
button

Minute
button

Setting pattern

A

B

C

D

Indoor controller
jumper wire

J41 J42

—

Cut

—

Cut

—

—

Cut

Cut

Pair No. of wireless
remote controller

0

1

2

3

Pair No.4-9 of wireless remote controller is setting pattern D.

Initial setting

—

—

—

20

8-3. TEST POINT DIAGRAM

8-3-1. Indoor controller board

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

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

CN2D
Connect to the indoor
power board (CN2S)

12.5-13.7V DC (Pin1 (+))

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

CNDK
Connect to the indoor power

board (CNSK)

Between 1 to 3 220-240V AC

CNP
Drain pump output (DP)
Between 1 to 3 220-240V AC

FUSE

6.3A 250V

CN3A
Connect to the terminal block (TB15)
(MA-Remote controller connecting wire)
Between 1 to 3 8.7-13V DC (Pin1 (+))

LED2
Power supply for
MA-Remote controller

CN29
Pipe temperature
detection/Gas (TH23)

CN21
Pipe temperature
detection/Liquid (TH22)

CN20
Room temperature
detection (TH21)

SW11
Address setting
1s DIGIT

CN31
Drain sensor (DS)

SW12
Address setting
10ths DIGIT

SW14
Branch No.

CN60
Linear expansion valve
output (LEV)

CND
Power supply for
indoor controller board
Between 1 to 3 220-240V AC

FAN
Fan motor output (MF)

CN6V
Vane motor output (MV)

CN90
Connect to the wireless
junction cable

CN52
Remote indication

CN51
Centrally control

SW4
Model selection

SW3
Function setting

SW1
Model selection

SW2
Capacity setting

Jumper wire J41, J42
Pair No. setting for
wireless remote controller

CN27
Connector
(Damper)

21

CN32
Connector
(Remote switch)

CN25
Connecter(Humidifier)

8-3-2. Indoor power board

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

CN2S
Connect to the indoor controller board (CN2D)
Between 1 to 3 12.5-13.7V DC (Pin1 (+))

CNSK
Connect to the indoor controller board (CNDK)
Between 1 to 3 220-240V AC

22

DISASSEMBLY PROCEDURE9

PLFY-P20VCM-E2.TH PLFY-P25VCM-E2.TH
PLFY-P32VCM-E2.TH PLFY-P40VCM-E2.TH

OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS

1. Removing the air intake grille

(1) Slide the knob of air intake grille to the direction of the

arrow 1 to open the air intake grille.

(2) Remove the string hook from the panel to prevent the grille

from dropping.

(3) Slide the hinge of the intake grille to the direction of the

arrow 2 and remove the air intake grille.

2. Removing the fan guard

(1) Open the air intake grille.
(2) Remove the 3 screws of fan guard.

Be careful when removing heavy parts.

Figure 1

Air intake grille

Grille

Air intake grille knob

Photo 1

Fan guard

Screws

3. Removing the panel
(1) Remove the air intake grille. (Refer to 1)
Corner panel (See figure 2)

(1) Remove the screw of the corner.
(2) Slide the corner panel to the direction of the arrow 3, and

remove the corner panel.

Panel (See photo 2)

(1) Disconnect the connector that connects with the unit.
(2) Remove the 2 screws from the panel and loose other 2

screws fixed to the oval hole, have different diameter.

(3) Rotate the panel a little to remove the screws.(Slide the

panel so that the screw comes to a larger diameter of the
oval hole, which has 2 different diameters.)

4. Removing the electrical parts

(1) Remove the 2 screws and the control box cover.

<Electrical parts in the control box>

• Indoor controller board (I.B)

• Indoor power board (P.B)

• Fan motor capacitor (C1)

• Fuse (FUSE)

• Varistor (ZNR)

• Terminal block (TB)

Figure 2

Corner
panel

Photo 2

Connector

Screws

Photo 3

Fan motor

Capacitor

(C1)

Screw

Indoor
controller
board (I.B)

Corner
panel

Indoor
power
board
(P.B)

Air intake grille

Panel

Terminal
block
(TB5)

Screws

Panel

Terminal
block
(TB15)

2323

Indoor controller
box

Varistor
(ZNR)

Fuse
(FUSE)

Terminal
block
(TB2)

OPERATING PROCEDURE

PHOTOS&ILLUSTRATIONS

5. Removing the room temperature detection (TH21)

(1) Remove the panel. (Refer to 3)

(2) Pull out the room temperature detection from the drain pan.
(3) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(4) Remove the connector (CN20) from the indoor controller

board, and disconnect the room temperature detection.

6. Removing the drain pan

(1) Remove the panel. (Refer to 3)

(2) Remove the room temperature detection and the 2 lead

wires held with fastener; wireless controller board relay
connector (9P red) and panel relay connector (10P white).

(3) Remove the 4 screws fixed to the drain pan, and remove

the drain pan.

(4) Remove the fan guard. (Refer to 2)

7. Removing the pipe temperature detection/liquid (TH22)
and pipe temperature detection/gas (TH23)

(1) Remove the panel. (Refer to 3)
(2) Remove the drain pan. (Refer to 6)

(3) Disconnect the pipe temperature detection/liquid or the pipe

temperature detection/gas from the holder.

(4) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See photo 9)

(5) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

Photo 4

Screw

Room
temperature
detection
(TH21)

Screw

Photo 5

Control box

Fan guard

Control box

Connectors

Drain plug

Screw

Drain pan

Screw

LEV

Pipe temperature detection/liquid (TH22)

(6) Remove the connector (CN21) from the indoor controller

board, and disconnect the pipe temperature detection/liquid.

Pipe temperature detection/gas (TH23)

(6) Remove the connector (CN29) from the indoor controller

board, and disconnect the pipe temperature detection/gas

with its holder.

8. Removing the fan motor (MF)

(1) Remove the panel. (Refer to 3)
(2) Remove the drain pan. (Refer to 6)

(3) Remove the nut and the washer from the turbo fan, and

remove the turbo fan.

(4) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(5) Disconnect the connector of the FAN from the indoor con-

troller board.

(6) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See photo 9)

(7) Remove the 6 screws fixed to the flat plate, and remove

the flat plate.

(8) Disconnect the lead wires to the direction of the fan motor,

and remove the 3 nuts of the fan motor.

Photo 6

Nut

Flat plate

Fan
motor
(MF)

Thermistor
(Pipe temperature
detection/ Liquid)
(TH22)

Screws

Nuts

Thermistor
(Pipe temperature
detection/ Gas)
(TH23)

Screws

Lead
wires

Screws

24

OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS

9. Removing the drain pump (DP) and drain sensor (DS)

(1) Remove the panel. (Refer to 3 )
(2) Remove the drain pan. (Refer to 6)

(3) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(4) Remove the connectors of the (CNP) and the (CN31)

from the indoor controller board.

(5) Remove the 1 screw fixed to the cover, and remove the

cover.

(6) Disconnect the lead wires to the direction of the drain

pump.(See photo 7)
(7) Remove the 3 screws of the drain pump.
(8) Cut the drain hose band, pull out the drain hose from the

drain pump.
(9) Pull out the drain pump.
(10) Remove the drain sensor and the holder.

10. Removing the heat exchanger

(1) Remove the panel. (Refer to 3 )
(2) Remove the drain pan. (Refer to 6)

(3) Remove the nut and the washer from the turbo fan, and

remove the turbo fan.

(4) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(5) Disconnect the connector of the FAN from the indoor con-

troller board.

(6) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See photo 9)

(7) Remove the pipe temperature thermistor/liquid and

condenser/evaporator temperature thermistor. (Refer to 7)

(8) Disconnect the lead wires to the direction of the fan motor.
(9) Remove the 1 coil support screw, the 2 inside coil screws

(See photo 10), and the 4 outside coil screws (See photo 9)
from the heat exchanger, and remove the heat exchanger.

Photo 7

Control
box

Photo 8

Drain
hose

Screw

Photo 9

Screws of
piping cover

Piping cover

Screw

Drain sensor (DS) Drain pump (DP)

Fixing band

Lead wires

Cover

Lead wires

Screws

Control box

Control box

Coil
screws

25

Photo 10

Coil
support

Coil
support Screw

Coil screws

Heat exchanger

26

27

TM

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN

cCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in May 2009 No. OCH463 PDF 6
Made in Japan

New publication, effective May 2009
Specifications subject to change without notice