Mitsubishi PFFY-P20VLEM-A, PFFY-P25VLEM-A, PFFY-P32VLEM-A, PFFY-P40VLEM-A, PFFY-P50VLEM-A Service Manual

TECHNICAL & SERVICE MANUAL

Air-Conditioners For Building Application

<Indoor unit>

PFFY-P25VLEM-A,PFFY-P25VLRM-A

PFFY-P20VLEM-A,PFFY-P20VLRM-A
PFFY-P32VLEM-A,PFFY-P32VLRM-A

PFFY-P40VLEM-A,PFFY-P40VLRM-A
PFFY-P50VLEM-A,PFFY-P50VLRM-A
PFFY-P63VLEM-A,PFFY-P63VLRM-A

2001

Models

Floor Standing Type

Series PFFY

CONTENTS

SAFETY PRECAUTIONS·························1

1. FEATURES············································3

2. PART NAMES AND FUNCTIONS········4

3. SPECIFICATION ···································6

4. OUTLINES AND DIMENSIONS············8

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

6.

REFRIGERANT SYSTEM DIAGRAM

····11

7.TROUBLE SHOOTING························12

8. DISASSEMBLY PROCEDURE···········17

For use with the R407C & R22

Exposed type

Concealed type

1

- Inadequate connection and fastening may generate heat and
cause a fire.

• Prepare for typhoons and other strong winds and earthquakes
and install the unit at the specified place.

- Improper installation may cause the unit to topple and result in

injury.

• Always use an air cleaner , humidifier, electric heater, and other
accessories specified by Mitsubishi Electric.

- Ask an authorized technician to install the accessories. Improper

installation by the user may result in water leakage, electric shock,
or fire.

• Never repair the unit. If the air conditioner must be repaired,
consult the dealer.

- If the unit is repaired improperly, water leakage , electric shoc k, or

fire may result.

• Do not touch the heat exchanger fins.

- Improper handling may result in injury.

• If refrigerant gas leaks during installation work, ventilate the
room.

- If the refrigerant gas comes into contact with a flame, poisonous

gases will be released.

• Install the air conditioner according to this Installation Manual.

- If the unit is installed improperly, water leakage , electric shock, or

fire may result.

• Have all electric work done by a licensed electrician according
to “Electric Facility Engineering Standard” and “Interior Wire
Regulations”and the instructions given in this manual and al­ways use a special circuit.

- If the power source capacity is inadequate or electric work is per-

formed improperly, electric shoc k and fire may result.

• Securely install the cover of control box and the panel.

- If the cover and panel are not installed properly, dust or water

may enter the outdoor unit and fire or electric shock may result.

• When installing and moving the air conditioner to another site,
do not charge the it with a refrigerant different from the refrig­erant (R407C or R22) specified on the unit.

- If a different refrigerant or air is mixed with the original refrigerant,

the refrigerant cycle may malfunction and the unit may be dam­aged.

• If the air conditioner is installed in a small room, measures
must be taken to prevent the refrigerant concentration from
exceeding the safety limit even if the refrigerant should leak.

- Consult the dealer regarding the appropr iate measures to pre-

vent the safety limit from being exceeded. Should the refrigerant
leak and cause the safety limit to be exceeded, hazards due to
lack of oxygen in the room could result.

• When moving and reinstalling the air conditioner, consult the
dealer or an authorized technician.

- If the air conditioner is installed improperly, water leakage, elec-

tric shock, or fire may result.

• After completing installation work, make sure that refrigerant
gas is not leaking.

- If the refrigerant gas leaks and is exposed to a fan heater, stove,

oven, or other heat source, it may generate noxious gases.

• Do not reconstruct or change the settings of the protection
devices.

- If the pressure switch, thermal switch, or other protection device

is shorted and operated forcibly , or parts other than those specified
by Mitsubishi Electric are used, fire or explosion may result.

1. Before installation and electric work

s Before installing the unit, make sure you read all the

“Safety precautions”.

s The “Safety precautions” provide very important

points regarding safety. Make sure you follow them.

s This equipment may not be applicable to EN61000-3-

2: 1995 and EN61000-3-3: 1995.

s

s Please report to or take consent by the supply au-

thority before connection to the system.

Symbols used in the text

Warning:

Describes precautions that should be observed to prevent danger
of injury or death to the user.

Caution:

Describes precautions that should be observed to prevent damage
to the unit.

Symbols used in the illustrations

: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Indicates that caution should be taken with rotating parts. (This

symbol is displayed on the main unit label.) <Color: Yellow>

: Beware of electric shock (This symbol is displayed on the main

unit label.) <Color: Yellow>

Warning:

Carefully read the labels affixed to the main unit.

Warning:

• Ask the dealer or an authorized technician to install the air con­ditioner.

- Improper installation by the user may result in water leakage, elec-

tric shock, or fire.

• Install the air unit at a place that can withstand its weight.

- Inadequate strength may cause the unit to fall down, resulting in

injuries.

• Use the specified cables for wiring. Make the connections se­curely so that the outside force of the cable is not applied to the
terminals.

This equipment may have an adverse effect equip­ment on the same electrical supply system.

SAFETY PRECAUTIONS

2

2. Precautions for devices that use
R407C refrigerant

Caution:

• 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.

*JIS: Japanese Industrial Standard

• 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 will degrade if it is mixed with a large amount of

mineral oil.

• Use liquid refrigerant to fill the system.

- If gas refr igerant 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 refrig-

erant may cause the refrigerator oil to deteriorate.

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

- The vacuum pump oil may flow bac k into the refrigerant cycle and

cause the refrigerator oil to deteriorate.

• Do not use the following tools that are used with con ventional
refrigerants.
(Gauge manifold, charge hose, gas leak detector, reverse flow
check valve, refrigerant charge base, vacuum gauge, refriger­ant recovery equipment)

- If the conventional refrigerant and refrigerator oil are mixed in the

R407C, the refrigerant may deteriorated.

- If water is mixed in the R407C, the refrigerator oil ma y deteriorate.

- Since R407C does not contain any chlorine, gas leak detectors

for conventional refrigerants will not react to it.

• Do not use a charging cylinder.

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

• Be especially careful when managing the tools.

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

may deteriorate.

3

PFFY-P20VLEM-A,PFFY-P20VLRM-A
PFFY-P25VLEM-A,PFFY-P25VLRM-A
PFFY-P32VLEM-A,PFFY-P32VLRM-A
PFFY-P40VLEM-A,PFFY-P40VLRM-A
PFFY-P50VLEM-A,PFFY-P50VLRM-A
PFFY-P63VLEM-A,PFFY-P63VLRM-A

2.2/ 2.5

2.8/ 3.2

3.6/ 4.0

4.5/ 5.0

5.6/ 6.3

7.1/ 8.0

Floor Standing Type

Series PFFY

Models

Cooling capacity/Heating capacity

kW

FEATURES1

Concealed type

Exposed type

4

●

● ● Remote

Indoor (Main) Unit

controller

[PAR-20MAA]

Once the controls are set, the same operation mode can

be repeated by simply pressing the ON/OFF button.

● Operation buttons

PAR-20MAA

ON/OFF

CENTRALLY CONTROLLED

ERROR CODE

CLOCK

ON OFF

ßC

CHECK

CHECK MODE

FILTER

TEST RUN
FUNCTION

ßC

1Hr.

NOT AVAILABLE

STAND BY
DEFROST

FILTER

CHECK TEST

TEMP.

TIMER SET

1

2

3

4 56879

0

C

A

B

1 [Room temperature adjustment] Button
2 [Timer/continuous] Button
3 [Selecting operation] Button
4 [Time selection] Button

[Time-setting] Button

5 [Louver] Button
6 [Fan speed adjustment] Button

7 [Up/down airflow direction] Button
8 [Ventilation] Button
9 [Checking/built-in] Button
0 [Test run] Button
A [Filter] Button
B [ON/OFF] Button
C Position of built-in room temperature

¥Never expose the remote controller to direct sunlight.Doing so can result in the erroneous measure-

ment of room temperature.

¥Never place any obstacle around the lower right-hand section of the remote controller. Doing so can

result in the erroneous measurement of room temperature.

PART NAMES AND FUNCTIONS2

Concealed type

Exposed type

Air outlet

Air outlet

Air inlet

Air inlet

5

● Display

(A) Current time/Timer
(B) Centralized control
(C) Timer ON
(D) Abnormality occurs
(E) Operation mode: COOL, DRY, AUTO, FAN, HEAT
(F) Preparing for Heating mode
(G) Defrost mode
(H) Set temperature
(I) Power ON
(J) Louver
(K) Not available function
(L) Ventilation
(M) Function setting mode
(N) Test run mode
(O) Error check mode
(P) Filter sign
(Q) Set effective for 1 hr.
(R) Sensor position
(S) Room temperature
(T) Airflow
(U) Fan speed

ABCD

SQTU

E

F

STAND BY
DEFROST

G

CENTRALLY CONTROLLED

CHECK

˚C

ON OFF

CLOCK

ERROR CODE

TEMP.

HIKLJ

1Hr.

NOT AVAILABLE

˚C

ON/OFF

FILTER

CHECK MODE

TEST RUN
FUNCTION

R
P

O
N
M

6

Power source

Model

PFFY-P20

VLEM-A

PFFY-P25

VLEM-A

PFFY-P32

VLEM-A

PFFY-P40

VLEM-A

PFFY-P63

VLEM-A

Item

Dimension

Fan

Motor

Refrigerant

pipe dimension

Power consumption

Current

Cooling capacity
Heating capacity

External finish (Munsel No.)

Net weight

Heat exchanger

Air filter

Drain pipe dimension

Noise level

(Low-High)

Voltage

Frequency

Cooling
Heating
Cooling
Heating

Height

Width
Depth

Type

External static pressure

Type

Output

Gas(Flare)

Liquid(Flare)

~V

Hz
kW
kW

kW
kW

A
A

mm
mm
mm

kg

m3/min

Pa

kW

mm
mm

220-240 208-230

50 60

3.6

4.0

0.06

0.06

0.29

0.29

Galvanized steel plate (5Y 8/1)

630

220

25

Cross fin( Alminium plate fin and copper tube)

0

Single phase induction motor

PP Honeycomb fabric

Accessory hose (top end:20)

4.5

5.0

7.1

8.0

2.2

2.5

2.8

3.2

0.04

0.04

0.19

0.19

0.06

0.06

0.25

0.25

220-240 208-230

50 60

0.04

0.04

0.19

0.19

0.06

0.06

0.25

0.25

220-240 208-230

50 60

0.07

0.07

0.30

0.30

220-240 208-230

50 60

0.075

0.075

0.33

0.33

220-240 208-230

50 60

0.09

0.09

0.41

0.41

220-240 208-230

50 60

0.11

0.11

0.47

0.47

11701050

Note:1
Note:1

Note:2

Note:2

23

Sirocco fanX1

5.5-6.5 7.0-9.0 9.0-11.0 12.0-14.0 12.0-15.5

0.015

23

5.5-6.5

0.015 0.018 0.030 0.035 0.050

Sirocco fanX2

26 32

1410

Airflow rate

(Low-High)

40-4638-4335-4034-40

0.065

0.065

0.32

0.32

0.10

0.10

0.46

0.46

ø 12.7
ø 6.35

ø 15.88

ø 9.52

PFFY-P50

VLEM-A

5.6

6.3

30

0.085

0.085

0.40

0.40

Power source

Model

PFFY-P20

VLRM-A

PFFY-P25

VLRM-A

PFFY-P32

VLRM-A

PFFY-P40

VLRM-A

PFFY-P63

VLRM-A

Item

Dimension

Fan

Motor

Refrigerant

pipe dimension

Power consumption

Current

Cooling capacity
Heating capacity

External finish (Munsel No.)

Net weight

Heat exchanger

Air filter

Drain pipe dimension

Noise level

(Low-High)

Voltage

Frequency

Cooling
Heating
Cooling
Heating

Height

Width
Depth

Type

External static pressure

Type

Output

Gas(Flare)

Liquid(Flare)

~V

Hz
kW
kW
kW
kW

A
A

mm
mm
mm

kg

m3/min

Pa

kW

mm
mm

3.6

4.0

Galvanized steel plate

639

220

20

Cross fin( Alminium plate fin and copper tube)

0

Single phase induction motor

PP Honeycomb fabric

Accessory hose (top end:20)

4.5

5.0

7.1

8.0

2.2

2.5

2.8

3.2

1006886

Note:1
Note:1

Note:2

Note:2

18.5

Sirocco fan

X

1

5.5-6.5 7.0-9.0 9.0-11.0 12.0-14.0 12.0-15.5

0.015

18.5

5.5-6.5

0.015 0.018 0.030 0.035 0.050

Sirocco fanX2

21 27

1246

Airflow rate

(Low-High)

40-4638-4335-4034-40

ø 12.7
ø 6.35

ø 15.88

ø 9.52

PFFY-P50

VLRM-A

5.6

6.3

25

Note: 1.Cooling / Heating capacity indicates the maximum value at operation under the following condition.

Cooling :Indoor 27°CDB/19°CWB Heating :Indoor 20°C

:Outdoor 35°CDB :Outdoor 7°CDB/6°CWB

220-240 208-230

50 60

0.06

0.06

0.29

0.29

0.04

0.04

0.19

0.19

0.06

0.06

0.25

0.25

220-240 208-230

50 60

0.04

0.04

0.19

0.19

0.06

0.06

0.25

0.25

220-240 208-230

50 60

0.07

0.07

0.30

0.30

220-240 208-230

50 60

0.075

0.075

0.33

0.33

220-240 208-230

50 60

0.09

0.09

0.41

0.41

220-240 208-230

50 60

0.11

0.11

0.47

0.47

0.065

0.065

0.32

0.32

0.10

0.10

0.46

0.46

0.085

0.085

0.40

0.40

2.The figures represent a 240V/50Hz or 230V/60Hz unit measured at a point which is 1m away from the front of the unit and at a height of 1m
from the floor.

The noise is approximately 1dB(A) less for a 230V/50Hz or 220V/60Hz unit and approximately 2dB(A) less for a 220V/50Hz or 208V/60Hz

unit. The noise is approximately 3dB(A) less when the measurement point is 1.5m away from the front of the unit and at a height of 1.5m
from the floor.

SPECIFICATION3

3-1. Specification

7

LEV

C1 1.5µF X 440V

2.5µF
X

440V

2.0µF
X

440V

MF1,2

PFFY-P20

VLEM-A
VLRM-A

PFFY-P63

VLEM-A
VLRM-A

PFFY-P50

VLEM-A

VLRM-A

PFFY-P40

VLEM-A
VLRM-A

PFFY-P32

VLEM-A
VLRM-A

PFFY-P25

VLEM-A
VLRM-A

Model

Parts

name

Tranrsformer T

(Primary) 50/60Hz 220-240V (Secondary) (18.4V 1.7A)

TH21 Resistance 0˚C/15kΩ,10˚C/9.6kΩ,20˚C/6.3kΩ,25˚C/5.4kΩ,30˚C/4.3kΩ,40˚C/3.0kΩ

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

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

TH22

Gas pipe
thermistor

FUSE

250V 6.3A

TB2

(L,N, ) 330V 30A

TB5
TB15

(1,2),(M1,M2,S) 300V 10A

Fuse

(Indoor con-

troller board)

Power supply
terminal bed

Transmission
terminal bed

OFF 130˚C±5˚C

ON 90˚C±20˚C

Room
temperature
thermistor

Fan motor

(with Inner-

thermostat)

4-pole

OUTPUT 15W

CU-0206B-A

4-pole

OUTPUT 15W

CU-0206B-A

4-pole

OUTPUT 18W

CU-0207B-A

4-pole

OUTPUT 30W

CU-0303B-A

4-pole

OUTPUT 35W

CRC4415AB

4-pole

OUTPUT 50W

CU-0507B-A

Symbol

DC12V Stepping motor drive port

dimension 3.2

Ω

(0~2000pulse)

EDM-402MD

TH23

Inner­thermostat/

thermofuse

(Fan motor)

Liquid pipe
thermistor

Fan motor
capacitor

Linear
expansion valve

152˚C ˚C

+5

0

FUSE

CUT OFF

3-2. Electrical par ts specification

8

78

C

Remote controller

(PAR-F25MA)can be built-in.

(Program timer can not be

built-in together)

ø

6.35

ø

12.77307207601170

PFFY-P63VLEM-A

PFFY-P40VLEM-A

1410 1000 960 970

960 970

ø

15.88

ø

9.52

ø

15.88

ø

9.52

Dimensions

310 108

170

160

Refrigeant piping flare

connection(Liquid) F : HP

15

80

15

OD

ø

27(TOP

ø

20)

4 pcs.(attached)

Level adjusting screw

630

Air supply grille

Floor mounting hole

2-12 ✕16

Wall mounting hole

2 ✕ 2-12 ✕16

Piping

space

6

17025

183.5 21

106

B

170 300

( 75 ) 500

20

35

220

(60)40 120

B

A

10

220220

10

Hose(accessory)

Strainer

Drain pan

Air filter

430

90

45

D

10001410

PFFY-P50VLEM-A

PFFY-P32VLEM-A

PFFY-P25VLEM-A

Model

ø

6.35

ø

6.35

ø

12.7

ø

12.7

730

610

720

600

760

640

1170

1050

F

(Liquid)E(Gas)DCBA

Refrigerant piping flare

connection(Gas)

E : LP

35

50

100

Air outlet

Air

inlet

PFFY-P20VLEM-A

ø

6.35

ø

12.76106006401050

OUTLINES AND DIMENSIONS4

Indoor Unit

PFFY-P20·25·32·40·50·63VLEM-A

Unit:mm

15

15

80

Duct mounting hole

2 ✕ F -

ø

4.7

9

400

167

310 90

A

132 15

Floor mounting hole

OD

ø

27(TOP

ø

20)

Hose(accessory)

Strainer

Drain pan

Air filter

Wall mounting hole

4 pcs.(attached)

Level adjusting screw

Refrigeant piping flare

connection(Liquid) H : HP

Refrigerant piping flare

connection(Gas) G : LP

H(Liquid)G(Gas)

ø6.35ø12.754807306927601006

Dimensions

Model

PFFY-P63VLRM

-A

PFFY-P40VLRM

-A

PFFY-P32VLRM

-A

PFFY-P25VLRM

-A

2 ✕ 2 - 12 ✕ 16

300170

( 75 )

2-12 ✕ 16

B

430

639

90

106

B

45

76 D

ø9.52

ø6.35

ø6.35

ø15.88

ø12.7

ø12.7

7

5

4

720

480

360

970

730

610

932

692

572

1000

760

640

1246

PFFY-P50VLRM

-A

ø9.52ø15.88772097093210001246

1006

886

FEDCBA

Duct mounting hole

2-

ø

4.7

898 30

49

10

220

35

50

100

84

29

C

E

120

Air

inlet

Air outlet

PFFY-P20VLRM

-A

ø6.35ø12.74360610572640

886

9

Indoor Unit

PFFY-P20·25·32·40·50·63VLRM-A

Unit:mm

10

Switch(for voltage selection)

Aux.relay

POWER SUPPLY

~

220-240V 50Hz

~

208-230V 60Hz

BREAKER(16A)

FUSE(16A)

PULL BOX

TO NEXT INDOOR UNIT

Switch (connection No.set)

Switch (2nd digit address set)

Thermistor (piping temp.detection/gas)

Thermistor (piping temp.detection/liquid)

Switch(for mode selection)

✻

Capacitor

MODELS 20/25/32/40 1.5 F

MODEL 50 2.0 F

MODEL 63 2.5 F

TO OUTDOOR UNIT

TO MA REMOTE CONTROLLER

BC CONTROLLER

REMOTE CONTROLLER

Switch(for model selection)

Switch(for capacity code)

Switch(for mode selection)

SW5(A.B)

X04~06

Surge absorber board

S.B

Transmission terminal bed

TB5

Transmission terminal bed

TB15

Power source terminal bed

TB2

Switch (1st digit address set)

Thermistor (inlet temp.detection)

Address board

Indoor controller board

✻Capacitor (for MF)

Fan motor

NAME SYMBOL

Electronic linear expan. valve

Transformer

Fuse AC250V 6.3A F

NAME SYMBOL

SYMBOL EXPLANATION

SW4(I.B)

SW14(A.B)

TH23

SW3(I.B)

SW2(I.B)

SW1(A.B)

SW12(A.B)

SW11(A.B)

TH22

TH21

LEV

T

F

A.B

I.B

C

MF

C

TB5(TRANSMISSION TERMINAL BED)

TB15(TRANSMISSION TERMINAL BED)

TB2

1

2

3

4

5

6

7

8

0

8

7

6

5

4

3

2

1

0

9

1

2

3

4

5

6

7

8

9

0

9

A

B

C

D

E

F

PE

(White)

(White)

(Black)(White)

(White)(Red) (Black)

65

SW5

CN62

CN82

AC250V

6.3A F

( )

S.B

DSA1

CN1

1

3

ZNR1

123456

123456

21 31

21 31

T

2

ZNR

F

X06 X05 X04

413

2413

7

TH21

SW4

CN42

4

321

4321

78

TH23

21

CN29

SW11

(1st digit)

SW12

(2nd digit)

8

7

1

2

3

4

5

6

SW14

(Connection No.)

A.B

CN3T

31

M2

S(SHIELD)

M1

2

1

SW1

SW2

SW3

TH22

MF

LEV

N

L

625

1

4

311

3222

533

1111654321

CN81 CN20 CN21 CN31 CN60

CNT

CND

FAN3

CN2M

I.B

1

2

CN3A

1

3

WIRING DIAGRAM5

11

Gas pipe

PFFY-P20,25,32,40VLEM-A

ø12.7<1/2F>

PFFY-P50,63VLEM-A

PFFY-P20,25,32,40VLRM-A PFFY-P50,63VLRM-A

ø15.88<5/8F>

Liquid pipe

ø6.35<1/4F> ø9.52<3/8F>

Capacity

Item

REFRIGERANT SYSTEM DIAGRAM6

Gas pipe thermistor TH23

Gas pipe

Liquid pipe thermistor TH22

Flare connection

Heat exchanger

Linear expansion valve

Strainer (#100mesh)

Room temparature thermistor TH21

Strainer (#100mesh)

12

Room temparature
thermistor

(TH21)

Liquid pipe thermistor

(TH22)

Gas pipe thermistor

(TH23)

Transformer

Fan motor

Linear expansion
valve

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

Disconnect the connector and measure the resistance using a tester.

Measure the resistance between the terminals using a tester. (at 20˚C)

Disconnect the connector then measure the resistance valve using a tester.
Refer to the next page for a detail.

Normal

4.3kΩ~9.6kΩ

Abnormal

Open or short

CNT(1)-(3)

Normal

App.45

Ω

CN3T(1)-(3)

App.1

Ω

Abnormal

Open or short

Normal

(1)-(5)

White-Red

150

Ω

±10%

Abnormal

Open or short

(2)-(6)

Yellow-

Blown

(3)-(5)

Orange-Red

(4)-(6)

Blue-Brown

1
2
3

1
2
3

CNT T CN3T

Red Blue

Blue

White

1
2
3
4
5
6

LEV

White
Yellow

Orange
Blue

Red
Brown

CN60

Parts name Check points

1

Blue

Black

Red

White

Yellow

White

Relay connector

C

PFFY-P20~50
VLEM-A/VLRM-A

PFFY-P63
VLEM-A/VLRM-A

Motor terminal

or

Relay connector

Normal

Abnormal

Open or short

Measure the resistance between the terminals using a tester. (at 20˚C)

Motor terminal

or

Relay connector

Normal

Abnormal

Open or short

3

4

2
1

1

Blue

Black

Red

White

Yellow

White

Relay connector

Protector

C

3

4

2
1

Black - White
Red - Yellow
Yellow - Blue

Blue - Black

335.0

P20,P25

174.0

56.8

99.6

Black - White
Red - Yellow
Yellow - Blue

Blue - Black

112.0

P63

78.0

12.7

50.8

294.0

P32

150.0

52.0

78.0

114.0

P40

80.0

30.0

42.0

101.4

P50

60.3

15.1

29.4

(Refer to the thermistor characteristic graph
on next page.)

7 TROUBLE SHOOTING

7-1. How to check the parts

13

< Thermistor for lower temperature >

<Thermistor Characteristic graph>

Room temparature thermistor(TH21)
Liquid pipe thermistor(TH22)
Gas pipe temparature thermistor(TH23)
Drain sensor(DS)

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

Rt=15exp { 3480( ) }
0˚C 15kΩ

10˚C 9.6kΩ
20˚C 6.3kΩ
25˚C 5.2kΩ
30˚C 4.3kΩ
40 3.0kΩ

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

50

40

30

Resistance (kΩ )

20

10

0

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

Linear expansion valve

4

M

6

2

5

White

1

Red

3

Orange

Blue

Brown

Yellow

ø4
ø3

ø2
ø1

Brown

Red

Blue

Orange

Yellow

White

Connector(CN60)

Controller board

DC12V

6
5

4
3

2
1

Drive circuit

ø4
ø3

ø2
ø1

Output

(Phase)

Output

ø1

1

ON

ø2

ON

ø3

OFF

ø4

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

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 temper-

ature 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.

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 vale.

Exchange the linear
expansion valve.

If large amount of refriger­ation 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

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 shifts 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 will locks 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 dri­ver handle while putting the screw driver to the linear expansion
valve.

14

Valve position (capacity)

A

E

B

Close

D

Open

Pulse number

C

2000 pulse
Opening a valve
all the way

Extra tightning (80~100pulse)

LED1kΩ

Thermistor
(TH21)

Linear
expansion
valve

6
5
4
3
2
1

150Ω

10%.

15

1
2
3
4
5
6
7
8
9

10

1~6

1
2
3
4
5
6
7
8

1~4

Thermistor<Intake temperature
detection>position

ON OFF

Filter crogging detection Provided Not provided
Filter life 2,500hr 100hr
Air intake Effective Not effective
Remote indication switching Ther mostat ON signal indication Fan output indication
Humidifier control

Always operated while the heat is ON

Operated depends on the condition
Air flow st Low Extra low
Heat thermostat OFF Setting air flow Reset to SW1-7
Auto reset function Effective Not effective
Power ON/OFF Effective Not effective

Heat pump/Cool only Cooling only Heat pump
Louver Available Not available
Vane Available Not available
Vane swing function Available Not available
Vane holizontal angle Second setting First setting
Vane cooling limit angle setting

Horizontal angle Down blow

Heating 4deg up Not effective Effective

ON

OFF

12345678

ON

OFF

12345678910

ON

OFF

123456

ON

OFF

123456

MODELS SW2 MODELS SW2 MODELS SW2

PFFY -

P20VLEM-A

PFFY -

P40VLEM-A

PFFY-

P25VLEM-A

PFFY-

P25VLRM-A

Address board

<At delivery>

Indoor controller board

Indoor controller board

Indoor controller board

<At delivery>

<At delivery>

SW4

Unit

Selection

SW3

Function

Selection

SW2

Capacity

code

setting

SW1

Mode

Selection

Switch Pole

Function

Built-in remote controller

Indoor unit

Set while the unit is off.

<At delivery>

Set for each capacity.

Set while the unit is off.

(Note) At cooling mode, each

angle can be used only 1
hour.

Set while the unit is off.

Operation by switch

Remarks

ON

OFF

123456

PFFY­P32VLEM-A

PFFY -

P40VLRM-A

PFFY-

P25VLRM-A

ON

OFF

123456

ON

OFF

123456

ON

OFF

123456

PFFY -

P20VLRM-A

PFFY-

P50VLEM-A

ON

OFF

123456

ON

OFF

123456

ON

OFF

123456

PFFY-

P63VLEM-A

PFFY
P32VLRM-A

PFFY

P63VLRM-A

ON

OFF

123456

ON

OFF

123456

ON

OFF

123456

Note :The DipSW setting is effective during unit stopping ( remote controller OFF ) for SW1,2,3 and 4 commonly and the

power source is not required to reset.

ON

OFF

1234

7-2. Function of Dip-switch

16

Address board

Address board

Address board

Address board

Operation by switchSwitch Pole Remarks

✻ As this switch is used by interlocking with

SWC,refer to the item of SWC for detail

<At delivery>

<At delivery>

<At delivery>

<At delivery>

1~3

SWA

Option

2

SWC

Option

SW11
1st digit
address

setting

SW12

2nd degit

address

setting

Rotary switch

SW14

Connect

ion No.

setting

Rotary switch

When attach the optional high perfor­mance filter elements (filter casement)
to the unit, be sure to attach it to the
option side in order to prevent the air­flow reducing.

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 series outdoor unit as
a set.

Address board

<At delivery>

2

SW5

Voltage

Selection

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.

Note:1

Note:1

Note:2

Note:2

Note:2

Note 1:The DipSW setting is effective always after powering ( remote controller ON ) for SWA and SWC.

2:The DipSW setting is effective during unit stopping ( remote controller OFF ) for SW11,12,14 and 5

(Option)

(Standard)

(Option)

(Standard)

3
2
1

3
2
1

1
2
3

(SWA)

SW12

9

8

7

10

0

6

5

1

2

3

4

SW14

0

1

F

E

D

C

B

A

8

9

SW11

9

8

7

6

1

2

3

4

5

6

7

0

5

220V 240V

SWC

1

2

3

4

SW12

9

8

7

0

6

5

1

2

3

4

SW14

0

1

F

E

D

C

B

A

8

9

SW11

0

9

8

7

6

2

3

4

5

6

7

1

2

3

4

5

220V 240V

(A)

(B)

Fig.1

Fig.2

Fig.3

(A)

DISASSEMBLY PROCEDURE8

8-1 CONTROL BOX (Exposed type PFFY-P·VLEM)

Be careful removing heavy parts.

1.Removing the front panel (A)

(1)Remove the fixing screws(two) of the front

panel(A).(Fig.1)

(2)Hold the bottom of the front panel with your

hands,and gently lift it. The front panel should fall
down forward.(Fig.2)

2.Removing the control box cover (B)

(1)Remove the fixing screws(two) of the co ver(B) and

remove the cover.(Fig.3)

17

OPERATING PROCEDURE PHOTOS

18

(D)

(C)

(E)

(F)

Fig.1

Fig.2

Fig.3

Fig.4

(A)

(B)

(B)

8-2 THERMISTOR (Gus and liquid piping temperature detection)

1.Removing the side casing

(1)Open the control panel cover(A), remov e the fixing

screws(two) of the securing cover. (Fig. 1)

(2)Pull up the side casing(B). (Fig. 2)

OPERATING PROCEDURE PHOTOS

2.Removing the thermistor

(1)Remove the fixing screws (three), remove the

cover (C) and (D).(Fig. 3)

(2)Remove the thermistor (gas)(E) and the thermistor

(liquid)(F). (Fig. 4)

19

Be careful

Thermistor

Fig.1

Fig.1

Fig.2

➀

OPERATING PROCEDURE PHOTOS

1.Removing the drainpan

(1)Remove the fixing screw of the side frame by the

control box. (Fig. 1)

(2)Slide the drainpan in the direction of the arrow ➀.

8-4 DRAINPAN

1.Removing the thermistor

(1)Remove the thermistor under the control box.

8-3 THERMISTOR (Intake air temperature detection)

PHOTOSOPERATING PROCEDURE

Fig.1

(a)

(a)

➀

(A)

fan motor shaft
fixing screw

Fig.2

(b)

(b)

(c)

(c)

20

OPERATING PROCEDURE PHOTOS

8-5 FAN and FAN MOTOR

1.Sliding the fan section (Fig.1)

(1)Remove the fixing screws(two) (a).
(2)Slide the fan section in direction of the arrow ➀.

2.Removing the fan motor (Fig.2)

(1)Remove the fixing screws (two)(b) of the fan cas-

ing(A).

(2)Remove the fan motor shaft fixing screw and

remove the fan casing(A) and sirroco fan.

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

tures (two) and remove the motor.

Notice:In case of the Model(PFFY-P32~63) stick out

the motor shafts on both side of the motor.

21

OPERATING PROCEDURE PHOTOS

8-6 HEAT EXCHANGER

1.Removing the casing

(1)Remove the fixing screws(six) and remove the

casing. (Fig.1)

2.Removing the cover1,2 with procedure 8-2

(Fig. 2)

3.Removing the Heat exchanger

(1)Remove the fixing screws(four) and remove the

heat exchanger support. (Fig. 3)

(2)Remove the heat exchanger, moving from side to

side.

Fig.1

Cover 1

Cover 2

Fig.2

Fig.3

Fig.1

Fig.2

Fig.3

(A)

(B)

22

OPERATING PROCEDURE PHOTOS

8-7 CASING (Concealed type PFFY-P·VLRM)

1.Removing the casing ass’y

(1)Remove the fixing screws (nine) of the plate(A)

and remove the plate.(Fig. 1)

2.Removing the air diffuser ass’y

(1)Remove the fixing screws (eight) of the air diffuser

ass’y(B) and remove it.(Fig. 2)

Note: Without this section, almost the disassembly

procedures are same as Exposed type (PFFY­P·VLEM) and Concealed type (PFFY­P·VLRM).

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

Issued in May. 2001 MEE01K053
Printed in Japan

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