Mitsubishi OC333 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

ON/OFF

TEMP.

SERVICE MANUAL

July 2005

No. OC333

Indoor unit
[Model names] [Service Ref.]

PMH-P25BA PMH-P25BA
PMH-P35BA PMH-P35BA
PMH-P50BA PMH-P50BA

NOTE:

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

CONTENTS

INDOOR UNIT

REMOTE CONTROLLER

1. REFERENCE MANUAL······································2

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

3. PART NAMES AND FUNCTIONS ···················4

4. SPECIFICATIONS············································6

5. NOISE CRITERION CURVES··························7

6. OUTLINES AND DIMENSIONS·······················8

7.

WIRING DIAGRAM

8.

REFRIGERANT SYSTEM DIAGRAM

9. TROUBLESHOOTING ···································11

10. DISASSEMBLY PROCEDURE ······················22

11. PARTS LIST ···················································25

··············································9

··················10

1

Series (Outdoor unit)

PU(H)-P·VGAA.UK
PU(H)-P·YGAA.UK

Manual No.

OCS02

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 ESTER , 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 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.

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.

REFERENCE MANUAL

1-1. OUTDOOR UNIT’S SERVICE MANUAL

Service Ref.

PU(H)-P·VGAA.UK
PU(H)-P·YGAA.UK

1-2. TECHNICAL DATA BOOK

2

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R407C

Service Manual No.

OC336

2

[1] Cautions for service

Gravimeter

Unit

·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.

[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

3

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

Horizontal Air Outlet

Auto Air Swing Vane

Disperses airflow up and
down and adjusts the angle
of airflow direction.

Guide vane

Air flow can be changed to horizontally
by moving the Guide vane to the left or right.

Filters

Remove dust and pollutants

Inhales air from room.

Air intake

from inhaled air.

● Remote controller

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

● Operation buttons

4

● 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.

5

4

kW

A
A

kW

K/min(CFM)

Pa(mmAq)

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

kg(lbs)

Service Ref.

Mode
Power supply(phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger
Fan Fan(drive) o No.

Fan motor output

Airflow(Low-Medium2-Medium1-High)

External static pressure
Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Unit drain pipe I.D.
Dimensions

Weight

W

D
H

INDOOR UNIT

PMH-P35BA

Cooling

0.06

0.29

0.32

Heating

0.06

0.29

0.32

Single phase, 50Hz, 230V

Unit : Galvanized sheets with gray heat insulation, Grille munsell 0.98Y 8.99/0.63

Plate fin coil

Lineflow fan (direct) o 1

0.028

7.0-8.0-9.0-10.0(247-282-318-353)
0(direct blow)

Remote controller & built-in

34-36-38-40

26(1)
UNIT : 854(33-5/8) PANEL : 1000(39-3/8)
UNIT : 395(15-9/16) PANEL : 470(18-1/2)
UNIT : 230(9-1/16) PANEL : 30(1-3/16)
UNIT : 14(31) PANEL : 3(6.6)

Cooling

0.04

0.19

0.21

Heating

0.04

0.19

0.21

Single phase, 50Hz, 230V

Unit : Galvanized sheets with gray heat insulation, Grille munsell 0.98Y 8.99/0.63

Plate fin coil

Lineflow fan (direct) o 1

0.028

6.3-6.8-7.6-8.4(222-240-268-297)
0(direct blow)

Remote controller & built-in

29-31-33-35

26(1)

PMH-P25BA

kW

A
A

kW

K/min(CFM)

Pa(mmAq)

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

kg(lbs)

Service Ref.

Mode
Power supply(phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger
Fan Fan(drive) o No.

Fan motor output

Airflow(Low-Medium2-Medium1-High)

External static pressure
Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Unit drain pipe I.D.
Dimensions

Weight

W
D
H

INDOOR UNIT

UNIT : 854(33-5/8) PANEL : 1000(39-3/8)
UNIT : 395(15-9/16) PANEL : 470(18-1/2)
UNIT : 230(9-1/16) PANEL : 30(1-3/16)
UNIT : 14(31) PANEL : 3(6.6)

Cooling

0.06

0.29

0.32

Heating

0.06

0.29

0.32

Single phase, 50Hz, 230V

Unit : Galvanized sheets with gray heat insulation, Grille munsell 0.98Y 8.99/0.63

Plate fin coil

Lineflow fan (direct) o 1

0.028

8.0-9.0-10.0-11.0(282-318-353-388)
0(direct blow)

Remote controller & built-in

36-38-40-42

26(1)

PMH-P50BA

kW

A
A

kW

K/min(CFM)

Pa(mmAq)

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

kg(lbs)

Service Ref.

Mode
Power supply(phase, cycle, voltage)

Input
Running current

Starting current
External finish
Heat exchanger
Fan Fan(drive) o No.

Fan motor output

Airflow(Low-Medium2-Medium1-High)

External static pressure
Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Unit drain pipe I.D.
Dimensions

Weight

W

D
H

INDOOR UNIT

UNIT : 854(33-5/8) PANEL : 1000(39-3/8)
UNIT : 395(15-9/16) PANEL : 470(18-1/2)
UNIT : 230(9-1/16) PANEL : 30(1-3/16)
UNIT : 14(31) PANEL : 3(6.6)

SPECIFICATIONS

6

NOISE CRITERION CURVES5

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 µ BAR

BAND CENTER FREQUENCIES, Hz

PMH-P35BA

High

NOTCH

Medium1
Medium2

Low

40

SPL(dB)

38
36
34

LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE THRESHOLD OF
HEARING FOR CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 µ BAR

BAND CENTER FREQUENCIES, Hz

PMH-P25BA

High

NOTCH

Medium1
Medium2

Low

35

SPL(dB)

33
31
29

LINE

Ambient temperature 27:
Test conditions are based on JIS Z8731

UNIT

1.5m

MICROPHONE

CEILING

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 µ BAR

BAND CENTER FREQUENCIES, Hz

PMH-P50BA

High

NOTCH

Medium1
Medium2

Low

42

SPL(dB)

40
38
36

LINE

7

6

OUTLINES AND DIMENSIONS

PMH-P25BA
PMH-P35BA
PMH-P50BA

PMH-P50BA

PMH-P35BA

PMH-P25BA

O.D.{35

O.D.{12.7(1/2") O.D.{15.88(5/8")

O.D.{6.35(1/4") O.D.{9.52(3/8")

Gas pipe

Liquid pipe

pipe cover

Refrigerant

piping

4-{2.8 Burring hole

100

{

90-

PVC pipe:VP-20[O.D.{25(1")]

Details of fresh air intake hole

Drainage piping

122

{

250 288.5

Knock out

Unit : mm

108

110

mounting plate

Flesh air intake hole

235 or more

230

110

Panel(grille):PMP-40BM

74.5

26

20

75926

960 ceiling opening20 20

1000 outer side of grille

811 suspension bolt pitch74.5

20

2828
45
20

Top

247

69

53

17.517.5

43

46

outer line of grille

center of unit

Air outlet(lower)

45
20

340 suspension bolt pitch
430 ceiling opening

470 outer side of grille

302

395

Terminal block for

indoor/outdoor connection

elect box

812

759

{50

230

198

Drainage pipe

PVC pipe:VP-20[O.D.{25]

141

254

Right side

Terminal block for remote controller

suspension bolt(M10 or W3/8)

Installation space required around indoor unit

200600200

drain pan

(56)

Front

(20)

(10)

1000 outer side of grille

(96)

30

470 outer side of grille

60 40

Panel(grille):PMP-40BM

Lower view

ceiling

panel

Refrigerant pipe(gas)

same line

drain pan

96

176

Refrigerant

pipe(liquid)

Left side

ceiling panel

8

6 5 4 3 251

MF

FAN

(WHT)

LED1 CN90 CN32

I.B

LED2

LED3

CN41

2 1

REMOTE

CONTROLLER

CN22
(BLU)

BLU

BLU

TB5

TB4

S1
S2
S3

TB6

R.B

TRANSMISSION WIRES DC12V

2
1

12

2
1

TH1

3
2
1

DS

D.SENSOR

CN31

(WHT)

INTAKE

CN20

(RED)

BLK

BLK

BLK
BLK

2
1

TH2

LIQUID

CN21

(WHT)

BLK
BLK

2
1

TH5

PIPE
CN29
(BLK)

BLK
BLK

VANE

CN6V

(WHT)

6
5
4
3
2
1

1
2
3
4
5

MV

BRN
RED
ORN
YLW
GRN

CN2L

See fig :w1

SW1SWE

ON
OFF

SW2

J24

J23

J22

J21

J15

J14

J13

J12

J11

3

1

1

3

5

DP

X1

X1

D.U.M

CNP

(YLW)

POWER

CN03

(RED)

FUSE

ZNR

T

BRN

ORN

YLW

BLU
BLU

TO OUTDOOR UNIT

MODELS

SW1

<w1>

PMH-P25/35/50BA

Manufacture

J11 J12 J13 J14 J15

Service board

SW2

PMH-P25BA

J21 J22 J23 J24

ON
OFF

1234

12345

ON
OFF

PMH-P35BA

J21 J22 J23 J24

ON
OFF

1234

PMH-P50BA

J21 J22 J23 J24

ON
OFF

1234

NOTES:

1.Since the outdoor side electric wiring may change be sure
to check the outdoor unit electric wiring for servicing.

2.Indoor and outdoor connecting wires are made with polarities,
make wiring matching terminal numbers (S1, S2, S3).

3.Symbols used in wiring diagram above are,
: Connector, : Terminal (block).

Please set the voltage using the remote controller.
For the setting method, please refer to the indoor
unit Installation Manual.

SYMBOL

[LEGEND]

I.B INDOOR CONTROLLER BOARD

CN2L CONNECTOR(LOSSNAY)
CN32 CONNECTOR(REMOTE SWITCH)

R.B

WIRED REMOTE CONTROLLER BOARD
DP DRAIN-UP MACHINE
DS DRAIN SENSOR
MF FAN MOTOR
MV
TB4

VANE MOTOR

TERMINAL BLOCK

(INDOOR / OUTDOOR CONNECTING LINE)
TB5,TB6 TERMINAL BLOCK

(REMOTE CONTROL TRANSMISSION LINE)
TH1 ROOM TEMP, THERMISTOR

(0:/15k", 25:/5.4k" DETECT)
TH2 PIPE TEMP, THERMISTOR / LIQUID

(0:/15k", 25:/5.4k" DETECT)
TH5 COND, / EVA, TEMP, THERMISTOR

(0:/15k", 25:/5.4k" DETECT)

CN41 CONNECTOR(HA TERMINAL-A)
FUSE FUSE(6.3A , 250V)
LED1 POWER SUPPLY(I.B)
LED2 POWER SUPPLY(R.B)
LED3 TRANSMISSION(INDOOR-OUTDOOR)
SW1 JUMPER WIRE(MODEL SELECTION)
SW2 JUMPER WIRE(CAPACITY CORD)
SWE SWITCH(EMERGENCY OPERATION)
T TRANSFORMER
X1 RELAY(DRAIN PUMP)
ZNR VARISTOR

NAME

7

WIRING DIAGRAM

PMH-P25BA
PMH-P35BA
PMH-P50BA

9

Pipe temperature
thermistor/liquid
(TH2)

Distributor
with strainer
#50

Condenser/evaporator
temperature thermistor
(TH5)

Room temperature
thermistor (TH1)

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer
#50

Strainer
#50

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

8

REFRIGERANT SYSTEM DIAGRAM

PMH-P25BA
PMH-P35BA
PMH-P50BA

Unit : mm

10

9 TROUBLESHOOTING

Unit conditions at service

Error code

Actions to be taken for service (summary)

The inferior phenomenon is
reoccurring.

Displayed

Not displayed

Judge what is wrong and take a corrective action
according to “SELF-DIAGNOSIS ACTION TABLE” (9-2).

Identify the cause of the inferior phenomenon and take
a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (9-3).

The inferior phenomenon is
not reoccurring.

Logged

Not logged

1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
inferior phenomenon occurred, and wiring related.
2Reset error code logs and restart the unit after finishing
service.
3There is no abnormality in electrical components,
controller boards, and remote controller.

1Recheck the abnormal symptom.
2Identify the cause of the inferior phenomenon and take

a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (9-3).
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality in electrical components,
controller boards, remote controller etc.

9-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service and the inferior phenomenon reoccurrence at field are summarized in the table below. Check
the contents below before investigating details.

11

9-2. SELF-DIAGNOSIS ACTION TABLE

Error Code

P1

P2

Meaning of error code and detection method
Abnormality of room temperature

thermistor (TH1)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating operation.
Short: 90: or more
Open: -40: or less

Abnormality of pipe temperature
thermistor/Liquid (TH2)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating (except defrosting)
operation.
Short: 90: or more
Open: -40: or less

Note: Refer to the manual of outdoor unit for the details of display

such as F, U, and other E.

Cause

1 Defective thermistor

characteristics.

2 Contact failure of connector

(CN20) on the indoor controller
board. (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring.

4 Defective indoor controller

board.

1 Defective thermistor

characteristics.

2 Contact failure of connector

(CN21) on the indoor controller
board. (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring.

4 Defective refrigerant circuit is

causing thermistor temperature
of 90: or more or -40: or
less.

5 Defective indoor controller board.

Countermeasure

1–3 Check resistance value of thermistor.
0: ······15.0k"
10: ····9.6k"
20: ····6.3k"
30: ····4.3k"
40: ····3.0k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor
breaking of wire or contact failure can be
detected.
2 Check contact failure of connector (CN20) on

the indoor controller board. Refer to 9-6.
Turn the power on again and check restart
after inserting connector again.

4 Check room temperature display on remote

controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.

Turn the power off, and on again to operate
after check.

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN21) on

the indoor controller board. Refer to 9-6. Turn
the power on and check restart after inserting
connector again.

4 Check pipe <liquid> temperature with remote

controller in test run mode. If pipe <liquid>
temperature is exclusively low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defective.

5 Check pipe <liquid> temperature with remote

controller in test run mode. If there is exclusive
difference with actual pipe <liquid> temperature,
replace indoor controller board.

P4

P5

Abnormality of drain sensor (DS)

1 Suspensive abnormality, if short/open of

thermistor is detected for 30 seconds
continuously.
Turn off compressor and indoor fan.

2 Short/open is detected for 30 seconds

continuously during suspensive
abnormality.
(The unit returns to normal operation,

if it has normally reset.)

3 Detect the following condition.

• During cooling and drying operation.

• In case that pipe <liquid> temperature

- room temperature <-10deg

(Except defrosting)

• When pipe <liquid> temperature or
room temperature is short/open
temperature.

• During drain pomp operation.

Malfunction of drain pump (DP)

1 Suspensive abnormality, if thermistor

of drain sensor is let heat itself and
temperature rises slightly. Turn off
compressor and indoor fan.

2 Drain pomp is abnormal if the condition

above is detected during suspensive
abnormality.

3 Constantly detected during drain pomp

operation.

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN31) on the indoor controller
board. (Insert failure).

3 Breaking of wire or contact

failure of drain sensor wiring.

4 Defective indoor controller board.

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe

3 Attached drop of water at the

drain sensor

• Drops of drain trickles from
lead wire.

• Clogged filter is causing
wave of drain.

4 Defective indoor controller board.

Turn the power off, and on again to operate
after check.

1–3 Check resistance value of thermistor.
0: ······6.0k"
10: ····3.9k"
20: ····2.6k"
30: ····1.8k"
40: ····1.3k"
2 Check contact failure of connector (CN31) on

the indoor controller board. Refer to 9-6. Turn
the power on again and check restart after
inserting connector again.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited,
and abnormality reappears.

Turn the power off, and on again to operate
after check.

1 Check if drain-up machine works.
2 Check drain function.
3 Check the setting of lead wire of drain sensor

and check clogs of the filter.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited
and abnormality reappears.
Refer to 9-6.

Turn the power off, and on again to operate
after check.

12

Error Code

P6

Meaning of error code and detection method
Freezing/overheating protection is

working

1 Freezing protection (Cooling mode)

The unit is in six-minute resume prevention
mode if pipe <liquid or condenser/evap­orator> temperature stays under

-15: for three minutes, three minutes
after the compressor started. Abnormal
if it stays under -15: for three minutes
again within 16 minutes after six-minute
resume prevention mode.

<Frost prevention mode>
If pipe <liquid or condenser-evaporator>
temperature is 2: or below when 16
minutes has passed after compressor
starts operating, unit will start operating
in frost prevention mode which stops
compressor operation. After that, when
pipe <liquid or condenser/evaporator>
temperature stays 10: or more for 3
minutes, frost prevention mode will be
released and compressor will restart its
operation.

2 Overheating protection (Heating mode)

The units is in six-minute resume

prevention mode if pipe <condenser /
evaporator> temperature is detected as
over 70: after the compressor started.
Abnormal if the temperature of over
70: is detected again within 10 minutes
after six-minute resume prevention
mode.

(Cooling or drying mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(Heating mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

8 Bypass circuit of outdoor unit

Cause

operation beyond the tolerance
range

defective.

(clogs)

operation beyond the tolerance
range

defective.

(clogs)
is defective.

Countermeasure

(Cooling or drying mode)

1 Check clogs of the filter.
2 Remove shields.

4 Refer to 9-5.

5 Check outdoor fan motor.
67 Check operating condition of refrigerant

circuit.

(Heating mode)

1 Check clogs of the filter.
2 Remove shields.

4 Refer to 9-5.

5 Check outdoor fan motor.
6~8 Check operating condition of refrigerant

circuit.

P8

Abnormality of pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes later of compressor start and 6 min­utes later of the liquid or condenser/evapo­rator pipe is out of cooling range.
Note 1) It takes at least 9 min. to detect.
Note 2) Abnormality P8 is not detected in

drying mode.
Cooling range : -3 deg ] (TH-TH1)
TH: Lower temperature between: liquid

pipe temperature (TH2) and con­denser/evaporator temperature (TH5)

TH1: Intake temperature
<Heating mode>

When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when
condenser/evaporator pipe temperature is
not in heating range within 20 minutes.

Note 3) It takes at least 27 minutes to

detect abnormality.
Note 4) It excludes the period of defrosting

(Detection restarts when defrosting

mode is over)
Heating range : 3 deg [ (TH5-TH1)

1 Slight temperature difference

between indoor room
temperature and pipe <liquid
or condenser / evaporator>
temperature thermistor

• Shortage of refrigerant

• Disconnected holder of pipe
<liquid or condenser /

evaporator> thermistor

• Defective refrigerant circuit

2 Converse connection of

extension pipe (on plural units
connection)

3 Converse wiring of indoor/

outdoor unit connecting wire
(on plural units connection)

4 Defective detection of indoor

room temperature and pipe
<condenser / evaporator>
temperature thermistor

5 Stop valve is not opened

completely.

1~4 Check pipe <liquid or condenser /

evaporator> temperature with room
temperature display on remote

controller and outdoor controller circuit

board.

Pipe <liquid or condenser / evaporator>
temperature display is indicated by
setting SW2 of outdoor controller circuit
board as follows.

Conduct temperature check with outdoor
controller circuit board after connecting

(

‘A-Control Service Tool(PAC-SK52ST)’.

23Check converse connection of extension

pipe or converse wiring of indoor/outdoor
unit connecting wire.

)

13

Error Code

P9

E0

or

E4

E3

or

E5

Meaning of error code and detection method

Abnormality of pipe temperature ther­mistor / Condenser-Evaporator (TH5)

1 The unit is in three-minute resume pro-

tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three min­utes. (The unit returns to normal opera­tion, if it has normally reset.)

2 Constantly detected during cooling, dry-

ing, and heating operation (except
defrosting)
Short: 90: or more
Open: -40: or less

Remote controller transmission
error(E0)/signal receiving error(E4)

1 Abnormal if main or sub remote con-

troller can not receive normally any
transmission from indoor unit of refriger­ant address “0” for three minutes.
(Error code : E0)

2 Abnormal if sub remote controller could

not receive for any signal for two min­utes. (Error code: E0)

1 Abnormal if indoor controller board can

not receive normally any data from
remote controller board or from other
indoor controller board for three minutes.
(Error code: E4)

2 Indoor controller board cannot receive

any signal from remote controller for two
minutes. (Error code: E4)

Remote controller transmission
error(E3)/signal receiving error(E5)

1 Abnormal if remote controller could not

find blank of transmission path for six
seconds and could not transmit.

(Error code: E3)

2 Remote controller receives transmitted

data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E3)

1 Abnormal if indoor controller board could

not find blank of transmission path.

(Error code: E5)

2 Indoor controller board receives trans-

mitted data at the same time, compares
the data,and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E5)

1 Defective thermistor
2 Contact failure of connector

3 Breaking of wire or contact
4 Temperature of thermistor is

5 Defective indoor controller

1 Contact failure at transmission
2 All remote controllers are set

3 Mis-wiring of remote controller.
4 Defective transmitting receiving

5 Defective transmitting receiving

6 Noise has entered into the

1 Two remote controller are set

2 Remote controller is connected
3 Repetition of refrigerant
4 Defective transmitting receiving
5 Defective transmitting receiving

6 Noise has entered into trans-

Cause

characteristics
(CN29) on the indoor controller

board. (Insert failure)
failure of thermistor wiring.
90: or more or -40: or less

caused by defective refrigerant
circuit.

board.

wire of remote controller
as “sub” remote controller. In

this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.

circuit of remote controller
circuit of indoor controller board

of refrigerant address “0”.
transmission wire of remote

controller.

as “main.”
(In case of 2 remote con-

trollers)
with two indoor units or more.
address.
circuit of remote controller.
circuit of indoor controller

board.
mission wire of remote con-

troller.

Countermeasure

1–3 Check resistance value of thermistor.

For characteristics, refer to (P1) above.

2 Check contact failure of connector (CN29)

on the indoor controller board.
Refer to 9-6.
Turn the power on and check restart after
inserting connector again.

4 Operate in test run mode and check pipe

<condenser / evaporator> temperature with
outdoor controller circuit board. If pipe
<condenser / evaporator> temperature is
exclusively low (in cooling mode) or high (in
heating mode), refrigerant circuit may have
defective.

5 Operate in test run mode and check pipe

<condenser / evaporator> temperature with
outdoor control circuit board. If there is
exclusive difference with actual pipe
<condenser / evaporator> temperature
replace indoor controller board.
There is no abnormality if none of above
comes within the unit.
Turn the power off and on again to operate.

In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service

(

tool (PAC-SK52ST).

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.

2 Set one of the remote controllers “main”.

If there is no problem with the action above.

3 Check wiring of remote controller.

• Total wiring length: max.500m
(Do not use cablex 3 or more)

• The number of connecting indoor units:
max.16units

• The number of connecting remote con­troller: max.2units

When it is not the above-mentioned problem of

1~3
4 Diagnose remote controllers.

a) When “RC OK” is displayed,

Remote controllers have no problem.
Put the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.

b) When “RC NG” is displayed,

Replace remote controller.
c) When “RC E3” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)→Noise may be causing abnormality. ]

∗ If the unit is not normal after replacing

indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.
4~6 Diagnose remote controller.

a) When “RC OK”is displayed, remote con-

trollers have no problem.
Put the power off,and on again to check.
When becoming abnormal again, replace

indoor controller board.

b)When “RC NG”is displayed, replace

remote controller.

c)When “RC E3”or “ERC 00-66”is displayed,

noise may be causing abnormality.

)

14

Error Code

E6

E7

E1

or

E2

Meaning of error code and detection method

Indoor/outdoor unit communication
error (Signal receiving error)

1 Abnormal if indoor controller board

cannot receive any signal normally for
six minutes after putting the power on.

2 Abnormal if indoor controller board

cannot receive any signal normally for
three minutes.

3 Consider the unit abnormal under the

following condition: When two or more
indoor units are connected to one
outdoor unit, indoor controller board
cannot receive a signal for three minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.

Indoor/outdoor unit communication
error (Transmitting error)

Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

Abnormality of remote controller con­trol board

1 Abnormal if data cannot be normally

read from the nonvolatile memory of the
remote controller control board.

(Error code: E1)

2 Abnormal if the clock function of remote

controller cannot be normally operated.

(Error code: E2)

1 Contact failure, short circuit or,

2 Defective transmitting receiving
3 Defective transmitting receiving
4 Noise has entered into indoor/

1 Defective transmitting receiving
2 Noise has entered into power
3 Noise has entered into outdoor

1 Defective remote controller. 1 Replace remote controller.

Cause

mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire

circuit of indoor controller board
circuit of indoor controller board
outdoor unit connecting wire.

circuit of indoor controller board
supply.
control wire.

Countermeasure

∗ Check LED display on the outdoor control cir-

cuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor unit or
outdoor unit.

Check all the units in case of twin triple
indoor unit system.

2-4 Turn the power off, and on again to

check. If abnormality generates again,
replace indoor controller board or outdoor
controller circuit board.

∗ Other indoor controller board may have

defective in case of twin triple indoor unit
system.

1-3 Turn the power off, and on again to

check. If abnormality generates again,
replace indoor controller board.

15

9-3. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote

controller.

Phenomena

(1)LED2 on indoor controller board

is off.

• When LED1 on indoor controller board is also off.

1 Power supply of 220~240V is not supplied to outdoor

unit.

2 Defective outdoor controller circuit board.

3 Power supply of 220~240V is not supplied to indoor

unit.

4 Defective indoor controller board.

• When LED1 on indoor controller board is lit.

1 Mis-setting of refrigerant address for outdoor unit

(There is no unit corresponding to refrigerant
address “0”.)

Factor

Countermeasure

1 Check the voltage of outdoor power

supply terminal block (L, N)

• When AC 220~240V is not detected.
Check the power wiring to outdoor unit
and the breaker.

• When AC 220~240V is detected.

—Check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 220~240V is not detected.

Check the fuse on outdoor controller
circuit board (10A).

Check the wiring connection.

• When AC 220~240V is detected.

—Check 3 (below).

3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 220~240V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.

• When AC 220~240V is detected.

—Check 4 (below).

4 If no problems are found(1~3), indoor

controller board is defective.

1 Reconfirm the setting of refrigerant

address for outdoor unit
Set the refrigerant address to “0”.
(For grouping control system under
which 2 or more outdoor units are
connected, set one of the units to “0”.)
Set refrigerant address using SW1
on outdoor controller circuit board.

(2)LED2 on indoor controller board

is blinking.

(3)Upward/downward vane perfor-

mance failure

• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire

• When LED1 is lit.

Mis-wiring of remote controller wires
Under twin triple indoor unit system, 2 or more indoor
units are wired together.

1 Refrigerant address for outdoor unit is wrong or not

set.
Under grouping control system, there are some units
whose refrigerant address is 0.

2 Short-cut of remote controller wires
3 Defective remote controller

1 The vane is not downward during defrosting and

heat preparation and when the thermostat is OFF in
HEAT mode. (Working of COOL protection function)

2 Vane motor does not rotate.

• Defective vane motor

• Breaking of wire or connection failure of connector

3 Upward/downward vane does not work.

• The vane is set to fixed position.

Check indoor/outdoor unit connecting wire
for connection failure. Check the connection
of remote controller wires in case of twin
triple indoor unit system. When 2 or more
indoor units are wired in one refrigerant
system, connect remote controller wires to
one of those units.
1 Check the setting of refrigerant address

in case of grouping control system.
If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 on outdoor
controller circuit board.

23 Remove remote controller wires and

check LED2 on indoor controller board.

• When LED2 is blinking, check the
short-cut of remote controller wires.

• When LED2 is lit, connect remote
controller wires again and:

if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.

1 Normal operation (The vane is set to hor-

izontal regardless of remote control.)

2 Check 2 (left).

• Check the vane motor. (Refer to “How
to check the parts”.)

• Check for breaking of wire or connec­tion failure of connector.

3 Normal operation (Each connector on

vane motor side is disconnected.)

16

9-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICRO COMPUTE TROUBLES

Parts name Check points

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

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20:~30:)

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

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20:~30:)

Vane motor

Drain-up
mechanism

Drain sensor

(Refer to <Thermistor Characteristic graph> in detail.)

(Refer to <Thermistor Characteristic graph> in detail.)

Room temperature
thermistor (TH1)

Pipe temperature
thermistor (TH2)

Condenser/evaporator
temperature thermistor
(TH5)

1
3

Blue

Blue

1
2
3

Normal

4.3k"~9.6k"

Abnormal

Open or short

Abnormal

Open or short

Normal

0.6k"~6.0k"

NormalConnector Abnormal

380" i7% Open or short

Normal Abnormal

400"~480" Open or short

MV

Orange

Red

Brown

Brown — Yellow
Brown — Red
Brown — Orange
Brown — Green

Green

Yellow

31

5

4

2

1. If there is not any other wrong when trouble occurs, emergency operation starts as the indoor controller board switch (SWE)
is set to ON.

During the emergency operation the indoor unit is as follows;
(1) Indoor fan high speed operation (2) Drain-up machine operation

2. When emergency operating for COOL or HEAT, setting of the switch (SWE) in the indoor controller board and outdoor unit

emergency operation are necessary.

3. Check items and notices as the emergency operation
(1) Emergency operation cannot be used as follows;

• When the outdoor unit is something wrong.

• When the indoor fan is something wrong.

• When drain over flow protected operation is detected during self-diagnosis. (Error code : P5)

(2) Emergency operation will be serial operation by the power supply ON/OFF.

ON/OFF or temperature, etc. adjustment is not operated by the remote controller.

(3) Do not operate for a long time as cold air is blown when the outdoor unit starts defrosting operation during heat emer-

gency operation.
(4) Cool emergency operation must be within 10 hours. Otherwise, heat exchanger of indoor unit may get frosted.
(5) After completing the emergency operation, return the switch setting, etc. in former state.
(6) Since vane does not work at emergency operation, position the vane slowly by hand.

9-5. HOW TO CHECK THE PARTS
PMH-P25BA
PMH-P35BA
PMH-P50BA

17

Notes

· High voltage is applied to the connecter (FAN) for the fan motor. Give attention to the service.

· Do not pull out the connector (Fan) for the motor with the power supply on.
(It causes trouble of the control

p.c.board)

Self check
Conditions : The indoor fan cannot turn around.

No

Wiring contact check
Contact of fan motor connector (FAN)
Contact of power supply cable.

Fan motor check
Measure the resistance between the fan motor connecter 1(+) and 3( ).
(With the connecter is pulled out from the

p.c.board)

Power supply check
Check the voltage in the indoor control

p.c.board

Approx. 310~340V between the connecter (FAN) 1(+) and 3( ).
Approx. 1~3V between the connecter (FAN) 5(+) and 3( ).
The voltage between the 5 and 3 is a value during the fan motor operation.
In the case that the fan motor off, the voltage is 0V.

Fan motor position sensor signal check
Turn around the fan motor more than one revolution slowly, and check
the voltage between the connecter (FAN) 6(+) and 3( ).

Check method of indoor fan motor (fan motor / control p.c.board)

Wiring recovery

Trouble of the fan motor Replacement of the motor

Is the resistance 1M" or more?

Trouble of the indoor

p.c.board

Replacement of the indoor control

p.c.board

Trouble of the fan motor
Replacement of the motor

Dose the voltage repeat DC0V and DC15V?

Replacement of the indoor control

p.c.board

Is the voltage normal?

Was contact caused good?

Yes

1

2

No

Yes

No

Yes

No

Yes

18

<Thermistor Characteristic graph>

-200 20406080

< Thermistor for drain sensor >

Temperature (:)

0

1

2

3

4

5

6

7

8

9

10

Resistance (K")

Thermistor for
lower temperature

Room temperature thermistor(TH1)
Pipe temperature thermistor(TH2)
Condenser/evaporator temperature
thermistor(TH5)

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

Rt=15exp { 3480( ) }

1

273+t

1

273

0: 15kΩ
10: 9.6kΩ
20: 6.3kΩ
25: 5.4kΩ
30: 4.3kΩ
40: 3.0kΩ

Thermistor for
drain sensor

< Thermistor for lower temperature >

50

40

30

20

Resistance (K")

10

0

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

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

Rt=6exp { 3390( ) }

0: 6.0kΩ
10: 3.9kΩ
20: 2.6kΩ
25: 2.2kΩ
30: 1.8kΩ
40: 1.3kΩ

1

273+t

1

273

19

9-6. TEST POINT DIAGRAM
Indoor controller board
PMH-P25BA
PMH-P35BA
PMH-P50BA

FAN
Fan motor output (MF)
Between 1 to 5
220~240V AC

CN03
Connect to the outdoor unit
Between 1 to 3

220~240V AC

Between 3 to 5

0~24V DC

}

CN90
Connect to the wireless
remote controller board

CN32
Connector
(Remote switch)

CN22
Connect to the terminal block (TB5)
(Remote controller connecting wire)
(10~16V DC)

}

+

–

CN31
Drain sensor (DS)

CN20
Room temperature
thermistor (TH1)

CN21
Pipe temperature
thermistor/Liquid (TH2)

CN29
Condenser/Evaporator
temperature thermistor
(TH5)

CN6V
Vane motor output
(MV)

CN41
Connector
(HA terminal-A)

+
–

CNP
Drain-up machine

output (DP)

Between 1 to 3

220~240V AC

Jumper wire J41, J42
Pair number setting with
wireless remote controller

SWE
Emergency
operation

Jumper wire J11~J15
Model setting

CN2L
Connector
(LOSSNAY)

CN25

–

Humidifier output

}

+

(12~16V DC)

Jumper wire J21~J24
Capacity setting

20

9-7. FUNCTIONS OF JUMPER WIRE

J11~J15

(SW1)

Open/short of jumper wire

Functions

Jumper wire

Model
settings

Capacity
settings

Pair number
setting with
wireless
remote
controller

Remarks

J21~J24

(SW2)

J41
J42

0
1
2

3 ~ 9

Wireless remote
controller setting

Control PCB setting

J41 J42

<Settings at time of factory shipment>
Wireless remote controller: 0
Control PCB: (for both J41 and J42)
Four pair number settings are supported.
The pair number settings of the wireless remote
controller and indoor control PCB (J41/J42) are
given in the table on the left.
(' ' in the table indicates the jumper line is disco­nnected.)

(Marks in the table below) Jumper wire ( : Short : Open)
DIP switch ( : ON : OFF)

MODELS

SW1

PMH-P25/35/50BA

Manufacture

J11 J12 J13 J14 J15

Service board

12345

ON
OFF

MODELS Manufacture Service board

SW2

PMH-P25BA

J21 J22 J23 J24

ON
OFF

1234

PMH-P35BA

J21 J22 J23 J24

ON
OFF

1234

PMH-P50BA

J21 J22 J23 J24

ON
OFF

1234

Each function is controlled by the jumper wire on control p.c. board. For service parts, J11- J15 and J21-J24, DIP switches
(SW1 and SW2) are equipped with jumper wire.

21

10

DISASSEMBLY PROCEDURE

PMH-P25BA
PMH-P35BA
PMH-P50BA

Be careful on removing heavy parts.

OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS

1. Removing the intake grille

Opening the air intake grille

(1) Press the of the air intake grille.(See figure 1)
(2) Put your figure on the both end of nut of the air intake grille

and put it down after the grille clicked.

Removing the air intake grille

(1) Press the of air intake grille, and pull down the both

end of nut with your fingers after the grille clicked.
(See figure 1)

(2) Pull out the handle of air intake grille strong toward you.

(See figure 2)

(3) Draw the string of air intake grille to prevent the grille from

dropping.(see figure 3)

PUSH

PUSH

Photo 1

Air filter

Figure 1

Figure 2

Figure 3

22

OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS

2. Removing the electrical parts box

(1) Remove the panel.
(2) Remove the cover.
(3) Remove the electrical parts cover.
(4) Disconnect the connectors of fan motor, vane motor, drain

pump, room temperature thermistor, pipe temperature
thermistor, condenser/evaporator temperature thermistor
and drain sensor on the electrical controller board.

(5) Disconnect the lead wire and earth wire from terminal

block.

(6) Remove the electrical parts box.

3. Removing the stabilizer

Note when the stabilizer is removed

Photo 2

Drain pan

Photo 3

Photo 4

Claw in middle
of stabilizer

Stabilizer

Stabilizer

Heat exchanger

Electrical parts

cover

Electrical parts
cover

• Since the insulation material (white) which prevents
water-drops from putting is mounted to the side of vane
motor, remove the insulation material when the stabilizer
is removed.(See figure 4)

• After completing the service, mount the insulation material
as before as shown in right figure.

• The insulation material consists of soft and hard layers.
Mount the insulation with the hard layer on the stabilizer
side.

(1) Remove the panel.
(2) Remove the room temperature thermistor.
(3) Unhook the claw in the middle of stabilizer and remove

the drain pan. (5 screws) (See photo 2)
(4) Remove the stabilizer side of the heat exchanger. (2 screws)
(5) Remove the cover.
(6) Remove the electrical parts cover.
(7) Disconnect the connector of vane motor.
(8) Remove the insulation material (white) on the right side of

stabilizer.
(9)Remove the stabilizer. (6 screws)

4. Removing the vane motor

(1) Remove the stabilizer. Refer to above-mentioned (3)

Removing the stabilizer.
(2) Remove the vane motor.

Figure 4

Stabilizer

Photo 5

Room temperature thermistor

Hard material

Insulation material

Vane motor

Soft material

Vane motor

23

OPERATING PROCEDURE PHOTOS&ILLUSTRATIONS

5. Removing the drain pump

(1) Remove the panel.
(2) Unhook the claw in the middle of stabilizer and remove

the drain pan.
(3) Remove the cover.
(4) Remove the electrical parts cover.
(5) Disconnect the connector of drain pump.
(6) Remove the drain hose.
(7) Remove the drain pump.(2 screws)

6. Removing the fan motor and line flow fan

(1) Remove the panel.
(2) Unhook the claw in the middle of stabilizer and remove

the drain pan.
(3) Remove 2 screws at the stabilizer side of the heat

exchanger
(4) Remove the cover.
(5) Remove the electrical parts cover.
(6) Disconnect the connectors of vane motor, fan motor and

drain pump.
(7) Remove the stabilizer side of the heat exchanger. (2 screws)
(8) Remove the stabilizer.
(9) Remove the drain pump.

(10) Remove 2 screws in the motor support.
(11) Remove the fan motor and line flow fan (The fan motor

and line flow fan can be removed without removing the

heat exchanger.)

Photo 6

Photo 7

Drain sensor

Line flow fan

Drain pump

Fan motor

Fan motor

7. Removing the thermistor<Room temperature thermistor>

(1) Remove the panel.
(2) Bring down the electrical parts box and remove the cover.
(3) Remove the thermistor <Room temperature thermistor>
(4) Disconnect the lead wire from the cord clamp (5 points)
(5) Disconnect the connector (CN20) on the indoor controller

board.

8. Removing the thermistor<Pipe temperature thermistor/liquid>
<Condenser/evaporator temperature thermistor>

(1) Remove the panel.
(2) Bring down the electrical parts box and remove the cover.
(3) Remove the drain pan.
(4) Remove the thermistor <Pipe temperature thermistor/liquid>

/<Condenser/evaporator temperature thermistor>.
(5) Disconnect the lead wire from the cord clamp
(6) Disconnect the connector (CN29)/(CN21) on the indoor

controller board.

24

11

1
2
3
4
5
6
7
8

9
10
11
12
13
14

1
2
2
2
2
1
1
1
2
1
2
1
1
1

(DT88D360H03)

AIR OUTLET GRILLE
LATCH
HANGER
PANEL HOOK
GRILLE CATCH
LL.FILTER
LL.FILTER
INTAKE GRILLE
GRILLE CATCH
RECEIVER COVER
MAGNET
SCREW CAP
REMOTE CONTROLLER
REMOTE CONTROLLER CABLE

No. Part No. Part Name

Specification

Q'ty/set

Price

Unit

Amount

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom­mended

Q'ty

PMH-P25/35/50BA

T7W E11 003
R01 E00 055

—
R01 E00 099
R01 E01 054
R01 E01 500
R01 E02 500
T7W E01 691
R01 E00 054
R01 E00 648
R01 E00 044
R01 E00 096
T7W E08 713
T7W E01 305

ON/OFF

TEMP.

PARTS LIST

PANEL PARTS
PMH-P25BA
PMH-P35BA
PMH-P50BA

11

12

11

2

1

3

4

5

2

3

4

10

5

6

9

13

7

8

25

14

FUNCTIONAL 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

25

1
1
1
1
1
1
1

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

1
1
1
1
1
1
1

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

PMH-P·BA

TH1

TH2
TH5

MV

DS
DP

MF

(DT00A478G81)
(RG02L277H02)

(RG00L311G19)

CABINET
COVER
BEARING MOUNT
SLEEVE BEARING
LINE FLOW FAN
STABILIZER ASSY
VANE SLEEVE
HEAT EXCHANGER
HEAT EXCHANGER
DRAIN PAN
ROOM TEMPERATURE THERMISTOR
GUIDE VANE
PIPE TEMPERATURE THERMISTOR / LIQUID

CONDENSER / EVAPORATOR TEMPERATURE THERMISTOR

VANE
VANE MOTOR
CASING
SENSOR HOLDER
DRAIN SENSOR
DRAIN PUMP
MOTOR SUPPORT
FAN MOTOR
MOTOR MOUNT
DRAIN PIPE
CONTROL BOX COVER
SCREW ASSY

No.

Part No. Part Name Specification

Q'ty/set Price

Unit

Amount

Remarks

(Drawing No.)

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

35
1
1
1
1
1
1
1
1

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

25 50
—
—

R01 22A 102
R01 005 103
R01 E02 114
T7W E01 079
R01 E00 092
T7W E69 480
T7W E70 480
R01 E10 529
R01 E00 202
R01 E00 038
R01 E41 202
R01 E44 202
R01 E01 002
R01 E01 223
R01 E00 110
R01 31K 241
R01 E01 266
T7W E02 355
R01 E00 130
R01 E14 220
R01 E07 105
R01 E00 527

—

R01 E01 673

PMH-P25BA
PMH-P35BA
PMH-P50BA

24

23

1

2
3

SLEEVE

BEARING

4
5

6

VANE

SLEEVE

7

8

9

TEMPERATURE

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

ROOM

THERMISTOR

10

22
21
20

17

18

19

16

VANE MOTOR

15
14

CONDENSER / EVAPORATOR

13

TEMPERATURE THERMISTOR

PIPE TEMPERATURE

12

THERMISTOR / LIQUID

11

26

ELECTRICAL PARTS
PMH-P25BA
PMH-P35BA
PMH-P50BA

1

2

3

5

4

No. Part No. Part Name

1
2

T7W E13 716

3

T7W 515 716

4

T7W 520 239

5

T7W E26 310

—

CONTROL BOX
TERMINAL BLOCK
TERMINAL BLOCK
FUSE
INDOOR CONTROLLER BOARD

Specification

3P (S1, S2, S3)
2P (1, 2)
250V 6.3A

Q'ty/set

PMH-P25/35/50

BA

1
1
1
1
1

(Drawing No.)

(RG02B337G16)

Remarks

Wiring

Diagram

Symbol

TB4
TB5

FUSE

I.B

Recom­mended

Q'ty

Unit

Price

Amount

27

TM

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

CCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Jul. 2005 No.OC333 PDF 9
Made in Japan.

New publication, effective Jul. 2005.
Specifications subject to change without notice.