Mitsubishi Electric MSH-GA50VB Service manual

OB367-1.qxp 04.10.14 1:20 PM Page 1

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No. OB367

SERVICE MANUAL

Wireless type

Models

MSH-GA50VB -

E1 (WH)

MSH-GA60VB -

E1 (WH)

MSH-GA80VB -

E1 (WH)

Indication of model name

MSH-GA50VB -

MSH-GA60VB -

E1

E1

MSH-GA80VB -

E1

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················2

3. SPECIFICATION·················································4

4. NOISE CRITERIA CURVES ·······························5

5. OUTLINES AND DIMENSIONS ·························6

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM ················8

8. SERVICE FUNCTIONS ······································9

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

10. DISASSEMBLY INSTRUCTIONS·····················19

11. PARTS LIST······················································21

12. OPTIONAL PARTS···········································23

NOTE:

This service manual describes technical data of the indoor units.

As for outdoor units MUH-GA50VB E1 , MUH-GA60VB E1 and MUH-GA80VB E1 , refer to service manual OB368.

OB367-1.qxp 04.10.14 1:20 PM Page 2

1

TECHNICAL CHANGES

MSH-A18WV -

E1

➔ MSH-GA50VB -

E1

MSH-A24WV -

E1

➔ MSH-GA60VB -

E1

MSH-A30WV -

E1

➔ MSH-GA80VB -

E1

1. Model name has been changed.

Indication of capacity has been changed. (BTU ➔ kW)

2. Grille design has been changed.

3. Unit size has been changed.(W 1,100 a o H 325 a o D 227 a ➔ W1,100 a o H 325 a o D 258 a )

2 PART NAMES AND FUNCTIONS

INDOOR UNIT

MSH-GA50VB -

MSH-GA60VB -

E1

E1

MSH-GA80VB -

E1

Air cleaning filter (option)

(White bellows type)

Front panel

Catechin air filter

Vertical vanes

Horizontal vane

Operation section

(When the grille is opened)

Grille

Air inlet

To Breaker

Power supply cord

Remote control receiving section

Remote controller

Display section

Operation indicator lamp

Emergency operation switch

ACCESSORIES

Indoor unit

5

6

7

1

2

3

4

Installation plate

Installation plate fixing screw 4 o

25 mm

Remote controller holder

Fixing screw for 3 o

3.5 o

1.6 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

Felt tape (Used for left or left-rear piping)

2

Remote control receiving section

MSH-GA50VB -

MSH-GA60VB -

MSH-GA80VB -

E1

E1

E1

1

7

1

1

1

2

2

OB367-1.qxp 04.10.14 1:20 PM Page 3

REMOTE CONTROLLER

MSH-GA50VB -

MSH-GA60VB -

E1

E1

MSH-GA80VB -

E1

Signal transmitting section

Operation display section

OPERATE /STOP

(ON /OFF)button

PM

AM

ON/OFF

TOO

WARM

TOO

COOL

TEMPERATURE buttons

Indication of remote controller model is on back.

Open the front lid.

VANE button

(Horizontal vane button)

OPERATION SELECT button

ECONO COOL button

WIDE VANE button

(Vertical vane button)

RESET button

CLOCK

PM

AM

ON/OFF

TOO

WARM

TOO

COOL

FAN STOP

I FEEL COOL

VANE

HEAT DRY

MODE WIDE VANE

START

HR.

ECONO COOL LONG

RESET CLOCK

MIN.

FAN SPEED CONTROL button

OFF-TIMER button

ON-TIMER button

HR. button

MIN. button

(TIME SET button)

CLOCK SET button

LONG button

3

OB367-1.qxp 04.10.14 1:20 PM Page 4

3

SPECIFICATION

Indoor model

Function

Power supply

Capacity

Power outlet

Running current

Power input

Auxiliary heater

Power factor

Fan motor current

Model

Winding resistance(at 20 : )

Dimensions W

O

H

O

D

Weight

Air direction

Fan speed regulator

Thermistor RT11(at 25 : )


Remote controller model

K /h

A

A

W

A(kW)

%

A

" mm kg dB rpm k " k "

MSH-GA50VB -

E1

Cooling Heating

Single phase

230V, 50Hz w

10

0.3

60

—

87

0.30

RC4V32-AA

WHT-BLK 293

BLK-RED 146

1,100 O 325 O 258

16

5 w

3

10

10

KM04A

Indoor model

Function Cooling

MSH-GA80VB -

Power supply

Single phase

230V, 50Hz

Capacity

Power outlet

Running current

Power input

Auxiliary heater

Power factor

Fan motor current

Model

Winding resistance(at 20 : )

Dimensions W

O

H

O

D

Weight

Air direction

K /h

A

A

W

A(kW)

%

A

" mm kg w

10

0.34

69

—

88

0.34

RC4V40-AA

WHT-BLK 138.2

BLK-RED 159.0

1,100 O 325 O 258

16

5

47/42 /37 w dB rpm w

Fan speed regulator




Remote controller model k k k

"

"

"

3

10

10

10

KM04A

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB(24°C)

Indoor-Outdoor piping length : 5m w Reference value

Heating : Indoor DB20°C WB 15.5°C

Outdoor DB 7°C WB 6°C

E1

MSH-GA60VB -

E1

Cooling Heating

Single phase

230V, 50Hz

768/672 /588 w

10

0.3

60

—

87

0.30

RC4V32-AA

WHT-BLK 293

BLK-RED 146

1,100 O 325 O 258

16 w w w

5

3

10

10

KM04A

45/40 /34 w

1,070/920 /780 w

Heating w w

4

OB367-1.qxp 04.10.14 1:20 PM Page 5

4

NOISE CRITERIA CURVES

MSH-GA50VB -

E1

MSH-GA60VB -

E1

FAN SPEED SPL(dB(A))

High 42

LINE FAN SPEED

High

SPL(dB(A))

45

LINE

Test conditions,

Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :

Heating : Dry-bulb temperature 20 : Wet-bulb temperature 15.5

:

90




:

90

80 80

70 70

NC-70 NC-70

60

NC-60

50

NC-50

40

NC-40

30

20

10

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

63 125

NC-20

250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

MSH-GA80VB -

E1

FAN SPEED SPL(dB(A)) LINE

High 47

NC-30




:

90

60

NC-60

50

NC-50

40

NC-40

30

20

10

NC-30

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

63 125

NC-20

250 500 1000 2000 4000 8000


INDOORUNIT

WALL

1m

80

0.8m

70

NC-70

60

NC-60

50

NC-50

40

NC-40

30

20

10

NC-30

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

63 125

NC-20

250 500 1000 2000 4000 8000


5

MICROPHONE

OB367-1.qxp 04.10.14 1:20 PM Page 6

5

OUTLINES AND DIMENSIONS

MSH-GA50VB -

MSH-GA60VB -

E1

E1

MSH-GA80VB -

E1

INDOOR UNIT

Installation plate

98

1068

Indoor unit

173

Unit: mm

1100

56

58

791

19

Wireless remote controller

253

98

Air in

Power supply cord

Lead to right 2.0m

Lead to left 1.0m

Air out

414.5

258

414.5

173

Wall hole [ 75

5

Installation plate

{ Liquid line [ 6.35- 0.5m

Gas line [ 12-0.43m

Insulation [ 50 O.D

[ 32 I.D

for MSH-GA50VB

{ Liquid line [ 9.52- 0.5m

Gas line [ 12-0.43m

Insulation [ 50 O.D

[ 32 I.D

for MSH-GA60/GA80VB

Drain hose [ 16

(Connected part O.D)

Insulation [ 28

6

OB367-1.qxp 04.10.14 1:20 PM Page 7

6

WIRING DIAGRAM

MSH-GA50VB -

E1

MSH-GA60VB -

E1

INDOOR UNIT

MODELS WIRING DIAGRAM

TO OUTDOOR

UNIT

CONNECTING

3

TB

12V

N

RED

BLU

CN201

3

2

1

TAB12

HIC1

NR11

2

1

CN112

CN

121

3

F11 SR141

C11 1

3

4

ELECTRONIC CONTROL

P.C. BOARD

CN211

CN

111

RT12

BLK

GRY

YLW

BRN

WHT

RED

4

5

6

1

2

3

MF

POWER

SUPPLY

CORD

~/N 230V

50Hz

L

BRN

BLU

BRN

CN

151

15

CN

102

CN

101

RT11

3 3

PE

CIRCUIT

BREAKER

MV2 MV2 MV1 DISPLAY

P.C.BOARD

RECEIVER

P.C.BOARD

REMOTE

CONTROLLER

SYMBOL

C11

NAME

INDOOR FAN CAPACITOR

SYMBOL

MV1

NAME

VANE MOTOR (HORIZONTAL)

SYMBOL

RT12

NAME

INDOOR COIL THERMISTOR

SR141 SOLID STATE RELAY F11

HIC1

FUSE (3.15A)

DC/DC CONVERTER

MV2

NR11

VANE MOTOR (VERTICAL)

VARISTOR

MF INDOOR FAN MOTOR (INNER FUSE) RT11 ROOM TEMPERATURE THERMISTOR

NOTES: 1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3.Symbols below indicate.

: Terminal block : Connector

TB TERMINAL BLOCK

MSH-GA80VB -

INDOOR UNIT

E1

TO OUTDOOR

UNIT

CONNECTING

3

TB

12V

N

POWER

SUPPLY

CORD

~/N 230V

50Hz

L

BRN

BLU

MODEL WIRING DIAGRAM

RED

BLU

BRN

CN

151

CN

102

CN201

3

2

1

TAB12

HIC1

NR11

4

3

2

1

CN112

CN

121

CN

101

F11 SR141

C11 1

3

4

ELECTRONIC CONTROL

P.C. BOARD

CN211

CN

111

3

15

3 3

RT13

RT12

BLK

GRY

YLW

BRN

WHT

RED

MF

RT11

PE

CIRCUIT

BREAKER

MV2 MV2 MV1 DISPLAY

P.C.BOARD

RECEIVER

P.C.BOARD

REMOTE

CONTROLLER

SYMBOL

C11

F11

HIC1

MF

MV1

NAME

INDOOR FAN CAPACITOR

FUSE(3.15A)

DC/DC CONVERTER

INDOOR FAN MOTOR(INNER PROTECTOR)

VANE MOTOR(HORIZONTAL)

SYMBOL

MV2

NR11

RT11

RT12

RT13

NAME

VANE MOTOR(VERTICAL)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR (MAIN)

INDOOR COIL THERMISTOR (SUB)

NOTES: 1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3.Symbols below indicate.

: Terminal block : Connector

7

SYMBOL

SR141

NAME

SOLID STATE RELAY

TB TERMINAL BLOCK

OB367-1.qxp 04.10.14 1:20 PM Page 8

7

REFRIGERANT SYSTEM DIAGRAM

MSH-GA50VB -

E1

INDOOR UNIT

Refrigerant pipe [ 12.7

(with heat insulator)

Indoor heat exchanger

Indoor coil thermistor

RT12

Distributor

Flared connection

MSH-GA60VB -

E1

INDOOR UNIT

Unit:mm





RT12

Distributor

Flared connection

Room temperature thermistor

RT11


RT11

Flared connection

Flared connection



MSH-GA80VB -

E1

INDOOR UNIT





RT12(main)


RT13(sub)


RT11

Flared connection

Strainer

#50

Flared connection



8

Refrigerant flow in cooling

Refrigerant flow in heating



OB367-1.qxp 04.10.14 1:20 PM Page 9

8

SERVICE FUNCTIONS

MSH-GA50VB -

E1

MSH-GA60VB -

E1

MSH-GA80VB -

E1

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.

The time will be shortened as follows.

Set time : 1 minute ➔ 1-second

Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.)

8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

Remote controller model : KM04A

NOTE : For remodelling, take out the batteries and press the

OPERATE/STOP(ON/OFF)button twice or 3 times at first.

After finish remodelling, put back the batteries then press the

RESET button.

J1 J2

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.

After modification, press the RESET button.

Table 1

No. 1 unit

No. 2 unit

No. 3 unit

No. 4 unit

1 unit operation

No modification

–

–

–

2 units operation

Same as at left

Solder J1

–

–

3 units operation

Same as at left

Same as at left

Solder J2

–

4 units operation

Same as at left

Same as at left

Same as at left

Solder both J1 and J2

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit.

The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down.

Please conduct the above setting once again after the power has restored.

8-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in “I FEEL CON-

TROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided by the initial room temperature.

9

OB367-1.qxp 04.10.14 1:20 PM Page 10

How to release “AUTO RESTART FUNCTION”

1 Turn off the main power for the unit.

2 Pull out the electronic control P.C. board, the receiver P.C.

board and the display P.C.board. (Refer to page 19.)

3 Solder jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to page 18.)

C11

CN201

TAB12

CN21

1

IC101

IC152

JR07

Operation

1 If the main power has been cut, the operation settings remain.

2 After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes for the compressor to start running.)

NOTE

• The operation settings are memorized when 10 seconds have passed after the remote controller was operated with the remote controller.

• If main power is turned off or a power failure occurs while AUTO START/STOP timer is active ,the timer setting is cancelled.

• If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off.

• To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time.

• When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.

10

OB367-1.qxp 04.10.14 1:20 PM Page 11

9

TROUBLESHOOTING

MSH-GA50VB -

MSH-GA60VB -

E1

E1

MSH-GA80VB -

E1

9-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

(1) Check the power supply voltage.

(2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care the following during servicing.

(1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

(2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.

(3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

(4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring Housing point

3. Troubleshooting procedure

(1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

(2) Before servicing check that the connector and terminal are connected properly.

(3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration.

(4) When troubleshooting, refer to 9-2. and 9-3..

4. How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

1 Remove the front lid and insert batteries.

Then reattach the front lid.

2 Press the RESET button with tip end of ball point pen or the like, and then use the remote controller.

Insert the negative pole of the batteries first.

Check if the polarity of the batteries are correct.

RESET button

NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.

11

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9-2. Instruction of troubleshooting

Start

Indoor unit operates.

Outdoor unit doesn't operate.

Indoor unit operates.

Outdoor unit doesn't operate normally.

Indoor unit doesn't receive the signal from remote controller.

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Outdoor unit operates in only Test Run operation.

Outdoor unit doesn't operate even in

Test Run operation.

Outdoor unit doesn't stop even if indoor unit stops.

Unit doesn't operate normal operation in

COOL or

HEAT mode.

Indoor unit operates, when the EMERGENCY

OPERATION switch is pressed.

Indoor unit doesn't operate, when the

EMERGENCY

OPERATION switch is pressed.

Check room temperature thermistor.

Refer to 9-6.

"Test point diagram and voltage".

Refer to

"Check of outdoor unit".

Refer to

"Check of outdoor unit".

Refer to

"Check of

R.V. coil".

Refer to 9-5.

B

"Check of remote controller and receiver

P.C. board".

1. Check indoor /

outdoor

connecting wire.

2. Refer to 9-5.

C

"Check of indoor

electronic control

P.C. board".

Flash on and off at 0.5second intervals

Cause:

Indoor/

Outdoor unit

• Mis-wiring

2-time flash

Cause:

Indoor unit

• Trouble of

room temp-

erature/

indoor coil

thermistor

3-time flash

Cause:

Indoor unit

• Trouble of

indoor fan

motor

4-time flash

Cause:

Indoor unit

• Trouble of

indoor unit

control

system

6-time flash

Cause:

Outdoor unit

• Trouble of

thermistor

in outdoor

unit

7-time flash

Cause:

Outdoor unit

• Trouble of

outdoor

control

system

10-time flash

Cause:

Outdoor unit

MUH-GA80VB

• Trouble of

low discharge

temperature

protection

Refer to

9-5. D

"How to check mis-wiring

(When outdoor unit doesn't work)".

Check room temperature thermistor and indoor coil thermistor.

Refer to 9-6.

"Test point diagram and voltage".

Refer to

9-5. A

"Check of indoor fan motor".

Replace the indoor electronic control

P.C. board.

As for outdoor unit , refer to service manual OB368.

12

Refer to

"Check of outdoor thermistor".

Replace the deicer

P.C. board.

Refer to

"Check of

LEV".

OB367-1.qxp 04.10.14 1:20 PM Page 13

9-3. Troubleshooting check table

• The following indication applies regardless of shape of the indicator.

Operation Indicator

Lighted

Not lighted

· Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities.

· The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation.

Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.

Self check table

No.

Abnormal point

1

Operation indicator lamp

0.5-second ON

Mis-Wiring

0.5-second OFF


2-time flash

2


2.5-second OFF

3-time flash

3

Indoor fan motor

2.5-second OFF

4

Indoor control system

4-time flash

Symptom

Outdoor unit does not operate.

Detection method


Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation.

Checkpoint

3 minutes after power supply turns ON, when serial signal is not received.

• Refer to 9-5. D "How to check mis-wiring ".

• Refer to the characteristics of main indoor coil thermistor, sub indoor coil thermistor, and room temperature thermistor on page 18.

Indoor fan repeats

12 seconds ON and 3minutes OFF.

When the indoor fan breaks, the fan keeps stopping.

When rotational frequency feedback signal is not emitting during 12-second indoor fan operation.

• Refer to 9-5. A "Check of indoor fan motor".


When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

• Check the indoor electronic control P.C. board.

2.5-second OFF

6-time flash

5

Outdoor thermistor

2.5-second OFF

6

Outdoor control system

7-time flash

2.5-second OFF



<Thermistor short>

Thermistors are abnormal when they short after compressor start-up.

<Thermistor open>

Thermistors are abnormal when they open after compressor start-up.

However, discharge temperature thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start-up.

• Shortage of refrigerant

• Check the deicer P.C.

board.

Refer to "Check of outdoor thermistor". Refer to service

manual OB368.

When it cannot properly read data in the nonvolatile memory of the deicer P.C. board, outdoor unit stops [and restarts 3 minutes later(MUH-GA60VB).]

• Check the deicer P.C. board.

Refer to service manual

OB368.

7

MUH-GA80VB

Low discharge temperature protection

10-time flash

2.5-second OFF


MUH-GA80VB

When discharge temperature has been 50 : or less on cool operation, or has been 49 : or less on heat operation for 20 minutes.

MUH-GA80VB

• Refer to "Check of LEV".

• Check refrigerant circuit and refrigerant amount.

Refer to service manual

OB368.

NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the

OPERATION INDICATOR lamp flashing.

13

OB367-1.qxp 04.10.14 1:20 PM Page 14

9-4. Trouble criterion of main parts

MSH-GA50VB -

E1

MSH-GA60VB -

E1

MSH-GA80VB -

E1

Part name

Room temperature thermistor(RT11)


(RT12(main), RT13(sub))

Check method and criterion

Measure the resistance with a tester.

(Part temperature 10˚C ~ 30˚C)

Normal

8 k " ~ 20 k "

Abnormal

Open or short-circuit

Measure the resistance between the terminals with a tester.

(Part temperature 10˚C ~ 30˚C)

Indoor fan motor(MF)

MSH-GA50/GA60VB

INNER FUSE

145 : CUT OFF

MSH-GA80VB

INNER

PROTECTOR

135 i 5 : OPEN

Color of lead wire

WHT – BLK

BLK – RED

Normal

MSH-GA50/GA60VB

282

141

"

"

~ 305

~ 152

"

"

MSH-GA80VB

132 " ~ 144 "

152 " ~ 166 "

Abnormal


Measure the voltage power ON.

Color of lead wire

BRN – YLW

YLW – GRY

Normal

4.5 ~ 5.5V

(When fan revolved one time)

0V ➔ 5V ➔ 0V

(Approx.)

Abnormal

Remain 0V or 5V

Figure

MSH-GA50/GA60VB

MAIN

AUX

FUSE

MSH-GA80VB

MAIN

AUX.

P

Horizontal vane motor(MV1)

Vertical vane motor(MV2)

Measure the resistance between the terminal with a tester.

(Part temperature 10

°

C ~ 30

°

C)

282

Normal

" ~ 306 "

Abnormal


RED

ROTOR

YLW

BRN

ORN GRN

P :INNER PROTECTOR

14

OB367-1.qxp 04.10.14 1:20 PM Page 15

9-5. Troubleshoot flow

When OPERATION INDICATOR lamp flashes 3-time.

Indoor fan motor doesn’t operate.

A Check of indoor fan motor

Turn OFF the power supply.

Check connector CN211 visually.

No

Are lead wires connected?

Yes

Is soldered point of the connector correctly soldered?

Yes

Reconnect the lead wires.

Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.

Measure resistance between lead wires No.3 and No.4 and then No.1 and No.4.

No

Resolder it.

Is resistance 0 (short circuit) or

∞

(open circuit)?

Yes ( 0 or

∞

)

No

(others)

Turn ON the power supply. Stop it if the unit operate.

Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over, and measure voltage between No.2(+) and No.3(-) on CN121.

Repair or replace the indoor fan motor.

No

Does voltage repeat 0V DC and 5V DC?

Yes

Replace the indoor electronic control P.C. board.

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.

B Check of remote controller and receiver P.C. board w Check if the remote controller is exclusive for this air conditioner.

Switch on the remote controller.

Is LCD display on the the remote controller visible?

Yes

Remove the batteries, then set them back and press the RESET button. Check if the unit operates with the remote controller.

No

(not clear)

Replace the batteries.(Refer to page 11.)

Does the unit operate with the remote controller?

Yes

OK

No

Turn on a radio to AM and press switch on the remote controller.

Is noise heard from radio?

Yes

Are there any fluorescent lights of inverter or rapid-start type within the range of 1m?

No

Yes

●

●

Replace the remote controller.

Reinstall the unit away from lights.

Attach a filter on receiving part.

No

Measure the voltage between receiver P.C. board connector CN301 No.1(+) and No.3(-) when the remote controller button is pressed.

Yes

Replace the indoor electronic control P.C.

board.

Is the voltage approx. 4V DC?

No(5V or 0V DC)

Replace the receiver P.C. board.

15

OB367-1.qxp 04.10.14 1:20 PM Page 16

The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

C Check of indoor electronic control P.C. board

Check the both “parts side” and “pattern side” of indoor electronic control P.C. board visually.

Varistor (NR11)


Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Fuse (F11)

Does the unit operate with the remote controller?

Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch?

No

Yes


Replace the vane motor.


Yes

Is winding resistance of vane motor 0 " ?

No

Replace the fuse.

Yes

Is fuse(F11) blown?

No

Is winding resistance of fan motor 0 " ?

Yes

Replace the fan motor.

No

Is varistor(NR11) burnt?

Yes

Replace the varistor.

No

Indoor electronic control P.C. board

Replace the indoor electronic control

P.C. board.

16

OB367-1.qxp 04.10.14 1:20 PM Page 17

When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.

Outdoor unit doesn’t operate.

D How to check mis-wiring w Short circuit of JPG and JPS on the indoor electronic control

P.C. board enables self -check to be displayed in 3 seconds.

Start

• Turn ON the power supply. (indoor/ outdoor unit)

• Press once EMERGENCY OPERATION switch.

After 3 minutes, mis-wiring is indicated

(0.5-second ON, 0.5-second OFF)

on OPERATION INDICATOR lamp on indoor unit.

w

Make them sure.

Yes

Is this mis-wiring, poor contact, or wire disconnection?

No

1. Turn OFF the power supply (indoor/ outdoor unit) and disconnect indoor and outdoor

connecting wire on indoor side.

2. Short-circuit terminal block

N

-

3

by lead wire.

3. Turn ON the power supply (indoor unit) and press once EMERGENCY OPERATION switch.

Is there 20V DC between both ends of

R132 on the indoor electronic control P.C. board ?

( By tester, the stylus is between 0 ~ 20V. )

Yes

• Turn OFF the power supply. (indoor unit)

• Connect ON indoor/ outdoor connecting

wire.

No Replace the indoor electronic control P.C. board.

Turn ON the power supply. (outdoor unit)

Is there 230V AC between L N on the outdoor terminal block?

No Check the outdoor power supply and connection of wiring.

Yes

Is there 5V DC between J205 + -J101 -

(MUH-GA50VB)/ J101 + -J401 - (MUH- GA60

/GA80VB) on the deicer P.C. board?

No

Yes

During EMERGENCY OPERATION, is there

10V DC between both ends of R601 on the deicer P.C. board?

(By tester, the stylus is between 5 ~10V.)

Yes

No

Replace the deicer P.C. board.

Replace the deicer P.C. board.

Make the wiring between CN730 on the deicer P.C. board and outdoor terminal block correct.

As for outdoor unit, refer to service manual OB368.

17

OB367-1.qxp 04.10.14 1:20 PM Page 18

9-6. Test point diagram and voltage

MSH-GA50VB -

E1

MSH-GA60VB -

Indoor electronic control P.C. board

E1

MSH-GA80VB -

E1

Fuse (F11)

250V AC 3.15A

R132

Fan motor power supply

}

Power supply input

230V AC

+

}

5V DC

Room temperature thermistor(RT11)

Indoor coil thermistor(RT12(main))

MSH-GA80VB

Indoor coil thermistor(RT13(sub))

Receiver P.C. board

Release of “Auto restart function”

Solder jumper wire to JR07.

(Refer to page 10.)

Emergency operation switch

Timer short mode point

(JPS, JPG)

(Refer to page 9.)

+

12V DC

Indoor coil thermistor(RT12(main), RT13(sub))

Room temperature thermistor (RT11)

18

OB367-1.qxp 04.10.14 1:20 PM Page 19

10

DISASSEMBLY INSTRUCTIONS

<"Terminal with lock mechanism" Detaching points>

In case of terminal with lock mechanism, detach the terminal as shown below.

There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.

The terminal with no lock mechanism can be removed by pulling it out.

Check the shape of the terminal and work.

(1) Slide the sleeve and check if there is a locking lever or not.

(2) The terminal with this connector is a terminal with lock mechanism

Sleeve

Locking lever

1 Slide the sleeve.

2 Pull the terminal while

pushing the locking

lever.

1 Hold the sleeve, and

pull out the terminal

slowly.

Connector

MSH-GA50VB -

INDOOR UNIT

E1

MSH-GA60VB -

E1

MSH-GA80VB -

OPERATING PROCEDURE

1. Removing the front panel

(1) Remove the screw caps of the front panel.

Remove the screws.

(2) Pull the panel down to your side slightly and unhook the catches at the top.

Photo 1

E1

PHOTOS

Front panel

Screws

2. Removing the electronic control P.C. board, the receiver

P.C. board and the display P.C. board

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

(2) Remove the screw of the electrical cover.

Remove the electrical cover.

(3) Remove the screws of the V.A. clamp.

Remove the V.A. clamp.

(4) Remove the screw of the terminal block.

(5) Remove the screws of the ground wire.

(6) Disconnect all the connectors and all the lead wires on the electronic control P.C. board.

(7) Remove the R.L holder.

(8) Remove the electronic control P.C. board.

(9) Open the R.L holder, remove the receiver P.C. board and the display P.C. board.

Photo 2

Screws of the ground wire

Fan motor connectors

R.L

holder

Screw of the terminal block

Vane motor connector

Indoor electronic control

P.C. board

Screw of the electrical cover

Receiver

P.C.

board

Screw of the

V.A. clamp

19

OB367-1.qxp 04.10.14 1:20 PM Page 20

OPERATING PROCEDURE

3. Removing the electrical box


(2) Remove the electrical cover. (Refer to 2.)

(3) Disconnect the connector of the indoor coil thermistor.

(4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C. board.

(5) Remove the screws of ground wire.

(6) Remove the fan motor lead wire and indoor coil thermistor from the electrical box.

(7) Remove the lead wire of vane motor from the bottom of electrical box.

(8) Remove the screw fixing the electrical box and remove the electrical box.

Photo 3

PHOTOS

Screws of the ground wire

Screw of the electrical cover

Screw of the electrical box

Photo 4

Vane motors

4. Removing the vane motor


(2) Remove the electrical cover. (Refer to 2.)

(3) Remove the lead wire of vane motor. (Refer to 3.)

(4) Remove the R.L. holder.

(5) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.

(6) Remove the screws of the vane motor and disconnect the connector.

(7) Remove the vane motor.

Photo 5 Screws of the vane motor

Screws of the vane motor

Vane motor

5. Removing the line flow fan and the indoor fan motor


(2) Remove the electrical box. (Refer to 3.)

(3) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly.

(4) Remove the water cut.

(5) Slide the hole cover and remove the hole cover.

(6) Remove the hexagon socket set screw from the line flow fan.

(7) Remove the screws fixing the fan motor and remove the fan motor. (Be careful not to drop the fan motor because it is heavy.)

(8) Remove the screws fixing the left side of the heat exchanger.

(9) Lift the left side of the heat exchanger.

(10) Remove the line flow fan.

Photo 8

Hole cover

Photo 6

Screws fixing the left side of the heat exchanger

Photo 7


Water cut

Screws fixing the fan motor

20

OB367-1.qxp 04.10.14 1:20 PM Page 21

11

PARTS LIST

MSH-GA50VB -

E1

(WH)

MSH-GA60VB -

E1

(WH)

MSH-GA80VB -

E1

(WH)

11-1. INDOOR UNIT STRUCTURAL PARTS

1

2

3

4

CATCH

5

SCREW

CAP

11-2. INDOOR UNIT HEAT EXCHANGER

10

8

Optional parts

11

(See page 23.)

12

6

7

11-1. INDOOR UNIT STRUCTURAL PARTS

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

NO.

Part No.

Part Name

7

8

5

6

9

3

4

1

2

E02 527 970

E02 685 234

E02 888 000

E02 408 142

E02 685 067

E02 888 010

E02 534 100

E02 685 975

E02 891 007

INSTALLATION PLATE

BOX (WH)

FRONT PANEL ASSEMBLY(WH)

CATCH

SCREW CAP (WH)

GRILLE (WH)

CATECHIN AIR FILTER

CORNER BOX RIGHT

LAMP PANEL

Symbol in Wiring

Diagram

MSH-GA50

1

4

1

1

3

1

2

1

1

1

4

1

1

3

1

2

1

1

Q'ty/unit

MSH-GA60

VB -

E1

MSH-GA80

(WH)

1

4

1

1

3

1

2

1

1

Remarks

Including No.4,5,6

4PCS/ SET

3PCS/ SET

11-2. INDOOR UNIT HEAT EXCHANGER

10

11

12

E02 891 620

E02 893 620

E02 179 667

E02 138 666

E02 151 667

E02 527 667

INDOOR HEAT EXCHANGER

INDOOR HEAT EXCHANGER

UNION (GAS)

UNION (GAS)

UNION (LIQUID)

UNION (LIQUID)

1

1

1

1

1

1

1

1

1

{ 12.7

{ 15.88

{ 6.35

{ 9.52

21

OB367-1.qxp 04.10.14 1:20 PM Page 22

MSH-GA50VB -

E1

(WH)

MSH-GA60VB -

E1

(WH)

MSH-GA80VB -

E1

(WH)

11-3. INDOOR UNIT FUNCTIONAL PARTS AND

ELECTRICAL PARTS

1

2

3

SLEEVE

BEARING

4

20 19

12

11

18 ROOM

TEMPERATURE

THERMISTOR

5

6

14 13

10

7

11-4. ACCESSORY AND


23 24

FUSE

8 9 VARISTOR 15 16 17

11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

Part numbers that are circled are not shown in the illustration.

NO.

Part No.

3

4

5

1

2

8

9

6

7

10

11

12

13

14

15

16

17

18

19

20

21

22

E02 527 302

E02 408 509

E02 001 504

E02 408 702

E02 527 235

E02 685 040

E02 685 041

E02 127 382

E02 817 385

E02 527 034

E02 817 300

E02 527 300

E02 448 303

E02 408 303

E02 817 333

E02 527 333

E02 528 329

E02 527 468

E02 891 452

E02 892 452

E02 893 452

E02 527 308

E02 819 375

E02 749 307

E02 527 307

E02 528 034

E02 529 034

Part Name

Symbol in Wiring

Diagram

LINE FLOW FAN

BEARING MOUNT

SLEEVE BEARING

DRAIN HOSE

NOZZLE (WH)

VANE UPPER (WH)

VANE LOWER (WH)

FUSE

VARISTOR

VANE CRANK SET

INDOOR FAN MOTOR ASSEMBLY

INDOOR FAN MOTOR ASSEMBLY

VANE MOTOR (VERTICAL)

VANE MOTOR (HORIZONTAL)

MOTOR BAND

MOTOR BAND

DISPLAY P.C. BOARD

RECEIVER P.C. BOARD

ELECTRONIC CONTROL P.C. BOARD



ROOM TEMPERATURE THERMISTOR

TERMINAL BLOCK

INDOOR COIL THERMISTOR

INDOOR COIL THERMISTOR

VANE MOTOR SUPPORT SET(RIGHT)

VANE MOTOR SUPPORT SET(LEFT)

F11

NR11

MF

MF

MV2

MV1

RT11

TB

RT12

RT12, RT13

MSH-GA50

2

1

1

1

1

1

1

1

1

1

1

(WH)

1

1

1

1

1

1

1

1

1

1

1

Q'ty/unit

MSH-GA60

(WH)

1

1

1

1

1

1

1

1

1

1

1

2

1

1

MSH-GA80

(WH)

1

1

1

1

1

1

1

1

1

1

1

2

1

Remarks

3.15A

RC4V32 -

Including RUBBER MOUNT

RC4V40 -

Including RUBBER MOUNT

RIGHT & LEFT

UP & DOWN

1

1

1

1

1

1

AUTO RESTART

Including No.16

AUTO RESTART

Including No.16

AUTO RESTART

Including No.16

1

1

1

1

1

1

1

1

1

1

1

11-4. ACCESSORY AND REMOTE CONTROLLER

23

24

E02 529 426

E02 527 083


REMOTE CONTROLLER HOLDER

22

1

1

1

1

1

1

KM04A

OB367-1.qxp 04.10.14 1:20 PM Page 23

12

OPTIONAL PARTS

AIR CLEANING FILTER

● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible.

● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

● DO NOT reuse AIR CLEANING FILTER even if it is washed.

● DO NOT remove or attach AIR CLEANING FILTER during unit operation.

Part No.

Model

MSH-GA50VB - E1

MSH-GA60VB - E1

MSH-GA80VB - E1

MAC-1700FT

Air cleanig filter (White bellows type)

23

OB367-1.qxp 04.10.14 1:20 PM Page 24

HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN

C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD

Distributed in Oct. 2004. No.OB367 6

Made in Japan

New publication, effective Oct. 2004

Specifications subject to change without notice.

Mitsubishi Electric MSH-GA50VB Service manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

TECHNICAL CHANGES

2 PART NAMES AND FUNCTIONS

SPECIFICATION

NOISE CRITERIA CURVES

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

MODELS WIRING DIAGRAM

MODEL WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

SERVICE FUNCTIONS

TROUBLESHOOTING

+

+

DISASSEMBLY INSTRUCTIONS

<"Terminal with lock mechanism" Detaching points>

PARTS LIST

OPTIONAL PARTS

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