Mitsubishi Electric MSC-GA20VB- E1 Manual de usuario

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS ·························7

6. WIRING DIAGRAM ············································8

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

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

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

10. DISASSEMBLY INSTRUCTIONS·····················18

11. PARTS LIST······················································20

12. OPTIONAL PARTS···········································22

Wireless type

Models

MSC-GA20VB - (WH)

MSC-GA25VB - (WH)

MSC-GA35VB - (WH)

MSC-GA20VB -

MSC-GA25VB -

MSC-GA35VB - E1

No. OB385

SPLIT-TYPE, AIR CONDITIONERS

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

Indication of model name

NOTE:

•This manual describes technical data of indoor units.

•As for outdoor units MU-GA20/GA25/GA35VB - , refer to the service manual OB386.

•As for outdoor units MUH-GA20/GA25/GA35VB - , refer to the service manual OB387.

•As for outdoor units MUX-2A28/2A59/3A60/3A63/2A70/4A73VB - , refer to the service manual

OB384.

•As for outdoor units MXZ-A14/A18/A26/A32WV - , refer to the service manual OB319 REVISED

EDITION-A. E1

OB385-1.qxp 05.1.25 18:50 Page 1

OB385-1.qxp 05.1.25 14:50 Page 2

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - E1E1E1

Emergency operation switch

Fan

Catechin air filter

(With deodorizer)

Air outlet

Vertical vanes

Air inlet

to Breaker

Remote control

receiving section

Display section

Air cleaning filter(option)

(white bellows type) Front panel

Power supply cord

Panel

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Operation indicator lamp

Remote control

receiving section

TECHNICAL CHANGES

MSC-A07YV - ➔ MSC-GA20VB -

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

2. P.C. board has been changed.

3. Air cleaning filter has been changed to optional parts.

4. Fan motor has been changed.

5. Fan motor capacitor has been changed.

6. Color of indoor unit has been changed.

MSC-A09YV - ➔ MSC-GA25VB -

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

2. P.C. board has been changed.

3. Air cleaning filter has been changed to optional parts.

4. Fan motor has been changed.

5. Fan motor capacitor has been changed.

6. Color of indoor unit has been changed.

MSC-A12YV - ➔ MSC-GA35VB -

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

2. P.C. board has been changed.

3. Air cleaning filter has been changed to optional parts.

4. Fan motor has been changed.

5. Fan motor capacitor has been changed.

6. Color of indoor unit has been changed.

E1E1

OB385-1.qxp 05.1.26 12:34 Page 3

ACCESSORIES

MSC-GA20VB -

MSC-GA25VB -

MSC-GA35VB - E1

Installation plate

Installation plate fixing screw 4 o25 mm

Remote controller holder

Fixing screw for 33.5 o16 mm

Battery (AAA) for remote controller

Wireless remote controller

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

ON/OFF

FAN

TOO

WARM TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

I FEEL

COOL

DRY

CLOCK

RESET CLOCK

HEAT

/FAN

Open the front lid.

ON/OFF

TOO

COOL

TOO

WARM

Signal transmitting section

Operation display section

OPERATE /STOP

(ON /OFF) button

TEMPERATURE buttons

Indication of remote controller model is

on back.

OPERATION SELECT button

FAN SPEED CONTROL button OFF-TIMER button

HR. button

MIN. button

(TIME SET button)

ON-TIMER button

RESET button

ECONO COOL button

VANE CONTROL button

CLOCK SET button

REMOTE CONTROLLER

OB385-1.qxp 05.1.25 14:50 Page 4

SPECIFICATION

Indoor model

Function

Indoor unit power supply

Air flow(High/Med.

/Low )

Power outlet

Running current

Power input

Power factor

Fan motor current

Model

Winding

resistance(at 20:)

Dimensions WOHOD

Weight

Air direction

Sound level(High/Med. /Low )

Fan speed(High/Med. /Low )

Fan speed regulator

Thermistor RT11(at 25:)

Thermistor RT12(at 25:)

Remote controller model

K/h

rpm

MSC-GA20VB - E1

Single phase

230V,50Hz

0.17

RC4V19-JA

WHT-BLK 283

BLK-RED 188

815O278O244

KP1A

Cooling

474/372 /276

36/31 /25

900/750 /600

Heating

510/420 /342

36/31 /25

950/820 /700

MSC-GA25VB - E1

Single phase

230V,50Hz

0.17

RC4V19-JA

WHT-BLK 283

BLK-RED 188

815O278O244

KP1A

Cooling

474/384 /306

36/31 /25

900/770 /650

Heating

588/456 /342

39/32 /25

1,050/870 /700

MSC-GA35VB - E1

Single phase

230V,50Hz

0.19

RC4V19-HA

WHT-BLK 224

BLK-RED 318

815O278O244

KP1A

Cooling

582/444 /324

40/33 /26

930/760 /600

Heating

606/498 /396

39/33 /26

960/830 /700

Electrical

data

Fan

motor

Special

remarks

Capacity

w w

wwwwwwwwww

wwwwwwwwwww

www wwww wwwww

wwww

NOTE: 1. Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C

Outdoor DB35°C WB24°C Outdoor DB7°C WB6°C

Indoor-Outdoor piping length 5m

WReference value

OB385-1.qxp 05.1.25 18:50 Page 5

NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

APPROXIMATE

TERESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : DB27:WB19:

Heating : DB20:WB -:

MSC-GA20VB- E1 COOLING

High

FUNCTIONFAN SPEED

HEATING

SPL(dB(A)) LINE

10 63 125 250 500 1000 2000 4000 8000

APPROXIMATE

TERESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions.

Cooling : DB27:WB19:

Heating : DB20:WB -:

MSC-GA25VB- E1 COOLING

High

FUNCTIONFAN SPEED

HEATING 39

SPL(dB(A)) LINE

10 63 125 250 500 1000 2000 4000 8000

APPROXIMATE

TERESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions.

Cooling : DB27:WB19:

Heating : DB20:WB -:

MSC-GA35VB- E1 COOLING

FUNCTIONFAN SPEED

HEATING

High 39

SPL(dB(A)) LINE

INDOORUNIT WALL

MICROPHONE

0.8m

OB385-1.qxp 05.1.25 14:50 Page 6

OUTLINES AND DIMENSIONS

MSC-GA20VB -

MSC-GA25VB - E1

INDOOR UNIT

244

242 5

7 or more

110

149

606

278

815

783

Power supply cord

Lead to right 1.0m

Lead to left 0.3m

Air out

Installation plate

Insulation [28

Drain hose [16

(Connected part O,D)

Air in

Liquid line [6.35-0.5m

Gas line [9.52-0.43m

Insulation [37 O.D

[21 I.D

{

Wireless remote controller

162

81.5

2.5

271

231.5

4.5

81.5 133.5

326326

Wall hole [65

Indoor unit

Installation plate

Unit: mm

MSC-GA35VB - E1

INDOOR UNIT

244

242

218.5

258

81.581.5

2.5

17.5

161.5161.5

326326

7 or more

110

149

606

278

815

783

Power supply cord

Lead to right 1.0m

Lead to left 0.3m

Air out

Indoor unit

Installation plate

Wall hole [65

Installation plate

Insulation [28

Drain hose [16

(Connected part O,D)

Liquid line [6.35-0.5m

Gas line [9.52-0.43m

Insulation [37 O.D

[21 I.D

{

Wireless remote controller

162

Air in

OB385-1.qxp 05.1.25 14:50 Page 7

REFRIGERANT SYSTEM DIAGRAM

MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - E1E1E1

INDOOR UNIT

Indoor

heat

exchanger

Room temperature

thermistor

RT11

Refrigerant pipe [9.52

(with heat insulator) Unit:mm

Indoor coil

thermistor

RT12

Flared connection

WIRING DIAGRAM

MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - E1E1E1

MODELS WIRING DIAGRAM

SYMBOL

NR11

RT11

RT12

SR141

NAME NAME NAME

INDOOR FAN CAPACITOR

FUSE(3.15A)

INDOOR FAN MOTOR (INNER FUSE)

VANE MOTOR

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

SYMBOL

C11

F11

SYMBOL

T11 TRANSFORMER

125

CNCN

109

REMOTE

CONTROLLER

POWER MONITOR

RECEIVER P.C.BOARD

GRN

LD103

12V

FOR

MU OR

MUX TYPE

FOR MUH OR

MXZ-A TYPE

GRN/YLW

POWER

SUPPLY

CORD

~/N 230V

50Hz

TO OUTDOOR

UNIT

CONNECTING

12V

LBRN

BLU

BLK

WHT

BLU

RED

BRN

151

CN202

CN201

LD105

CN211

ELECTRONIC CONTROL P.C. BOARD

F11

T11

NR11

RT11

RT12

112

111

121

BLK

GRY

YLW

BRN

WHT

RED

C11

SR141

CIRCUIT BREAKER

INDOOR UNIT

NOTE: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

Refrigerant pipe [6.35

(with heat insulator)

Refrigerant flow

in cooling

OB385-1.qxp 05.1.25 14:50 Page 8

SERVICE FUNCTIONS

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.

8-1. TIMER SHORT MODE

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

The time will be shortened as follows. (Refer to 9-6.)

Set time : 1 minute ➔ 1-second

Set time : 3 minutes ➔ 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.)

How to modify the remote controller P.C. board

Remove batteries before modification. The board has a print as shown below :

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.

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

Solder J2

–

4 units operation

Same as at left

Solder both J1 and J2

MSC-GA20VB -

MSC-GA25VB -

MSC-GA35VB - E1

Remote controller model : KP1A 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.

Slide switch Type

The position

of the slide

switch

COOL ONLYCOOL & HEAT

8-3. REMOTE CONTROLLER (How to set the type)

This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL

ONLY).

If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to the

type of air conditioner. If not, correct the setting as shown below.

OB385-1.qxp 05.1.25 14:50 Page 9

NOTE

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

•If main power is cut 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 appliance 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 system that allows the units to start one by one.

1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER

The indoor units for MU & MUX type and MUH & MXZ type

are common specifications. Set switch according to the

type of outdoor unit. The units are set for

MUH & MXZ type when they are shipped from the factory.

How to release “AUTO RESTART FUNCTION”

! Turn off the main power for the unit.

@ Pull out the electronic control P.C. board, and change switch(SW2-1) on the indoor electronic control P.C. board as

following figures.

SW2-1 sets the AUTO RESTART FUNCTION ON / OFF.

SW2-2 switches over the MU & MUX type / MUH & MXZ type.

When the units are shipped from the factory, SW2 is as follows.

SW2-1:AUTO RESTART FUNCTION ON

SW2-2:MUH & MXZ type

}

SW2

FRONT

IC101

CN151

SW1

CN112

CN121

L101

CN201

F11

CN202

C11

CN211

SW2

LD105

Operation

! If the main power (230V AC) has been cut, the operation settings remain.

@ 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.)

8-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION

2. 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 CONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the opera-

tion is decided by the initial room temperature. “AUTO RESTART FUNCTION” is ON when the units are shipped from

the factory.

1 2

1 2 SW2 SW2

1 2

Outdoor unit

MUH & MXZ type

Set 2 switch downside.

Outdoor unit

MU & MUX type

Set 2 switch upside.

NOTE:•If the indoor-outdoor connecting wire is incorrectly

connected on the terminal block, the unit does not

operate normally.

•If a ground is incorrect, it may cause an electric shock.

How to switch over MU & MUX TYPE / MUH & MXZ TYPE

! Turn off the main power for the unit.

@ Pull out the electronic control P.C. board, and change

switch(SW2-2) on the indoor electronic control P.C. board

according to the type of outdoor unit as following figures.

1 2 SW2 SW2

1 2 1 2

1 2

AUTO RESTART

FUNCTION ON

Set 1 switch downside.

AUTO RESTART

FUNCTION OFF

Set 1 switch upside.

OB385-1.qxp 05.1.25 14:50 Page 10

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