Mitsubishi Electronics MSZ-GA22VA, MSZ-GA25VA, MSZ-GA35VA User Manual 2

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

(WH)

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

No. OB378

Indication of model name

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

NOTE:

This service manual describes technical data of the indoor units.

•As for outdoor units MUZ-GA25VA- , MUZ-GA35VA- , MUZ-GA25VAHand MUZ-GA35VAH- , refer to service manual OB379.

•As for outdoor units MXZ-3A54VA- , MXZ-4A71VA- and MXZ-4A80VA- ,

refer to service manual OB377.

CONTENTS

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

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······································10

10. DISASSEMBLY INSTRUCTIONS·····················24

11. PARTS LIST······················································27

12. OPTIONAL PARTS ···········································30

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TECHNICAL CHANGES

MSZ-A09YV - ➔ MSZ-GA22VA -

MSZ-A09YV - ➔ MSZ-GA25VA MSZ-A12YV - ➔ MSZ-GA35VA -

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

2. Control method between indoor and outdoor has been changed.

3. Power supply method has been changed (change to supply from outdoor unit).

4. Power supply cord has been removed.

5. Indoor electronic control P.C. board has been changed.

6. Position of terminal block has been changed.

7. Indoor fan motor has been changed. ( AC ➔ DC)

8. Indoor heat exchanger has been changed.

9. The horizontal vane motor unit has been changed. An external gear is added to the generalized stepping motor. The unit is structured so that the driving torque and stopping torque would increase.

Generalized stepping motor

NOTE: Do not remove the vane motor from the motor unit.

Do not disassemble the horizontal vane motor unit.

E1E1 E1E1 E1E1

10. Air cleaning filer has been removed (available as an optional part).

11. Signal of remote controller has been changed. ( It is not available for the conventional models.)

12. Symbol on terminal block has been changed (to S1/S2/S3).

Line flow fan

Air outlet Vertical vane

Air inlet

Display section

Front panel

Panel

Heat exchanger

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Remote control receiving section

Catechin air filter

Air cleaning filter (Optional parts,AntiAllergy Enzyme Filter, Blue bellows type)

Emergency operation switch

Fan guard

Operation Indicator lamp

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

ACCESSORIES

1 2 3 4 5 6 7

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

MSZ-GA22VA -

MSZ-GA25VA -

1 5 1 2 2 1 1

MSZ-GA35VA -

INDOOR UNIT

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

Open the front lid.

Signal transmitting section

Operation display section

OPERATE/STOP (ON/OFF) button

Temperature buttons

Indication of remote controller model is on back

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

RESET button

(This diagram shows an overall view.)

OFF-TIMER button

ON-TIMER button

TIME SET buttons FORWARD button BACKWARD button

CLOCK SET button

VANE CONTROL button

T3.15AL 250V

MSBPC20M16 12V DC 250" (at 25˚C)

ERZV14D471

INDOOR UNIT

Item

Model

Fuse Horizontal vane motor Varistor Terminal block

MSZ-GA22VA -

MSZ-GA25VA -

MSZ-GA35VA -

(F11)

(MV)

(NR11)

(TB)

MSZ-GA25VA -

MSZ-GA22VA -

MSZ-GA35VA -

Indoor model

Function

Power supply

Single phase

230V,50Hz

0.25 33 — 57

0.25

RC0J30-CC

780O298O210

9 4

36W/29W/21

4 10 10 10

KM05B

Single phase

230V,50Hz

0.25 33 — 57

0.25

RC0J30-CC

780O298O210

9 4

36W/29W/21

4 10 10 10

KM05B

540

36W/29W/21

1,100

36W/29W/22

Cooling

600

480W/366W/234

1,200

1,000W/800W/580

Heating

630

504W/384W/258

1,250

1,040W/830W/620W

Cooling

600

480W/366W/234

1,200

1,000W/800W/580

Heating

630

504W/384W/258

1,250

1,040W/830W/620

Single phase

230V,50Hz

0.25 33 — 57

0.25

RC0J30-CC

780O298O210

9 4

36W/29W/22

4 10 10 10

KM05B

Cooling

600

480W/366W/246

1,200

1,000W/800W/600

Heating

630

504W/384W/270

1,250

1,040W/830W/640

Air flow(Super High) Air flow(HighW/Med.W/LowW) Power outlet Running current ✽1 Power input ✽1 Auxiliary heater Power factor ✽1 Fan motor current ✽1 Model Dimensions WOHOD Weight Air direction Sound level(Super High) Sound level(HighW/Med.W/LowW) Fan speed(Super High) Fan speed(HighW/Med.W/LowW) Fan speed regulator Thermistor RT11(at25:) Thermistor RT12(at25:) Thermistor RT13(at25:) Remote controller model

K /h K /h

A A

A(kW)

dB(A) dB(A)

rpm rpm

k" k" k"

Electrical

data

Fan motor

Special

remarks

Capacity

MSZ-GA25VA -

MSZ-GA22VA -

MSZ-GA35VA -

Indoor model

Function

Cooling

438W/342W/240

930W/760W/580

Heating

420W/366W/258

900W/800W/620

Cooling

438W/342W/240

930W/760W/580

Heating

420W/366W/258

900W/800W/620

Cooling

600

480W/366W/246

1,200

1,000W/800W/600

Heating

618

504W/390W/270

1,230

1,040W/850W/640

Air flow(Super High) Air flow(HighW/Med.W/LowW) Sound level(Super High) Sound level(HighW/Med.W/LowW) Fan speed(Super High) Fan speed(HighW/Med.W/LowW)

K /h K /h

dB(A) dB(A)

rpm rpm

Special

remarks

Capacity

540

36W/29W/21

1,100

SPECIFICATION

When outdoor unit is MXZ type.

NOTE : Test conditions are based on ISO 5151

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

Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:

Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:

Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:

Refrigerant piping length (one way): 5m w Reference value

✽1 Measured under rated operating frequency.

Specifications and rating conditions of main electric parts

63 125 250 500 1000 2000 4000 8000

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

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

COOLING

FUNCTION

43 43

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:

NOISE CRITERIA CURVES

MSZ-GA22VA MSZ-GA25VA -

E1 E1

MSZ-GA35VA -

Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:

Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:

FAN SPEED

Super High

FUNCTION

COOLING

HEATING

SPL(dB(A))

43 43

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

INDOORUNIT

WALL

0.8m

MICROPHONE

NC-20

OUTLINES AND DIMENSIONS

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

INDOOR UNIT

298

53.5 58

E1 E1 E1

780

11X26 Oblong hole

Installation plate

Indoor unit

102624.5

41.5 215

100

Air out

11X20 Oblong hole

335 320

Air in

210 5

or more7

155 155

Installation plate

106

Unit : mm

14273.5

5555 225 225

234

214

7055

42.5

Wall hole [65

Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [35 O.D

{

[19 I.D

Drain hose [16 (Connected part O.D)

Insulation [28

287.5

159

Required space (Indoor unit)

75 or more

10 or more

75 or more

66 or more

In case of left, left back, or

left under piping (using spacer),

115 or more

SYMBOL

DB111

F11 MF

NR11

SYMBOL

RT11 RT12 RT13

T111

NAME DIODE STACK FUSE (T3.15AL250V) INDOOR FAN MOTOR VANE MOTOR (HORIZONTAL) VARISTOR

NAME ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) TRANSFORMER TERMINAL BLOCK

WIRING DIAGRAM

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

INDOOR UNIT

TO OUTDOOR UNIT CONNECTING

GRN

230V~

12-24V

LD104

151

MODELS WIRING DIAGRAM

S1 S2 S3

1R1

INTERLOCK SWITCH(FAN)

TAB3

BLK BLU

RED

CN201

POWER MONITOR RECEIVER P.C.BOARD

F11

NR11

101(A)

DB111

INDOOR ELECTRONIC CONTROL P.C. BOARD

T111

105(T)

SW P.C. BOARD

112

CN211

111

4 3 2 1

1 2 3 4 5 6

RED

BLK

WHT

YLW

BLU

RT13 RT12

RT11

REFRIGERANT SYSTEM DIAGRAM

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

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 [9.52 (with heat insulator)

Indoor coil

Indoor heat exchanger

thermistor RT12(main)

Flared connection

Indoor coil thermistor RT13(sub)

Room temperature thermistor RT11

Unit : mm

Refrigerant flow in cooling Refrigerant flow in heating

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

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

SERVICE FUNCTIONS

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA -

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 9-7.) 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 : KM05B

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

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 accept 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.

Housing point

JR07

CN151 CN211CN112 CN1R1

8-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the 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.

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.)

How to release “AUTO RESTART FUNCTION”

1Turn off the main power for the unit. 2Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)

NOTE:

• The operation settings are memorized when 10 seconds have passed after the indoor unit 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 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 to the system that allows the units to start one by one.

TROUBLESHOOTING

MSZ-GA22VA - MSZ-GA25VA - MSZ-GA35VA -

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 turn off the unit first with the remote controller, 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

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