Mitsubishi OB378C Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type Models

Revision C:

• 3.SPECIFICATION has been corrected.

Please void OB378 REVISED EDITION-B.

No. OB378

REVISED EDITION-C

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

Outdoor unit service manual

MUZ-GA·VA Series (OB379) MXZ-A·VA Series (OB377) MXZ-8A140VA1 (OC316)

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. RoHS PARTS LIST···········································31

13. OPTIONAL PARTS ···········································34

NOTE:

RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List.

Revision A:

• MSZ-GA·VA- has been added. Color of BOX and CORNER BOX has been changed to white.

Revision B:

• model has been added.

• Failure mode recall function(9-2.) has been changed.

• RoHS PARTS LIST has been added.

Revision C:

• 3.SPECIFICATION has been corrected. Air flow of indoor units connecting to MXZ-8A140VA

1 has been corrected.

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.

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).

TECHNICAL CHANGES

E1E1 E1E1 E1E1

NOTE:

Do not remove the vane motor from the motor unit. Do not disassemble the horizontal vane motor unit.

Generalized stepping motor

MSZ-GA22VA- ➔ MSZ-GA22VAMSZ-GA25VA- ➔ MSZ-GA25VAMSZ-GA35VA- ➔ MSZ-GA35VA-

1. Color of BOX and CORNER BOX has been changed to white.

MSZ-GA22VA- ➔ MSZ-GA22VAMSZ-GA25VA- ➔ MSZ-GA25VAMSZ-GA35VA- ➔ MSZ-GA35VA-

1. The operation of thermo-off-unit has been changed. (When 2 or more indoor units are connected with a multi type outdoor unit, and operated in heat mode.)

E2E1

< , > Indoor fan operates with very Low speed or stops.

< > Indoor fan operates intermittently with very Low speed or stops.

MSZ-GA25VA- ➔ MSZ-GA25VA-

1. Indoor fan speed has been changed.

E2E1 E2E1 E2E1

E3E2 E3E2 E3E2

E3E2

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

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA

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)

1 5 1 2 2 1 1

MSZ-GA22VA

ON-TIMER button

CLOCK SET button

TIME SET buttons FORWARD button BACKWARD button

OFF-TIMER button

(This diagram shows an overall view.)

Open the front lid.

RESET button

VANE CONTROL button

Signal transmitting section

Operation display section

Temperature buttons

OPERATE/STOP (ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of remote controller model is on back

MSZ-GA25VA MSZ-GA35VA

ACCESSORIES

REMOTE CONTROLLER

T3.15AL 250V

MSBPC20M16 12V DC 250" (at 25˚C)

ERZV14D471

INDOOR UNIT

Item Fuse Horizontal vane motor Varistor Terminal block

(F11)

(MV)

(NR11)

(TB)

MSZ-GA25VA MSZ-GA22VA MSZ-GA35VA

Indoor model

Function

Power supply

Single phase

230V,50Hz

630/504 384/258

0.25 33 57

0.25

RC0J30-CC

780O298O210

9 4

36/29/21

1,250/1,040

830/620

KM05B

Single phase

230V,50Hz

0.25 33 57

0.25

RC0J30-CC

780O298O210

9 4

36/29/21

KM05B

36/29/21

1,100

36/29/22

Cooling

600/480 366/234

1,200/1,000

800/580

486/408 336/258

1,010/880

750/620

Cooling

600/480 366/234

1,200/1,000

800/580

Heating

630/504 384/258

1,250/1,040

830/620

Single phase

230V,50Hz

0.25 33 57

0.25

RC0J30-CC

780O298O210

9 4

36/29/22

KM05B

Cooling

600/480 366/246

1,200/1,000

800/600

Heating

630/504 384/270

1,250/1,040

830/640

Air flow(Super High/High) Air flow(Med./Low) Power outlet Running current ✽1 Power input ✽1 Power factor ✽1 Fan motor current ✽1 Model Dimensions WOHOD Weight Air direction Sound level(Super High) Sound level(High/Med./Low)

Fan speed(Super High/High)

Fan speed(Med./Low) Fan speed regulator

Remote controller model

K /h

A W %

dB(A) dB(A)

rpm

Electrical

data

Fan motor

Special

remarks

Capacity

MSZ-GA25VA MSZ-GA22VA MSZ-GA35VA

Indoor model

Function

Cooling

528

432/336/234

930/760/580

Heating

540

420/366/258

900/800/620

Cooling

528

432/336/234

930/760/580

Heating

540

420/366/258

900/800/620

Cooling

582

468/354/246

1,200

1,000/800/600

Heating

618

504/390/270

1,230

1,040/850/640

Air flow(Super High) Air flow(High/Med./Low) Sound level(Super High) Sound level(High/Med./Low) Fan speed(Super High) Fan speed(High/Med./Low)

K /h K /h

dB(A) dB(A)

rpm rpm

Special

remarks

Capacity

36/29/21

1,100

Heating

1 :

E1 , E2 (serial number : ~ 6024700)

2 :

E2 (serial number : 6024701 ~) , E3

SPECIFICATION

When outdoor unit is MXZ-8A140VA

NOTE : Test conditions are based on ISO 5151

Specifications and rating conditions of main electric parts

Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19: Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15: Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency.

Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24: Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:

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:

INDOOR UNIT

WALL

MICROPHONE

0.8m

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

MSZ-GA35VA

155 155

335 320

41.5 215

42.5

214

287.5

7055

5555 225 225

or more7

100

106

298

102624.5

780

210 5

53.5 19

159

14273.5

234

Air in

Air out

Wall hole [65

Indoor unit

Installation plate

11X20 Oblong hole

11X26 Oblong hole

10 or more

75 or more

66 or more

75 or more

In case of left, left back, or

left under piping (using spacer),

115 or more

Insulation [28

Drain hose [16 (Connected part O.D)

Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [35 O.D [19 I.D

{

Required space (Indoor unit)

OUTLINES AND DIMENSIONS

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA

Unit : mm

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Indoor coil thermistor RT13(sub)

Flared connection

Refrigerant flow in cooling Refrigerant flow in heating

Refrigerant pipe [9.52 (with heat insulator)

Refrigerant pipe [6.35 (with heat insulator)

Indoor coil thermistor RT12(main)

SYMBOL

DB111

F11

MF MV

NR11

SYMBOL

RT11 RT12 RT13

T111

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

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

4 3 2 1

POWER MONITOR RECEIVER P.C.BOARD

230V~

BLU

INDOOR ELECTRONIC CONTROL P.C. BOARD

SW P.C. BOARD

INTERLOCK SWITCH(FAN)

TO OUTDOOR UNIT CONNECTING

BLK

RED

TAB3

DB111

NR11

F11

105(T)

101(A)

12-24V

RT13

1R1

GRN

LD104

CN201

2 1

151

T111

RED

WHT

111

112

CN211

BLU

YLW

BLK

RT11

RT12

1 3 5

WIRING DIAGRAM

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA

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

REFRIGERANT SYSTEM DIAGRAM

MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA

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

3. Symbols below indicate. /: Terminal block, : Connector

Unit : mm

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 :

NOTE : For modification, take out

the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish modification, 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

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”

Turn 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 of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main 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

3. Troubleshooting procedure

RESET button

Insert the negative pole of the batteries first. Check if the polarity of the batteries is correct.

OPERATION INDICATOR

Not lighted

Blinking

Lighted

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 discoloration.

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

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 RESET button with tip end of ball point pen

or the like, and then use the remote controller.

NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.

2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by

the battery replacement.

5. How to install the horizontal vane

If horizontal vane is not installed correctly, all of the operation indicator lamps will blink. In this case, install the horizontal vane correctly by following the procedures 1 to 2.

NOTE: Before installation of the horizontal vane, turn OFF the power supply.

Stopper

Left

In procedure stoppers until they click into place.

Lock.

Insert this end first.

INFORMATION FOR MULTI SYSTEM AIR CONDITIONER

OUTDOOR UNIT : MXZ series

Multi system air conditioner can connect two or more indoor units with one outdoor unit.

•Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity. Operation indicator lamp flashes as shown in the figure below.

•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode.

lock the

•When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.

•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

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