Mitsubishi OB452 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type Models

No. OB452

MSZ-HA25VA MSZ-HA35VA -

Outdoor unit service manual

MUZ-HA·VA Series (OB453)

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················7

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

9. TROUBLESHOOTING······································10

10. DISASSEMBLY INSTRUCTIONS·····················22

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

12. RoHS PARTS LIST···········································28

13. OPTIONAL PARTS ···········································31

NOTE:

This service manual describes technical data of the indoor units. RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List.

Air outlet

Vertical vane

Air inlet

Operation Indicator lamp

Front panel

Air filter (Anti-mold)

Horizontal vane

Remote controller

Remote control receiving section

Emergency operation switch (E.O. SW)

TECHNICAL CHANGES

MSZ-GA25VA - ➔ MSZ-HA25VA -

MSZ-GA35VA - ➔ MSZ-HA35VA -

1. Indoor model has been changed.

PART NAMES AND FUNCTIONS

MSZ-HA25VA MSZ-HA35VA

E1E1

1 2 3 4 5 6

Installation plate Installation plate fixing screw 4 o 25 mm 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 2 2 1 1

MSZ-HA25VA

Time set buttons

RESET button

Vane control button

Signal transmitting section

Operation display section

Temperature buttons

ON/OFF (operate/stop) button

Fan speed control button

Operation select button

Timer mode select button

ECONO COOL button

MSZ-HA35VA

ACCESSORIES

REMOTE CONTROLLER

INDOOR UNIT

Fuse Horizontal vane motor Varistor Terminal block

(F11)

(MV)

(NR11)

(TB)

T3.15AL 250V

12V DC

ERZV14D471

MSZ-HA25VA MSZ-HA35VA

Indoor model

Function

Power supply

Single phase

230V,50Hz

0.22 23

0.22

RCOJ 40-ED

788O295O225

9 4

38/32/26

MP06B

Single phase

230V,50Hz

0.22 23

0.22

RCOJ 40-ED

788O295O225

9 4

38/32/26

MP06B

Cooling

630

558/420/318

1110

1000/800/650

Heating

546

468/390/306

980

870/750/630

Cooling

630

558/420/318

1110

1000/800/650

Heating

660

546/426/306

1150

980/810/630

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

K /h K /h

A A

dB(A) dB(A)

rpm rpm

Electrical

data

Fan motor

Special

remarks

Capacity

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor Dry-bulb temperature 27

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 ✽1 Measured under rated operating frequency.

:Wet-bulb temperature 19:

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

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

COOLING

FUNCTION

43 43

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

INDOORUNIT

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

COOLING

FUNCTION

43 43

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

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

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

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

NOISE CRITERIA CURVES

MSZ-HA25VA

MSZ-HA35VA

60753 128

295

2255

7459

41.5

214

235

253.5

18.5

320335

155 155

21540.5

254.5

5959 225 225

119

137

100

140

Piping

Insulation

[35 O.D

Liquid line

[6.35 - 0.5m (Flared connection [6.35)

Gas line

[9.52 - 0.43m (Flared connection [9.52)

Drain hose

Inslation[28 Connected part [16 O.D

Air in

Air out

Installation plate

Piping

Drain hose

11X26 Oblong hole

Installation plate

Indoor unit

Wall hole [65

788

11X20 Oblong hole

OUTLINES AND DIMENSIONS

MSZ-HA25VA MSZ-HA35VA

Unit : mm

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

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

WIRING DIAGRAM

MSZ-HA25VA MSZ-HA35VA

REFRIGERANT SYSTEM DIAGRAM

MSZ-HA25VA MSZ-HA35VA

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-HA25VA MSZ-HA35VA

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 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.

JR07

Indoor electronic control P.C. board

CN10A CN111CN151 CN112

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.

Insert the minus pole of the batteries first. Check if the polarity of the batteries are correct.

Housing point

TROUBLESHOOTING

MSZ-HA25VA MSZ-HA35VA

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 P.C. board.

3) When removing the 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

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 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 back lid and insert batteries.

Then reattach the back 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.

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