Mitsubishi OB452 Service Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
No. OB452
MSZ-HA25VA MSZ-HA35VA -
E1
E1
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.
1
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.
2
PART NAMES AND FUNCTIONS
MSZ-HA25VA
MSZ-HA35VA
E1E1
E1E1
2
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
3
3
INDOOR UNIT
Fuse
Horizontal vane motor
Varistor
Terminal block
(F11)
(MV)
(NR11)
(TB)
T3.15AL 250V
12V DC
ERZV14D471
3P
MSZ-HA25VA MSZ-HA35VA
Indoor model
Function
Power supply
Single phase
230V,50Hz
10
0.22
23
0.22
RCOJ 40-ED
788O295O225
9
4
43
38/32/26
4
MP06B
Single phase
230V,50Hz
10
0.22
23
0.22
RCOJ 40-ED
788O295O225
9
4
43
38/32/26
4
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
W
A
mm
kg
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
4
4
90
80
70
60
50
40
30
20
10
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
1m
90
80
70
60
50
40
30
20
10
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
5
5
50
42
58
42
60753 128
295
58
42
2255
42
57
7459
41.5
214
235
253.5
18.5
320335
155 155
21540.5
254.5
5959 225 225
2
119
137
8
100
57
140
18
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
6
6
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
7
REFRIGERANT SYSTEM DIAGRAM
MSZ-HA25VA
MSZ-HA35VA
Unit : mm
7
8
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 :
J2
J1
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.
8
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.
9
9
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.
10
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