Mitsubishi Electric MUZ-JP WA, MSZ-JP12WA, MSZ-JP09WA Service Manual
INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
U1
MSZ-JP09WA
MSZ-JP12WA
-
U1
-
No. OBH820
MSZ-JP09WA
Outdoor unit service manual
MUZ-JP•WA Series (OBH821)
CONTENTS
1. TECHNICAL CHANGES
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················ 11
9. TROUBLESHOOTING ·······························15
10. DISASSEMBLY INSTRUCTIONS ·················27
PARTS CATALOG (OBB820)
· ·······························
2
Use the specifi ed refrigerant only
OBH820
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
1
TECHNICAL CHANGES
MSZ-JP09WA
MSZ-JP12WA
1. New model
U1
-
U1
-
2
2
OBH820
PART NAMES AND FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
Air ¿ lter
Air cleaning ¿ lter
(Anti-Allergy Enzyme
Filter, option)
Air inlet
Air outlet
Horizontal vane
Display section
Front panel
Heat exchanger
Remote controller
Remote control receiving section
ACCESSORIES
Installation plate 1
Attachment screws for the installation plate
4 × 25 mm
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Remote controller holder 1
Screws for the remote controller holder
3.5 × 16 mm (Black)
Operation indicator lamp
Emergency operation switch
5
2
3
3
OBH820
Indoor model MSZ-JP09WA MSZ-JP12WA
Power supply V, phase, Hz 115, 1, 60
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity A 1.4
Fan motor F.L.A 1.07
Airfl ow
Super High - High - Med. Low
Moisture removal pt./h 1.5 2.5
Sound level
Super High - High - Med. Low
Fan speed
Super High - High - Med. Low
Cond. drain connection O.D. in. 5/8
Dimensions
Weight Ib. 22
External fi nish Munsell 1.0Y 9.2/0.2
Control voltage (by built-in transformer) 12 - 24 V DC
NOTE: Test conditions are based on AHRI 210/240.
SPECIFICATION
COOL Dry
(Wet)
HEAT Dry CFM 406 - 321 - 237 - 170
Cooling dB(A) 43 - 37 - 30 - 22 45 - 37 - 30 - 22
Heating dB(A) 43 - 37 - 30 - 22
Cooling rpm 1,020 - 860 - 670 - 530
Heating rpm 1,040 - 860 - 670 - 530
W
D 9-1/8
H 11-5/8
A15 20
CFM
in.
399 - 321 - 237 - 170
(364 - 286 - 201 - 134)
31-7/16
4
3-1. OPERATING RANGE
OBH820
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit
115 V
1 phase
60 Hz
(2) OPERATION
Mode Condition
Standard temperature 80 67 95 —
Cooling
Heating
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -4 -5
3-2. OUTLET AIR SPEED AND COVERAGE
Model Mode Function
HEAT Dry 406 20.6 29.5
MSZ-JP09WA
MSZ-JP12WA
COOL
HEAT Dry 406 20.6 29.5
COOL
Dry 399 20.2 29.0
Wet 364 18.4 26.5
Dry 399 20.2 29.0
Wet 364 18.4 26.5
Airfl ow
(CFM)
Min. 103
Indoor Outdoor
DB WB DB WB
Air speed
(ft./s.)
115
Max. 127
Intake air temperature (°F)
Coverage
(ft.)
● The air coverage is the figure up to the
position where the air speed is 1 ft./s.,
when air is blown out horizontally from
the unit properly at the High speed position.
The coverage should be used only as a
general guideline since it varies according to the size of the room and furniture
arranged inside the room.
5
4
OBH820
OUTLINES AND DIMENSIONS
MSZ-JP09WA MSZ-JP12WA
2-1/4
5-1/2
11/16
Unit: inch
Insulation ø1 - 3/8 O.D
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16
Piping
Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D
(Flared connection: ø3/8)
6
5
OBH820
MSZ-JP09WA MSZ-JP12WA
WIRING DIAGRAM
7
6
OBH820
REFRIGERANT SYSTEM DIAGRAM
MSZ-JP09WA MSZ-JP12WA
Refrigerant pipe ø3/8 (ø9.52)
(with heat insulator)
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Flared connection
Flared connection
Unit: inch (mm)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
8
7
OBH820
SERVICE FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
7-1. TIMER SHORT MODE
For service, the set time can be shortened by bridging of the timer short point on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to
3 seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.
7-2. REMOTE CONTROLLER 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, the remote controller P.C. boards 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 modification, take out the
batteries and press the STOP/
OPERATE (OFF/ON) button 2
or 3 times at first.
After finish modification, put
back the batteries then press
the RESET button.
The remote controller 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
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modifi cation Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and 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 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 is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
9
7-3. AUTO RESTART FUNCTION
OBH820
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. “AUTO RESTART FUNCTION” automatically starts operation in
the same mode just before the shut-off of the main power.
Operation
If the main power 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.)
How to disable “AUTO RESTART FUNCTION”
Turn OFF the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
JR07
Indoor electronic
control P.C. board
CN111CN112
CN151
CN10A
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 turned 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 the breaker from tripping 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.
10
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