Mitsubishi Electric MSZ-JP09WA-U1 User manual

Outdoor unit service manual
MUZ-JP•WA Series (OBH821)
PARTS CATALOG (OBB820)
MSZ-JP09WA
INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
Models
MSZ-JP09WA -U1 , U2
MSZ-JP12WA -U1 , U2
No. OBH820
REVISED EDITION-B
CONTENTS
1. TECHNICAL CHANGES· ·····························2
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·················29
OBH820 REVISED EDITION-A is void.
Revision B:
• MSZ-JP09WA- U2 and MSZ-JP12WA- U2
have been added.

2
1TECHNICAL CHANGES
MSZ-JP09WA - U1
MSZ-JP12WA - U1
1. New model
MSZ-JP09WA - U1 MSZ-JP09WA - U2
MSZ-JP12WA - U1 MSZ-JP12WA - U2
1. Indoor electronic control P.C. board has been changed.
Use the specied refrigerant only
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.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in injuries.
Revision A:
• 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modied.
Revision B:
• MSZ-JP09WA- U2 and MSZ-JP12WA- U2 have been added.
OBH820B

3
2PART NAMES AND FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
ACCESSORIES
Installation plate 1
Attachment screws for the installation plate
4 × 25 mm 5
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) 2
Horizontal vane
Air outlet
Air filter
Air inlet
Heat exchanger
Front panel
Air cleaning filter
(Anti-Allergy Enzyme
Filter, option)
Remote controller
Operation indicator lamp
Remote control receiving section
Emergency operation switch
Fan guard
OBH820B

4
3 SPECIFICATION
Indoor model MSZ-JP09WA MSZ-JP12WA
Power supply V, phase, Hz 115, 1, 60
Max. fuse size (time delay)/ Disconnect switch A 15 20
Min. circuit ampacity A 1.4
Fan motor F.L.A 1.07
Airow
Super High - High - Med. - Low
COOL Dry
(Wet)
CFM 399 - 321 - 237 - 170
(364 - 286 - 201 - 134)
HEAT Dry CFM 406 - 321 - 237 - 170
Moisture removal pt./h 1.5 2.5
Sound level
Super High - High - Med. - Low
Cooling dB(A) 43 - 37 - 30 - 22 45 - 37 - 30 - 22
Heating dB(A) 43 - 37 - 30 - 22
Fan speed
Super High - High - Med. - Low
Cooling rpm 1,020 - 860 - 670 - 530
Heating rpm 1,040 - 860 - 670 - 530
Cond. drain connection O.D. in. 5/8
Dimensions Win. 31-7/16 D 9-1/8
H 11-5/8
Weight Ib. 22
External 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.
OBH820B

5
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit 115 V 1 phase
60 Hz
Min. 103 115 Max. 127
(2) OPERATION
Mode Condition Intake air temperature (°F) Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Heating 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 Airow
(CFM) Air speed (ft./s.) Coverage (ft.)
MSZ-JP09WA HEAT Dry 406 20.6 29.5
COOL Dry 399 20.2 29.0
Wet 364 18.4 26.5
MSZ-JP12WA HEAT Dry 406 20.6 29.5
COOL Dry 399 20.2 29.0
Wet 364 18.4 26.5
● 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 accord-
ing to the size of the room and furniture
arranged inside the room.
OBH820B

6
Unit: inch
MSZ-JP09WA MSZ-JP12WA
4OUTLINES AND DIMENSIONS
11/16
5-1/2
2-1/4
Piping
Insulation ø1 - 3/8 O.D
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16
(Flared connection: ø3/8)
Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D
OBH820B

7
5WIRING DIAGRAM
MSZ-JP09WA - U1 MSZ-JP12WA - U1
MSZ-JP09WA - U2 MSZ-JP12WA - U2
OBH820B

8
Unit: inch (mm)
6REFRIGERANT SYSTEM DIAGRAM
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø3/8 (ø9.52)
(with heat insulator)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-JP09WA MSZ-JP12WA
OBH820B

9
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:
7SERVICE FUNCTIONS
MSZ-JP09WA MSZ-JP12WA
J2
J1
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.
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.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modi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.
OBH820B

10
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.
7-3. 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. “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. (U1)(Refer to 9-7.)
Cut the Jumper wire JR77 on the indoor electronic control P.C. board. (U2)(Refer to 9-7.)
CN111CN112
CN151
CN10A
Indoor electronic
control P.C. board
JR07(U1)
JR77(U2)
OBH820B