MITSUBISHI ELECTRIC MSZ-JP09WA Split Type Air Conditioners Owner’s Manual

MSZ-JP09WA Split Type Air Conditioners

SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT

Revision C:
Remote controller P.C. board has been added. (7-2.)
OBH820 REVISED EDITION-B is void.
No. OBH820
REVISED EDITION-C
SERVICE MANUAL
Models
MSZ-JP09WA – U1 ,U2
MSZ-JP12WA -U1 ,U2
Outdoor unit service manual
MUZ-JP•WA Series (OBH821)
Use the specified 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 modified.
Revision B:
MSZ-JP09WA- U2 and MSZ-JP12WA- U2 have been added.
Revision C:
Remote controller P.C. board has been added. (7-2.)

TECHNICAL 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.

PART NAMES AND FUNCTIONS

MSZ-JP09WA MSZ-JP12WA ACCESSORIES

SPECIFICATION

Airflow
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| ptJh| 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| W| in.| 31-7/16
D| 9-1/8
H| 11-5/8
Weight| lb.| 22
External finish| 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.

3-1. OPERATING RANGE
(1) POWER SUPPLY

| Rated voltage| Guaranteed voltage (V)
---|---|---
Indoor unit| 115 V
1 phase
60 Hz|

(2) OPERATION

3-2. OUTLET AIR SPEED AND COVERAGE

● 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.

OUTLINES AND DIMENSIONS

MSZ-JP09WA MSZ-JP12WA

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

MSZ-JP09WA MSZ-JP12WA

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.
NOTE: For modification, take out the batteries and press the STOP/OPERATE (OFF/ON) button 2 or 3 times at first.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has one of the following prints: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 modification| 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.
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

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 disable “AUTO RESTART FUNCTION”

1. Turn OFF the main power of the unit.
2. 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.)

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.

MICROPROCESSOR CONTROL

MSZ-JP09WA MSZ-JP12WA
WIRELESS REMOTE CONTROLLER NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the remote controller with beeps.
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
The following indication applies regardless of shape of the indication.

away from set temperature
| The room temperature is approaching the set temperature| About 2 to 4 °F (1° to 2°C) from set temperature

Lit
Blinking
Not lit

8-1. COOL (  ) OPERATION

1. Press STOP/OPERATE (OFF/ON) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
2. Select COOL mode with OPERATION SELECT button.
3. Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 – 88°F (16 – 31°C).

1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.
8-2. DRY ( ) OPERATION

1. Press STOP/OPERATE (OFF/ON) button.
   OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

2. Select DRY mode with OPERATION SELECT button.

3. The set temperature is determined from the initial room temperature.

1. Coil frost prevention
Coil frost prevention works the same way as that in COOL mode. (8-1.1.)
8-3. HEAT ( ) OPERATION

1. Press STOP/OPERATE (OFF/ON) button.
   OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

2. Select HEAT mode with OPERATION SELECT button.

3. Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
   The setting range is 61 – 88°F (16 – 31°C).

1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control.
This mode continues until the temperature of indoor heat exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
8-4. AUTO VANE OPERATION
1. Horizontal vane

1. Vane motor drive
   These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
   the motor are controlled by pulse signals (approximately 12 V) transmitted from indoor microprocessor.

2. The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.

3. Positioning
   To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected angle.
   Confirmation of standard position is performed in the following cases:
   (a) When the operation starts or finishes (including timer operation).
   (b) When the test run starts.
   (c) When standby mode (only during multi system operation) starts or finishes.

4. VANE AUTO ( ) mode
   In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
   In COOL and DRY operation
   Vane angle is fixed to Horizontal position. In HEAT operation
   Vane angle is fixed to Angle 5.

5. STOP (operation OFF) and ON TIMER standby
   In the following cases, the horizontal vane returns to the closed position.
   (a) When STOP/OPERATE (OFF/ON) button is pressed (POWER OFF).
   (b) When the operation is stopped by the emergency operation.
   (c) When ON TIMER is ON standby.

6. Dew prevention
   During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
   exceeds 0.5 – 1 hour, the vane angle automatically changes to Angle 2 for dew prevention.

7. SWING ( ) mode
   By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.

8. Cold air prevention in HEAT operation.
   The horizontal vane position is set to Upward.

9. ECONO COOL ( ) operation (ECONOmical operation)
   When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 4°F (2°C) higher.
   Also the horizontal vane swings in various cycle.
   SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air conditioner can keep comfort. As a result, energy can be saved.
   ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode.

8-5. TIMER OPERATION (ON/OFF TIMER)

1. How to set the timer

2. Press STOP/OPERATE (OFF/ON) button to start the air conditioner.

3. Select the timer mode by pressing the button during operation.
   Each time this button is pressed, the timer mode is changed in sequence:
   (OFF TIMER) (ON TIMER) → TIMER RELEASE

4. Set the time of the timer using the  button.
   Each time this button is pressed, the set time increase or decrease by 1 hour to 12 hours.

5. To release the timer
   Press the button until (OFF TIMER) and (ON TIMER) are not displayed.

NOTE:

• The OFF TIMER and the ON TIMER cannot be set at the same time.
• The displayed time is the time remaining and will decrease in 1-hour increments as time passes.

8-6. EMERGENCY/TEST OPERATION
In the case of test run operation or emergency operation, use the emergency operation switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down. The unit will start and OPERATION INDICATOR lamp will light up.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High speed and the temperature control does not work.
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of 75°F (24°C). The fan speed shifts to Med.
The coil frost prevention works even in the test run or the emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
Emergency operation continues until the emergency operation switch is pressed once or twice or the unit receives any signal from the remote controller. In the latter case, normal operation will start.
NOTE: Do not press the emergency operation switch during normal operation.

The operation mode is indicated by the Operation Indicator lamp as follows:
Operation Indicator lamp 8-7. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect compressor from overload.
8-8. Changing temperature indication (°F/°C)

• The preset unit is °F.
• °F → °C: Press RESET button while the TEMPERATURE buttons are pressed.
• °C → °F: Press RESET button while the TEMPERATURE buttons are pressed.

Press RESET button gently using a fine-tipped object.

TROUBLESHOOTING

MSZ-JP09WA MSZ-JP12WA
9-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

2. Check the power supply voltage.

3. Check the indoor/outdoor connecting wire for miswiring.

4. Take care of the following during servicing

5. 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.

6. Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.

7. When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.

8. When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.

9. Troubleshooting procedure

10. First, check if the OPERATION INDICATOR lamp on the indoor unit is blinking ON and OFF to indicate an abnormality.
    To make sure, check how many times the OPERATION INDICATOR lamp is blinking ON and OFF before starting service work.

11. Before servicing, verify that all connectors and terminals are connected properly.

12. When the electronic control P.C. board seems to be defective, check for disconnection of the copper foil pattern and burnt or discolored components.

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

14. How to replace batteries
    Weak batteries may cause the remote controller malfunction.
    In this case, replace the batteries to operate the remote controller normally.

15. Remove the back lid and insert batteries. Then reattach the back lid.

16. Press RESET button with a fine-tipped object, 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 microprocessor when batteries are replaced.
   This function is equipped to prevent the microprocessor from malfunctioning due to the voltage drop caused by the battery replacement.

3. Do not use the leaking batteries.

9-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure NOTE:

1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
   *2. Blinking pattern when the indoor unit is abnormal:

2. Table of indoor unit failure mode recall function

Upper lamp of OPERATION
INDICATOR lamp| Abnormal point (Failure mode)| Condition| Remedy
---|---|---|---
Not lit| Normal| —| —
1-time blink every 0.5-second| Room temperature thermistor| The room temperature thermistor short or is
open circuit s detected every 8 seconds during operation.| Refer to the characteristics of the room temperature thermistor (9-7.).
2-time blink 2.5-second OFF| Indoor coil thermistor| The indoor coil thermistor short or open circuit is detected every 8 seconds during operation.| Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (9-7.).
3-time blink 2.5-second OFF| Serial signal| The serial signal from outdoor unit is not re- ceived for a maximum of 6 minutes.| Refer to 9-6.0 “How to check miswiring and serial signal error.
11-time blink 2.5-second OFF| Indoor fan motor| The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan motor is operated.| Refer to 9-6.® “Check of indoor fan motor.
12-time blink 2.5-second OFF| Indoor control system| It cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.| Replace the indoor electronic control P.C. board.

NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (9-4.).
9-3. INSTRUCTION OF TROUBLESHOOTING 9-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks. 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS
MSZ-JP09WA MSZ-JP12WA 9-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan does not operate.The indoor fan motor error has occurred, and the indoor fan repeats “12-second ON and 30-second OFF” 3 times, and then stops. B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone. It is normal if the LED of the signal transmitting section lights up when the STOP/ OPERATE (OFF/ON) button on the remote controller is pressed. However, it may be difficult to see the illuminated LED of the signal transmitting section with a smartphone camera.
*2 If the inverter fluorescent light is turned on when the room is cool, the unit may have difficulty receiving the signal from the remote controller or may not be able to operate with it; if the inverter fluorescent light is turned on when the room is warm, the unit may be able to operate with the remote controller.
C Check of indoor P.C. board and indoor fan motor
MSZ-JP09/12NA – U1 MSZ-JP09/12NA – U2 D How to check miswiring and serial signal error E Electromagnetic noise enters into TV sets or radios Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring).
Check the followings before asking for service.

1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of: indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
8. Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.
9. Within 3 minutes after turning ON the power supply, press STOP/OPERATE (OFF/ON) button on the remote controller for power ON, and check for the electromagnetic noise.
10. After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
11. Press STOP/OPERATE (OFF/ON) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

9-7. Test point diagram and voltage
MSZ-JP09WA – U1
MSZ-JP12WA – U1
1. Indoor power P.C. board, Indoor terminal P.C. board MSZ-JP09WA – U2
MSZ-JP12WA – U2
1. Indoor power P.C. board, Indoor terminal P.C. board

DISASSEMBLY INSTRUCTIONS

< Detaching method of the terminal with locking mechanism>
The terminal which has the locking mechanism can be detached as shown below.
There are 2 types of terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.

1. Slide the sleeve and check if there is a locking lever or not.
   

2. The terminal with this connector shown below has the locking mechanism.

10-1. MSZ-JP09WA MSZ-JP12WA
NOTE: Turn OFF the power supply before disassembly.
: Indicates the visible parts in the photos/figures.
: Indicates the invisible parts in the photos/figures.

1. Removing the panel
(1) Remove the horizontal vanes.
(2) Remove the screw caps of the panel. Remove the screws of the panel.
(3) Unhook the lower part (A) of the panel.
(4) Hold the lower part of both ends of the panel and pull it slightly toward you, and then remove the panel by pushing it upward.|
2. Removing the indoor electronic control P.C. board and the room temperature thermistor
(1) Remove the panel (Refer to section 1.) and the corner box.
(2) Remove the screw of the V.A. clamp and the V.A. clamp.
(3) Loosen the screw of the indoor/outdoor connecting wire and remove the indoor/outdoor connecting wire.
(4) Remove the screw of the electrical cover and the electrical cover.
(5) Open the indoor electronic control P.C. board holder (toright side)
(6) Disconnect the following connectors: