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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-JX09WL
MUZ-JX12WL
MUZ-JX09WLH
MUZ-JX12WLH
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U1
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U1
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U1
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U1
Indoor unit service manual
MSZ-JX•WL Series (OBH947)
CONTENTS
1. TECHNICAL CHANGES ······························ 2
USING REFRIGERANT R454B ····················· 3
3. PART NAMES AND FUNCTIONS ·················· 8
4. SPECIFICATION ········································· 9
5. OUTLINES AND DIMENSIONS ···················· 11
6. WIRING DIAGRAM ····································12
7. REFRIGERANT SYSTEM DIAGRAM ············14
8. DATA ·······················································16
9. ACTUATOR CONTROL ······························25
10. SERVICE FUNCTIONS ·······························26
11. TROUBLESHOOTING ································27
12. DISASSEMBLY INSTRUCTIONS ··················51
PARTS CATALOG (OBB948)
No. OBH948
HFC
utilized
R454B
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-JX09WL-U1
Summary of Contents for Mitsubishi Electric MUZ-JX09WL-U1
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Page 1: Table Of Contents
OUTDOOR UNIT No. OBH948 utilized SERVICE MANUAL R454B Models MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH Indoor unit service manual MSZ-JX•WL Series (OBH947) CONTENTS 1. TECHNICAL CHANGES ······························ 2 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B ····················· 3 3. PART NAMES AND FUNCTIONS ·················· 8 4. -
Page 2: Technical Changes
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. -
Page 3: Servicing Precautions For Units Using Refrigerant R454B
SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B Servicing precautions for units using refrigerant R454B Refrigerant WARNING Safety Group This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. -
Page 4: Additional Refrigerant Charge
2. Additional refrigerant charge Additional refrigerant charge Refrigerant for the indoor units and the extended piping is not included in the outdoor unit when the unit is shipped from the factory. Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service, enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces pro- vided on the “Refrigerant amount”... - Page 5 3. Cautions for the unit using R454B refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. ■ Information on servicing 1. Checks to the area Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized.
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Page 6: Detection Of Flammable Refrigerants
■ Repairs to sealed components Sealed electrical components must be replaced. ■ Repair to intrinsically safe components Intrinsically safe components shall be replaced. ■ Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. - Page 7 ■ Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant.
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Page 8: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-JX09WL MUZ-JX09WLH MUZ-JX12WL MUZ-JX12WLH Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet OBH948... -
Page 9: Specification
SPECIFICATION MUZ-JX09WL MUZ-JX12WL Outdoor unit model MUZ-JX09WLH MUZ-JX12WLH Cooling * Btu/h 9,000 (3,600 – 11,000) 12,000 (3,600 – 13,400) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 10,900 (4,000 – 13,000) 12,200 (4,500 – 15,500) Capacity Heating 17 * Btu/h 6,800 (7,200) 7,800 (9,000) -
Page 10: Test Condition
Test condition *3, *4 AHRI Indoor air condition (°F) Outdoor air condition (°F) Mode Test 210/240 Dry bulb Wet bulb Dry bulb Wet bulb “A-Full” Cooling Steady State at rated compressor speed “B-Full” Cooling Steady State at rated compressor speed SEER “B-Low”... -
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-JX09WL MUZ-JX12WL Unit: inch MUZ-JX09WLH MUZ-JX12WLH REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear (JX09/12WL) (JX09/12WLH) When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) ø1/4... -
Page 12: Wiring Diagram
WIRING DIAGRAM MUZ-JX09WL MUZ-JX12WL OBH948... - Page 13 MUZ-JX09WLH MUZ-JX12WLH OBH948...
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Page 14: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-JX09WL MUZ-JX09WLH Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) Outdoor thermistor Muffler heat Discharge Flared connection RT68 Service port exchanger temperature Service port thermistor (high pressure) (low pressure) - Page 15 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-JX09WL MUZ-JX09WLH MUZ-JX12WL MUZ-JX12WLH Indoor unit Max. Height difference Max. Length Outdoor unit OBH948...
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Page 16: Data
DATA MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH 8-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) 11.0 0.65 0.64 10.3 0.65 0.70 0.65 0.76 MUZ-JX09WL 10.4 0.78 0.60 0.78 0.67 0.78 0.72 MUZ-JX09WLH 0.91 0.58 0.91 0.64... - Page 17 4) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.53 0.67 0.79 0.88 10.6 0.92 11.0 0.94 12.4 0.97 MUZ-JX09WL 0.51 0.65 0.77 0.86 10.9 0.90 11.2 0.92 12.7 0.95 0.49 0.62 0.74 10.0 0.83 11.2 0.88 11.6...
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Page 18: Performance Curve
8-2. PERFORMANCE CURVE Cooling (at Rated frequency) Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-JX09WL MUZ-JX09WLH MUZ-JX12WL MUZ-JX12WLH SHF at rating condition = 0.78 SHF at rating condition = 0.82 = 337 CFM = 422 CFM Airflow Airflow... - Page 19 Heating (at Rated frequency) Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-JX09WL MUZ-JX12WL = 384 CFM = 395 CFM Airflow Airflow Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-JX09WLH MUZ-JX12WLH Airflow = 384 CFM Airflow = 395 CFM...
- Page 20 8-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-JX09WL MUZ-JX09WLH (psig) (psig) 95 100 105 110 115 (°F) 95 100 105 110 115 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-JX12WL MUZ-JX12WLH (psig)
- Page 21 Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. MUZ-JX09WL MUZ-JX09WLH (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-JX12WL MUZ-JX12WLH (psig) (psig) (°F)
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Page 22: Standard Operation Data
8-4. STANDARD OPERATION DATA Model MSZ-JX09WL MSZ-JX12WL Item Unit COOL HEAT COOL HEAT Capacity Btu/h 9,000 10,900 12,000 12,200 — 0.78 — 0.82 — Input 0.72 0.96 0.99 Rated frequency Indoor unit MSZ-JX09WL MSZ-JX12WL Power supply V, phase, Hz 115, 1, 60 115, 1, 60 Input 0.018... - Page 23 8-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-JX09WL MUZ-JX09WLH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-JX12WL MUZ-JX12WLH...
- Page 24 8-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation) 1. Press the emergency operation switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4.
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Page 25: Actuator Control
ACTUATOR CONTROL MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH 9-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds Compressor... -
Page 26: Service Functions
SERVICE FUNCTIONS MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH 10-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 11-6.1.). Jumper Defrost finish temperature Soldered 46°F (8°C) (Initial setting) None... -
Page 27: Troubleshooting
TROUBLESHOOTING MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 28 11-2. FAILURE MODE RECALL FUNCTION AND ERROR CODE DISPLAY MODE Outline of the function This air conditioner can memorize the failure which has occurred last time. Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure can be recalled.
- Page 29 A (From previous page) Press OFF/ON (stop/operate) button of the remote controller with the remote controller headed towards the indoor unit. *1. The indoor unit is normal, but the outdoor unit might be abnormal. Does the left operation indicator lamp on the indoor There are some abnormalities that cannot be recalled with this way.
- Page 30 2. Flow chart of the outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if the outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. Get close to the front of the indoor unit.
- Page 31 A (From previous page) Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the failure parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to “Setting up the failure mode recall function”...
- Page 32 3. Flow chart of error code display mode This explains how customers can check the error code on their own. This is included in OPERATING INSTRUCTIONS. Operational procedure The remote controller is powered OFF. Get close to the front of the indoor unit. Point the remote controller at the receiving section of the indoor unit, and keep pressing CHECK with a fine-tipped object unil the beeps.
- Page 33 4. Table of outdoor unit failure mode recall function Operation Indoor/outdoor Outdoor unit Error indicator Abnormal point LED indication unit failure Condition Remedy failure mode lamp code (Failure mode/protection) (Outdoor P.C. board) mode recall recall function (Indoor unit) function Not blink None (Normal) —...
- Page 34 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.). Operation Indoor/outdoor Outdoor unit Error indicator Abnormal point LED indication unit failure Condition Remedy failure mode lamp code (Failure mode/protection) (Outdoor P.C. board) mode recall recall function (Indoor unit) function...
- Page 35 11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
- Page 36 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Deceleration of the When the input current exceeds approximately 10A, compres- The unit is normal, but check the operates. 2.5 seconds OFF operational sor frequency lowers. following. frequency of the •...
- Page 37 11-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the thermistor (RT64) chart of thermistor.
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Page 38: Troubleshooting Flow
11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 11-5. - Page 39 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points *Measure the resistance between the lead wires at 3 points. BLK-WHT BLK-RED WHT-RED <<Judgement>>...
- Page 40 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 11-6.1.) board.
- Page 41 H Check of R.V. coil MUZ-JX09/12 * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. * In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
- Page 42 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 11-4.) Disconnect CN932 from the inverter P.C.
- Page 43 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Rectify indoor/outdoor Turn ON power supply and press connecting wire. the emergency operation switch. Does the left lamp of the operation Is there voltage 115 V AC Replace the indoor indicator lamp on the indoor unit between the indoor terminal...
- Page 44 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both Operation select button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds.
- Page 45 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5. .) Is the fuse (F901) blown on the inverter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
- Page 46 M How to check miswiring and serial signal error Turn ON the power supply. Is there rated voltage in the power supply? Check the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press the emergency operation switch once.
- Page 47 N Check of defrost heater Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. 2. Is the resistance of defrost heater normal? Refer to 11-4. 3. Does the heater protector remain conducted (not open)? 4.
- Page 48 P Check of compressor protector Disconnect the connector of compressor protector in the inverter P.C. board, and check the conduc- tion of compressor protector. Operate the unit Is the discharge temperature Is the compressor and re-confirm if thermistor normal? Refer to 11-5. protector conductive? the abnormality “Check of outdoor thermistors”.
- Page 49 Q Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the out- or is the distance between the antennas door unit.
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Page 50: Inverter P.c. Board
11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-JX09WL MUZ-JX12WL MUZ-JX09WLH MUZ-JX12WLH Smoothing Smoothing Heater R.V.coil Back side of unit capacitor capacitor (CN722) (CN721) DB61 (C61) (C62) 115 V AC 115 V AC 260 – 370 V DC Jumper wire for pre-heat Fuse (F701) -
Page 51: Disassembly Instructions
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 the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. -
Page 52: Operating Procedure
OPERATING PROCEDURE PHOTOS/FIGURES Screws of Screw of the Photo 4 Screws of the Photo 5 the back panel conduit plate conduit cover 2. Removing the inverter assembly, inverter P.C. Photo 6 board Screw of the heat sink (1) Remove the top panel, cabinet and service panel. support and the separator (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following... - Page 53 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter Photo 9 P.C. board (Photo 9) MUZ-JX09WL 1. Connect the lead wires of the fan motor (Power) to the MUZ-JX09WLH connector on the inverter P.C. board. Pull the lead wires Lead wires of Lead wires of Lead wires of the outdoor...
- Page 54 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R.V. coil Photo 10 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) Screw of (3) Remove the R.V. coil. the R.V. coil Discharge temperature thermistor...
- Page 55 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 12 Screws of the outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut.
- Page 56 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2024. No. OBH948 Made in Japan Specifications are subject to change without notice.
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