Mitsubishi Electric MUZ-AY25VG Service Manual
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Mitsubishi Electric MUZ-AY25VG Service Manual

Outdoor unit
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Table of Contents

OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-AY25VG
MUZ-AY35VG
MUZ-AY42VG
MUZ-AY50VG
MUZ-AY25VGH
MUZ-AY35VGH
MUZ-AY42VGH
MUZ-AY50VGH
MUZ-AY25VG
MUZ-AY35VG
MUZ-AY42VG
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,
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E1
ET1
ER1
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,
,
E1
ET1
ER1
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,
,
E1
ET1
ER1
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E1
,
ET1
,
ER1
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SC1
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SC1
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SC1
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SC1
Indoor unit service manual
MSZ-AY•VG, VGK, VGKP Series (OBH930, 932)
MUZ-AY25VGH
MUZ-AY35VGH
MUZ-AY42VGH
HFC
utilized
R32
CONTENTS
1. TECHNICAL CHANGES ······························3
USING REFRIGERANT R32 ·························4
3. PART NAMES AND FUNCTIONS ··················6
4. SPECIFICATION ········································7
5. NOISE CRITERIA CURVES ··························9
6. OUTLINES AND DIMENSIONS ··················· 10
7. WIRING DIAGRAM ··································· 12
8. REFRIGERANT SYSTEM DIAGRAM ··········· 18
9. PERFORMANCE CURVES ························· 20
10. ACTUATOR CONTROL ····························· 36
11. SERVICE FUNCTIONS ······························ 37
12. TROUBLESHOOTING ······························· 38
13. DISASSEMBLY INSTRUCTIONS ················· 58
PARTS CATALOG (OBB931)
No. OBH931

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Summary of Contents for Mitsubishi Electric MUZ-AY25VG

  • Page 1: Table Of Contents

    OUTDOOR UNIT No. OBH931 utilized SERVICE MANUAL Models MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH Indoor unit service manual MSZ-AY•VG, VGK, VGKP Series (OBH930, 932) MUZ-AY25VG MUZ-AY25VGH CONTENTS MUZ-AY35VG MUZ-AY35VGH 1. TECHNICAL CHANGES ······························3 MUZ-AY42VG MUZ-AY42VGH 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ·························4...
  • Page 2 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: Technical Changes

    TECHNICAL CHANGES MUZ-AY25VG - MUZ-AY35VG - MUZ-AY42VG - MUZ-AY50VG - MUZ-AY25VGH - MUZ-AY35VGH - MUZ-AY42VGH - MUZ-AY50VGH - 1. New model OBH931...

  • Page 4: Servicing Precautions For Units Using Refrigerant R32

    SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 Servicing precautions for units using refrigerant R32 WARNING 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 5 5. Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. 6. Leak Detection Methods Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need recalibration.

  • Page 6: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-AY25VG MUZ-AY50VG MUZ-AY35VG MUZ-AY50VGH MUZ-AY42VG MUZ-AY25VGH Air inlet MUZ-AY35VGH (Back and side) MUZ-AY42VGH Air inlet (Back and side) Piping Piping Air outlet Air outlet Drain hose Drain hose Drain outlet Drain outlet ACCESSORIES MUZ-AY25VG MUZ-AY35VG MODELS...

  • Page 7: Specification

    SPECIFICATION MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG Outdoor model MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH Single phase, 230 V, 50 Hz Power supply 2.5 (0.9 - 3.4) 4.2 (0.9 - 4.5) 5.0 (1.4 - 5.4) Cooling 3.5 (1.1 - 3.8) Capacity Rated (Min.-Max.) 3.2 (1.0 - 4.1) 4.0 (1.3 - 4.6)
  • Page 8 Specifications and rated conditions of main electric parts Model MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Item AY25VG AY25VGH AY35VG AY35VGH AY42VG AY42VGH AY50VG AY50VGH 600 µF/ 620 µF 420 V (C61, C62) Smoothing 600 µF/ 620 µF 420 V capacitor (C63) —...

  • Page 9: Noise Criteria Curves

    NOISE CRITERIA CURVES MUZ-AY25VG MUZ-AY35VG FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE MUZ-AY25VGH MUZ-AY35VGH COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG Unit: mm MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH (MUZ-AP25/35/42VG) (MUZ-AP25/35/42VGH) OBH931...
  • Page 11 MUZ-AY50VG Unit: mm MUZ-AY50VGH OBH931...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM MUZ-AY25VG - MUZ-AY35VG - MUZ-AY25VG - MUZ-AY35VG - OBH931...
  • Page 13 MUZ-AY25VGH - MUZ-AY35VGH - OBH931...
  • Page 14 MUZ-AY42VG - MUZ-AY42VG - OBH931...
  • Page 15 MUZ-AY42VGH - OBH931...
  • Page 16 MUZ-AY50VG - MUZ-AY50VG - OBH931...
  • Page 17 MUZ-AY50VGH - OBH931...

  • Page 18: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-AY25VG MUZ-AY35VG Unit: mm MUZ-AY25VGH MUZ-AY35VGH Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62 Ambient...
  • Page 19 MUZ-AY50VG Unit: mm MUZ-AY50VGH Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger temperature Stop valve thermistor Outdoor RT68 heat Muffler Discharge exchanger Flared connection temperature thermistor RT62 Ambient temperature Compressor thermistor RT65 Defrost thermistor RT61 Capillary tube ø3.0×ø2.0×210 (x2) Strainer #100...

  • Page 20: Performance Curves

    PERFORMANCE CURVES MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions vary according to the areas where these units are installed, the following information has been provided to clarify the oper- ating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 21 9-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) 11.8 12.9 Indoor intake air Wet-bulb 10.9 11.8 temperature( ) 10.8 Outdoor intake air Dry-bulb temperature(°C) Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 17.7...
  • Page 22 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-AY25VG MUZ-AY25VGH Correction of Cooling capacity Correction of Cooling input Correction of Heating capacity Correction of Heating input The operational frequency The operational frequency The operational frequency The operational frequency...
  • Page 23 9-3. 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.
  • Page 24 9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature (°C) Relative humidity (%) Both indoor and outdoor unit are under the same temperature/ humidity condition. Operation: TEST RUN OPERATION (Refer to 9-3.) Outdoor low pressure MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH (kgf/cm [Gauge])(MPa [Gauge])
  • Page 25 Outdoor unit current MUZ-AY42VG MUZ-AY35VG MUZ-AY25VG MUZ-AY35VGH MUZ-AY42VGH MUZ-AY25VGH Ambient temperature (°C) Ambient temperature (°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-AY50VG MUZ-AY50VGH Ambient temperature (°C) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor 20.0 20.0 Dry bulb temperature (°C) Wet bulb temperature (°C) 14.5...
  • Page 26 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY25VG MUZ-AY25VGH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 0.74 2.08 0.74 2.70 2.00 0.74 2.60 0.74 2.94 2.17 2.81...
  • Page 27 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY25VG MUZ-AY25VGH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 0.74 0.74 2.08 0.74 2.45 1.81 2.25 1.67 1.54 1.60 0.62 2.40...
  • Page 28 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY35VG MUZ-AY35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 0.70 0.70 0.70 0.70 4.11 2.88 3.94 2.76 3.78 2.65 3.64 2.55 0.58...
  • Page 29 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY35VG MUZ-AY35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.40 0.70 0.70 1030 2.03 0.70 1069 3.43 3.15 2.21 2.91 2.09 0.58 1010...
  • Page 30 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY42VG MUZ-AY42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 0.59 1040 0.59 1092 0.59 0.59 4.94 2.91 4.73 2.79 4.54 2.68 1144...
  • Page 31 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY42VG MUZ-AY42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 0.59 0.59 2.06 0.59 1404 4.12 2.43 1274 3.78 2.23 1352 3.49 2.03 0.47...
  • Page 32 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY50VG MUZ-AY50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 0.56 0.56 5.40 3.02 0.56 5.20 0.56 5.88 3.29 1232 5.63 3.15 1294...
  • Page 33 PERFORMANCE DATA COOL operation at Rated frequency MUZ-AY50VG MUZ-AY50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 0.56 1509 4.50 0.56 1602 0.56 2.74 2.52 4.15 2.32 1663 0.44 4.80...
  • Page 34 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AY25VG CAPACITY: 3.2 kW INPUT: 780 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.60 2.02 4.06 2.43 2.85 3.26 3.68 4.48 1.50 2.30 3.10 3.90 4.30...
  • Page 35 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AY50VG CAPACITY: 5.5 kW INPUT: 1470 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 4.90 7.70 2.75 3.47 4.18 1147 1294 5.61 1397 6.33 1485 6.99 1529 1558 3.30...

  • Page 36: Actuator Control

    ACTUATOR CONTROL MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH 10-1. 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.

  • Page 37: Service Functions

    SERVICE FUNCTIONS MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH 11-1. 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 12-6-1.) Defrost finish temperature (°C)

  • Page 38: Troubleshooting

    TROUBLESHOOTING MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH 12-1. 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, and after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 39 12-2. 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 (12-3.) disappears, the memorized failure details can be recalled. 1.
  • Page 40 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. *1.
  • Page 41 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Upper lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Failure mode/protection) (Indoor unit) (Outdoor P.C.
  • Page 42 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Upper lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Failure mode/protection) (Indoor unit) (Outdoor P.C. board) mode recall recall function function 14-time blink Stop valve (Closed valve)
  • Page 43 12-3. 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 44 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 4-time blink Deceleration of the Temperature of discharge temperature thermistor exceeds • Check refrigerant circuit and refrig- operates. 2.5 seconds OFF operational fre- 111°C, compressor frequency lowers. erant amount. “Check of LEV”. quency of the com- •...
  • Page 45 12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for Fin temperature thermistor (RT64) the chart of thermistor. Ambient temperature thermistor (RT65) Outdoor heat exchanger...
  • Page 46 12-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). “Check of open phase”. Check the voltage between terminals. See 12-5. Are the voltages balanced? Replace the inverter P.C. board. “Check of compressor”. Check the compressor.
  • Page 47 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 BLK-WHT *Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
  • Page 48 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 12-6.1.) board.
  • Page 49 H Check of R.V. coil * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 12-4. * 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 50 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 12-4.) Disconnect CN932 from the inverter P.C.
  • Page 51 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and Rectify indoor/outdoor press the emergency operation switch. connecting wire. Is there voltage 230 V AC Does the upper lamp of Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
  • Page 52 K Check of LEV (Expansion valve) MSZ-AY25/35/42/50VGK MSZ-AY25/35/42/50VGKP 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 53 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 12-5. .) 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 54 M How to check miswiring and serial signal error Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored in the indoor unit.
  • Page 55 N Check of the outdoor refrigerant circuit The operation has stopped to prevent the diesel explosion Has the operation stopped during pump down? caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn the breaker OFF. CAUTION : Do not start the operation again to prevent hazards.
  • Page 56 O Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
  • Page 57 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY50VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH R.V.coil/21S4 Smoothing Smoothing Smoothing Defrost heater Back side of unit capacitor capacitor capacitor (CN721) (CN722) DB61 230 V AC 260 - 370 V DC...

  • Page 58: Disassembly Instructions

    Hold the sleeve, and Pull the terminal while pull out the terminal slowly. pushing the locking lever. Locking lever Connector 13-1. MUZ-AY25VG MUZ-AY35VG MUZ-AY42VG MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures.
  • Page 59 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the top panel, cabinet and service panel. (Refer to Screws of the heat sink Screws of the terminal block section 1.) support and the separator support and the back panel (2) Disconnect the lead wire to the reactor and the following connectors:...
  • Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to MUZ-AY42VGH section 1.) Ambient temperature (2) Disconnect the following connectors: thermistor <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
  • Page 61 13-2. MUZ-AY50VG MUZ-AY50VGH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 62 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. board Photo 3 Screw of the heat sink Screw of the (1) Remove the cabinet and panels (refer to section 1). support and the separator P.B. support and (2) Disconnect the lead wire to the reactor and the following the separator connectors: <Inverter P.C.
  • Page 63 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 6 board (Photo 6) Lead wires of Lead wires of the heat Lead wires of 1. Connect the lead wires of the heat exchanger temperature the ambient exchanger temperature, the expansion thermistor, the defrost thermistor and discharge tempera- temperature...
  • Page 64 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 7 (1) Remove the cabinet and panels (refer to section 1). Screw of the (2) Disconnect the following connectors: R.V. coil <Inverter P.C. board> Discharge CN721 (R.V. coil) temperature (3) Remove the R.V. coil. thermistor Compressor protector...
  • Page 65 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 10 (1) Remove the cabinet and panels (refer to section 1). Suction pipe Discharge pipe (2) Remove the inverter assembly (refer to section 2). brazed part brazed part (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm...
  • Page 66 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2022 MITSUBISHI ELECTRIC CORPORATION Published: Nov. 2022. No. OBH931 Specifications are subject to change without notice. Made in Japan...

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