Mitsubishi Electric MUZ-LN35VGHZ Service Manual
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Mitsubishi Electric MUZ-LN35VGHZ Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-LN25VGHZ
MUZ-LN35VGHZ
MUZ-LN50VGHZ
MUZ-LN25VGHZ2
MUZ-LN35VGHZ2
MUZ-LN25VGHZ
MUZ-LN35VGHZ
Revision B:
• MUZ-LN25VGHZ2-
MUZ-LN35VGHZ2-
OBH768A is void.
HFC
utilized
R32
-
E1
ER1
ET1
,
,
-
E1
ER1
ET1
,
,
-
E1
ER1
ET1
,
,
-
E1
-
E1
Indoor unit service manual
MSZ-LN•VGW/V/B/R Series (OBH766)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
USING REFRIGERANT R32 ····························· 3
3. PART NAMES AND FUNCTIONS ····················· 5
4. SPECIFICATION ················································ 6
5. NOISE CRITERIA CURVES ······························ 9
6. OUTLINES AND DIMENSIONS ·······················11
7. WIRING DIAGRAM ·········································· 13
8. REFRIGERANT SYSTEM DIAGRAM ············· 16
9. PERFORMANCE CURVES ····························· 18
10. ACTUATOR CONTROL ··································· 35
11. SERVICE FUNCTIONS ···································· 36
12. TROUBLESHOOTING ····································· 37
13. DISASSEMBLY INSTRUCTIONS ···················· 59
PARTS CATALOG (OBB768)
and
E1
have been added.
E1
No. OBH768
REVISED EDITION-B

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Summary of Contents for Mitsubishi Electric MUZ-LN35VGHZ

  • Page 1: Table Of Contents

    OBH768A is void. OUTDOOR UNIT No. OBH768 SERVICE MANUAL REVISED EDITION-B utilized Models MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 Indoor unit service manual MSZ-LN•VGW/V/B/R Series (OBH766) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ····························· 3 3.

  • Page 2: Technical Changes

    (12-4.). Revision B: • MUZ-LN25VGHZ2- and MUZ-LN35VGHZ2- have been added. TECHNICAL CHANGES MUZ-LN25VGHZ - MUZ-LN35VGHZ - MUZ-LN50VGHZ - 1. New model MUZ-LN25VGHZ - MUZ-LN25VGHZ2 - MUZ-LN35VGHZ - MUZ-LN35VGHZ2 - 1. The heat exchanger has been changed. 2. The refrigerant amount has been changed.

  • Page 3: 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 4 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 re-calibration.

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-LN25VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ MUZ-LN35VGHZ2 Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet MUZ-LN50VGHZ Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet OBH768B...

  • Page 6: Specification

    SPECIFICATION MUZ- MUZ- MUZ- MUZ- Outdoor model LN25VGHZ LN25VGHZ2 LN35VGHZ LN35VGHZ2 Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.8 - 3.5) 2.5 (0.8 - 3.5) 3.5 (0.8 - 4.0) 3.5 (0.8 - 4.0) Capacity Rated (Min.-Max.) Heating 3.2 (1.0 - 6.3) 3.2 (0.8 - 6.3) 4.0 (1.0 - 6.6)
  • Page 7 Outdoor model MUZ-LN50VGHZ Power supply Single phase, 230 V, 50 Hz Cooling 5.0 (1.4 - 5.8) Capacity Rated (Min. - Max.) Heating 6.0 (1.8 - 8.7) Breaker Capacity Cooling 1,380 Power input *1 (Set) Heating 1,430 Cooling Running current *1 (Set) Heating Cooling Power factor *1 (Set)
  • Page 8 Specifications and rated conditions of main electric parts Model MUZ-LN25VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ MUZ-LN35VGHZ2 Item (C62, C63) 600 µF/ 620 µF 420 V Smoothing capacitor (C61, C62, C63) 600 µF/ 620 µF 420 V (DB61) 15 A 600 V 15 A 600 V...

  • Page 9: Noise Criteria Curves

    NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MUZ-LN35VGHZ2 MUZ-LN35VGHZ FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40...
  • Page 10 MUZ-LN50VGHZ FUNCTION SPL(dB(A)) LINE COOLING HEATING NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 NC-10 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz Test conditions Cooling: Dry-bulb temperature 35°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C OUTDOOR UNIT MICROPHONE OBH768B...

  • Page 11: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-LN25VGHZ MUZ-LN35VGHZ Unit: mm MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 OBH768B...
  • Page 12 MUZ-LN50VGHZ Unit: mm REQUIRED SPACE *1 500 mm or more when front and sides of the unit are clear 417.5 Air in Air in Air out 2-holes 10 21 *2 When any 2 sides of left, right and rear of the unit are clear Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared)

  • Page 13: Wiring Diagram

    WIRING DIAGRAM MUZ-LN25VGHZ MUZ-LN25VGHZ2 OBH768B...
  • Page 14 MUZ-LN35VGHZ MUZ-LN35VGHZ2 OBH768B...
  • Page 15 MUZ-LN50VGHZ OBH768B...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit: mm MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature thermistor Outdoor Muffler RT68 Discharge heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor...
  • Page 17 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid MUZ-LN25VGHZ MUZ-LN35VGHZ 9.52 6.35 MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 MUZ-LN50VGHZ 9.52 6.35 Indoor unit Max. Height difference Max. Length...

  • Page 18: Performance Curves

    PERFORMANCE CURVES MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 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 operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 19 Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 15.1 18.8 14.5 19.1 25.0 13.9 17.4 13.4 17.6 23.1 12.7 15.9 12.3 16.2 21.1 11.6 14.5 11.2 14.7...
  • Page 20 The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz) of compressor (Hz) MUZ-LN35VGHZ Correction of Heating input Correction of Cooling capacity Correction of Cooling input Correction of Heating capacity The operational frequency The operational frequency...
  • Page 21 MUZ-LN50VGHZ Correction of Cooling input Correction of Heating capacity Correction of Heating input Correction of Cooling capacity The operational frequency The operational frequency The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz) of compressor (Hz) 9-3.
  • Page 22 11.6 16.0 1.14 11.4 14.0 1.12 11.2 12.0 1.10 11.0 10.0 1.08 10.8 Ambient temperature(°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) MUZ-LN35VGHZ MUZ-LN35VGHZ2 (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) 1.05 10.5 15.0 1.04 10.4 13.0 1.03 10.3 11.0 1.02 10.2 1.01...
  • Page 23 Outdoor unit current MUZ-LN25VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ MUZ-LN35VGHZ2 Ambient temperature(°C) Ambient temperature(°C) Ambient temperature(°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-LN50VGHZ Ambient temperature(°C) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5...
  • Page 24 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN25VGHZ CAPACITY: 2.5 kW SHF: 0.97 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.32 0.79 2.81 2.22 0.79 2.70 2.13 0.79 2.60 2.05 0.79 3.06...
  • Page 25 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN25VGHZ CAPACITY: 2.5 kW SHF: 0.97 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.94 0.79 2.25 1.78 0.79 2.08 1.64 0.79 2.58 1.73 0.67 2.40 1.61...
  • Page 26 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN25VGHZ2 CAPACITY: 2.5 kW SHF: 0.97 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.32 0.79 2.81 2.22 0.79 2.70 2.13 0.79 2.60 2.05 0.79 3.06...
  • Page 27 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN25VGHZ2 CAPACITY: 2.5 kW SHF: 0.97 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.94 0.79 2.25 1.78 0.79 2.08 1.64 0.79 2.58 1.73 0.67 2.40 1.61...
  • Page 28 Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN35VGHZ CAPACITY: 3.5 kW SHF: 0.90 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.96 0.72 3.94 2.84 0.72 3.78 2.72 0.72 3.64 2.62...
  • Page 29 Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN35VGHZ CAPACITY: 3.5 kW SHF: 0.90 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.47 0.72 3.15 2.27 0.72 2.91 2.09 0.72 3.61 2.16 0.60...
  • Page 30 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN35VGHZ2 CAPACITY: 3.5 kW SHF: 0.90 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.96 0.72 3.94 2.84 0.72 3.78 2.72 0.72 3.64 2.62 0.72 4.29...
  • Page 31 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN35VGHZ2 CAPACITY: 3.5 kW SHF: 0.90 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.47 0.72 3.15 2.27 0.72 2.91 2.09 0.72 3.61 2.16 0.60 3.36 2.02...
  • Page 32 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN50VGHZ CAPACITY: 5.0 kW SHF: 0.77 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.47 0.59 1104 5.63 3.32 0.59 1159 5.40 3.19 0.59 1214 5.20...
  • Page 33 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-LN50VGHZ CAPACITY: 5.0 kW SHF: 0.77 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.89 0.59 1352 4.50 2.66 0.59 1435 4.15 2.45 0.59 1490 5.15 2.42...
  • Page 34 5.08 5.60 2.40 2.88 3.40 3.88 4.40 4.88 5.38 2.16 2.68 3.16 3.68 4.20 4.68 5.20 MUZ-LN35VGHZ CAPACITY: 4.0 kW INPUT: 800 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.52 3.04 3.56 4.08 4.60...

  • Page 35: Actuator Control

    ACTUATOR CONTROL MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 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 36: Service Functions

    SERVICE FUNCTIONS MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 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 37: Troubleshooting

    TROUBLESHOOTING MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 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 then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
  • Page 38 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 39 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 40 NOTE: Blinking patterns of this mode differ from the ones of 3. Outdoor unit failure recall mode table TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit POWER lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C.
  • Page 41 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit POWER lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C. board) mode recall recall function function 10-time blink Discharge temperature...
  • Page 42 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Con- Symptom LED indication Condition Remedy dition 1-time blink every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- 2.5 seconds within 1 minute after the compressor gets started. sor.
  • Page 43 Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 7-time blink Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 12-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •...
  • Page 44 12-4. TROUBLE CRITERION OF MAIN PARTS MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN50VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. Fin temperature board”, for the chart of thermistor.
  • Page 45 12-5. 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 12-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 12-5.
  • Page 46 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>> Refer to 12-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
  • Page 47 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 48 H Check of R.V. coil MUZ-LN25/35VGHZ MUZ-LN25/35VGHZ2 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 49 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 ter- minal of outdoor fan motor normal? (Refer to 12-4.) Disconnect CN932 from the inverter P.C.
  • Page 50 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and press EMERGENCY OPERATION Rectify indoor/outdoor switch. connecting wire. Is there voltage 230VAC Replace the indoor Does POWER lamp on the indoor between the indoor terminal electronic control P.C.
  • Page 51 MSZ-LN25/35VG K Check of LEV (Expansion valve) MSZ-LN50/60VG 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 52 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 12-5. .) Is the fuse (F901) blown on the in- verter 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 53 M How to check miswiring and serial signal error NOTE: Refer to the indoor unit service manual. 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)?
  • Page 54 N Check of the outdoor refrigerant circuit The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop Has the operation stopped during pump down? valve, and disconnect the power plug or turn the breaker OFF. CAUTION: Do not start the operation again to prevent hazards.
  • Page 55 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 56 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-LN25VGHZ MUZ-LN35VGHZ Smoothing Smoothing Smoothing R.V. coil capacitor capacitor capacitor (CN721) Back side of unit DB61 (C63) (C62) 230VAC (C61) 260 - 370VDC Fuse (F701) (LN35VGHZ) T3.15AL250V 230\VAC Fuse (F801) T3.15AL250V...
  • Page 57 MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 R.V.coil Smoothing Smoothing Smoothing (CN721) Back side of unit DB61 capacitor capacitor capacitor (C61) 230 V AC 260 - 370 V DC (C63) (C62) 230 V AC Fuse (F901) Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V T3.15AL250V Fuse (F61) Fuse (F62) 25 A 250V 15 A 250 V...
  • Page 58 MUZ-LN50VGHZ Jumper wire for pre-heat control setting (JK) LEV (CN724) Jumper wire for changing defrost setting (JS) Ambient temperature thermistor/RT65 (CN672) Heater (CN601) 230VAC Outdoor heat exchanger temperature thermistor R.V. coil (CN602) /RT68 (CN671) 230VAC Discharge temperature thermistor/RT62 (CN671) Defrost thermistor /RT61 (CN671) Fuse (F601) Fin temperature...

  • Page 59: Disassembly Instructions

    Locking lever lever. Connector 13-1. MUZ-LN25VGHZ MUZ-LN35VGHZ MUZ-LN25VGHZ2 MUZ-LN35VGHZ2 NOTE: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos. : Indicates the invisible parts in the photos. OPERATING PROCEDURE PHOTOS/FIGURES 1.
  • Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 4 Screw of the P.B. support board and the separator (1) Remove the cabinet and panels. (Refer to 1.) Screws of Screw of the heat sink (2) Disconnect the lead wire to the reactor and the following con- the terminal block support and the separator nectors:...
  • Page 61 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R.V. coil Photo 7 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: Outdoor heat <Inverter P.C. board> exchanger tempera- CN721 (R.V. coil) ture thermistor (3) Remove the R.V. coil. 4.
  • Page 62 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 9 (1) Remove the cabinet and panels. (Refer to 1.) Discharge pipe Suction pipe (2) Remove the inverter assembly. (Refer to 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 63 13-2. MUZ-LN50VGHZ 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 64 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 3 Screws of the relay panel board Inverter P.C board (1) Remove the cabinet and the service panel. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 65 OPERATING PROCEDURE PHOTOS 3. Removing R.V. coil Photo 5 Screw of (1) Remove the cabinet and panels. (Refer to 1.) the R.V. coil (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (3) Remove the R.V. coil. Brazed parts of 4-way valve 4.
  • Page 66 Brazed part of thermistor the suction pipe HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2019. No. OBH768 REVISED EDITION-B Issued: Mar. 2018. No. OBH768 REVISED EDITION-A Published: Feb. 2017. No. OBH768 Specifications are subject to change without notice.

This manual is also suitable for:

Muz-ln25vghzMuz-ln50vghzMuz-ln25vghz2Muz-ln35vghz2

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