Mitsubishi Electric MUZ-GE25VAH Service Manual

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Manual (586 pages)

Operating instructions manual (112 pages)

Service manual (70 pages)

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OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-GE25VA -

MUZ-GE25VAH -

MUZ-GE35VA -

MUZ-GE35VAH -

MUZ-GE42VA -

MUZ-GE42VAH -

MUZ-GE25VA

MUZ-GE35VA

MUZ-GE42VA

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

Revision C:

• The compressor winding resistance for

MUZ-GE71VA -

Please void OBH516 REVISED EDITION-B.

HFC

utilized

R410A

MUZ-GE50VA -

MUZ-GE50VAH -

MUZ-GE60VA -

MUZ-GE71VA -

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVES ······························ 7

5. OUTLINES AND DIMENSIONS ························ 9

6. WIRING DIAGRAM ···········································11

7. REFRIGERANT SYSTEM DIAGRAM ············· 18

8. PERFORMANCE CURVES ····························· 21

9. ACTUATOR CONTROL ··································· 40

10. SERVICE FUNCTIONS ···································· 41

11. TROUBLESHOOTING ····································· 41

12. DISASSEMBLY INSTRUCTIONS ···················· 61

PARTS CATALOG (OBB516)

has been changed.

No. OBH516

REVISED EDITION-C

Indoor unit service manual

MSZ-GE•VA Series (OBH515)

MSZ-CGE•VA Series (OBH523)

Table of Contents

Troubleshooting

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Summary of Contents for Mitsubishi Electric MUZ-GE25VAH

Page 1: Table Of Contents
Please void OBH516 REVISED EDITION-B. OUTDOOR UNIT No. OBH516 SERVICE MANUAL REVISED EDITION-C utilized R410A Models MUZ-GE25VA - MUZ-GE50VA - MUZ-GE25VAH - MUZ-GE50VAH - MUZ-GE35VA - MUZ-GE60VA - MUZ-GE35VAH - MUZ-GE71VA - MUZ-GE42VA - MUZ-GE42VAH - Indoor unit service manual MSZ-GE•VA Series (OBH515) MSZ-CGE•VA Series (OBH523)
Page 2: Revision C
Revision A: • MUZ-GE42VA - , MUZ-GE42VAH - , MUZ-GE50VA - and MUZ-GE50VAH - have been added. Revision B: • MUZ-GE60VA - and MUZ-GE71VA - have been added. Revision C: • The compressor winding resistance for MUZ-GE71VA - has been changed.
Page 3: Technical Changes
TECHNICAL CHANGES MUZ-GE25VA - MUZ-GE25VAH - MUZ-GE35VA - MUZ-GE35VAH - MUZ-GE42VA - MUZ-GE42VAH - MUZ-GE50VA - MUZ-GE50VAH - MUZ-GE60VA - MUZ-GE71VA - 1. New model...
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-GE50VA MUZ-GE50VAH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet (GE50VA) MUZ-GE60VA MUZ-GE71VA Air inlet...
Page 5: Specification
SPECIFICATION MUZ- MUZ- MUZ- MUZ- GE25VA GE35VA GE42VA GE50VA MUZ- MUZ- Outdoor model MUZ- MUZ- MUZ- MUZ- GE60VA GE71VA GE25VAH GE35VAH GE42VAH GE50VAH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.1 - 3.5) 3.5 (1.1 - 4.0) 4.2 (0.9 - 4.8) 5.0 (1.4 - 5.5) 6.0 (1.5 - 7.5) 7.1 (2.4 - 8.7) Capacity Rated frequency (Min.-Max.) Heating...
Page 6 Speciﬁ cations and rating conditions of main electric parts Model MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Item GE25VA GE25VAH GE35VA GE35VAH GE42VA GE42VAH GE50VA GE50VAH GE60VA GE71VA Current (CT) 20 A — transformer (C61, C62, C63) 620 μF 420 V —...
Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH 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 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
Page 8 MUZ-GE60VA MUZ-GE71VA 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 NC-40 NC-30 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 Test conditions Cooling: Dry-bulb temperature 35°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C...
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH Unit: mm MUZ-GE42VA MUZ-GE42VAH REQUIRED SPACE 100 mm or more Drain hole ø42 (MUZ-GE25/35/42VA) Drain hole ø33 (MUZ-GE25/35/42VAH) Air in Air in 2 holes 10 X 21 Service panel Air out 22.3 Liquid refrigerant pipe joint Handle Refrigerant pipe (flared) ø6.35...
Page 10 MUZ-GE60VA MUZ-GE71VA Unit: mm REQUIRED SPACE 500 mm or more 417.5 Air in 100 mm or more Air out 2-holes 10 21 500 mm or more Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) 6.35 (MUZ-GE60VA) Ø 9.52 (MUZ-GE71VA) Ø...
Page 11: Wiring Diagram
WIRING DIAGRAM MUZ-GE25VA MUZ-GE35VA...
Page 12 MUZ-GE25VAH MUZ-GE35VAH...
Page 13 MUZ-GE42VA...
Page 14 MUZ-GE42VAH...
Page 15 MUZ-GE50VA...
Page 16 MUZ-GE50VAH...
Page 17 MUZ-GE60VA MUZ-GE71VA...
Page 18: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-GE25VA MUZ-GE25VAH Unit: mm 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 exchanger temperature thermistor RT62 Ambient Compressor temperature...
Page 19 MUZ-GE50VA MUZ-GE50VAH Unit: mm Muffler Refrigerant pipe ø 12.7 #100 4-way valve (with heat insulator) Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat exchanger temperature thermistor RT68...
Page 20: Cooling
MUZ-GE71VA Unit: mm Muffler Refrigerant pipe ø 15.88 #100 4-way valve (with heat insulator) Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection...
Page 21: Performance Curves
PERFORMANCE CURVES MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH MUZ-GE60VA MUZ-GE71VA 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 22 Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 18.2 22.7 27.0 26.2 19.9 25.3 16.8 21.0 24.9 24.1 18.4 23.4 15.4 19.2 22.8 22.1 16.9 21.4 14.0...
Page 23: Muz-Ge50Va Muz-Ge50Vah
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-GE25VA MUZ-GE25VAH Correction of Heating input Correction of Cooling capacity Correction of Cooling input Correction of Heating capacity The operational frequency The operational frequency The operational frequency The operational frequency...
Page 24: Cool Operation
Relative humidity (%) Both indoor and outdoor unit are under the same temperature/ humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) Outdoor low pressure MUZ-GE25VA MUZ-GE35VA MUZ-GE42VA MUZ-GE25VAH MUZ-GE35VAH MUZ-GE42VAH (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) Ambient temperature(°C)
Page 25: Muz-Ge50Va Muz-Ge50Vah
The unit of pressure has been changed to MPa on the international system of units (SI unit system) The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm [Gauge]) Outdoor unit current MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Ambient temperature (°C) Ambient temperature (°C)
Page 26: Muz-Ge50Va Muz-Ge50Vah
Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 Operation: Test run operation (Refer to 8-3.) Outdoor unit current MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Ambient temperature (°C) Ambient temperature (°C) Ambient temperature(°C) MUZ-GE50VA MUZ-GE50VAH MUZ-GE60VA MUZ-GE71VA Ambient temperature (°C)
Page 27 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE25VA MUZ-GE25VAH CAPACITY: 2.5 kW SHF: 0.96 INPUT: 545 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.29 0.78 2.81 2.19 0.78 2.70 2.11 0.78 2.60...
Page 28 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE25VA MUZ-GE25VAH CAPACITY: 2.5 kW SHF: 0.96 INPUT: 545 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.91 0.78 2.25 1.76 0.78 2.08 1.62 0.78 2.58 1.70...
Page 29 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE35VA MUZ-GE35VAH CAPACITY: 3.5 kW SHF: 0.82 INPUT: 865 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.63 0.64 3.94 2.52 0.64 3.78 2.42 0.64 3.64 2.33 0.64...
Page 30 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE35VA MUZ-GE35VAH CAPACITY: 3.5 kW SHF: 0.82 INPUT: 865 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.20 0.64 3.15 2.02 0.64 2.91 1.86 0.64 3.61 1.87 0.52 3.36...
Page 31 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE42VA MUZ-GE42VAH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1215 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.91 0.59 4.73 2.79 0.59 1021 4.54 2.68 0.59 1069 4.37...
Page 32 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE42VA MUZ-GE42VAH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1215 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.43 0.59 1191 3.78 2.23 0.59 1264 3.49 2.06 0.59 1312 4.33...
Page 33: Muz-Ge50Va Muz-Ge50Vah
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE50VA MUZ-GE50VAH CAPACITY: 5.0 kW SHF: 0.76 INPUT: 1515 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.41 0.58 1212 5.63 3.26 0.58 1273 5.40 3.13 0.58 1333...
Page 34: Muz-Ge50Va Muz-Ge50Vah
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE50VA MUZ-GE50VAH CAPACITY: 5.0 kW SHF: 0.76 INPUT: 1515 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.84 0.58 1485 4.50 2.61 0.58 1576 4.15 2.41 0.58 1636 5.15...
Page 35 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE60VA CAPACITY: 6.0 kW SHF: 0.79 INPUT: 1760 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 7.05 4.30 0.61 1408 6.75 4.12 0.61 1478 6.48 3.95 0.61 1549 6.24...
Page 36 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE60VA CAPACITY: 6.0 kW SHF: 0.79 INPUT: 1760 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 5.88 3.59 0.61 1725 5.40 3.29 0.61 1830 4.98 3.04 0.61 1901 6.18 3.03...
Page 37 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE71VA CAPACITY: 7.1 kW SHF: 0.78 INPUT: 2130 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 8.34 5.01 0.60 1704 7.99 4.79 0.60 1789 7.67 4.60 0.60 1874 7.38...
Page 38 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-GE71VA CAPACITY: 7.1 kW SHF: 0.78 INPUT: 2130 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 6.96 4.17 0.60 2087 6.39 3.83 0.60 2215 5.89 3.54 0.60 2300 7.31 3.51...
Page 39 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-GE25VA MUZ-GE25VAH CAPACITY: 3.2 kW INPUT: 700 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.92 2.30 2.72 3.10 3.52 3.90...
Page 40: Actuator Control
ACTUATOR CONTROL MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH MUZ-GE60VA MUZ-GE71VA 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.
Page 41: Service Functions
SERVICE FUNCTIONS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH MUZ-GE60VA MUZ-GE71VA 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.)
Page 42: Failure Mode Recall Function
11-2. 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 (11-3.) disappears, the memorized failure details can be recalled. 1.
Page 43 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Conﬁ rm if outdoor unit is abnormal according to the following procedures. Conﬁ rm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO 1.
Page 44 3. Outdoor unit failure mode table The upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Correspondence failure mode INDICATOR (Failure mode / protection) (Outdoor P.C. board) mode recall recall function lamp function (Indoor unit) None (Normal) —...
Page 45: Troubleshooting Check Table
11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Correspondence Condition Outdoor unit 1-time ﬂ ash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor.
Page 46: Muz-Ge50Va Muz-Ge50Vah
11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH MUZ-GE60VA MUZ-GE71VA Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.
Page 47: Cooling
11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). Check the voltage between terminals. See 11-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 11-5.
Page 48: Heating
D Check of compressor winding ●Disconnect the connector between the compressor and intelligent power module, 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 49 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor 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 50: Muz-Ge50Va Muz-Ge50Vah
I Check of outdoor fan motor MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? Replace the outdoor fan motor.
Page 51: Muz-Ge50Va Muz-Ge50Vah
J Check of power supply MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH Disconnect the connector between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does The upper lamp of...
Page 52 K Check of LEV (Expansion valve) MUZ-GE25VA MUZ-GE42VA MUZ-GE60VA MUZ-GE35VA MUZ-GE50VA MUZ-GE71VA Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button (MSZ-GE25/35/42/50VA)/ TEMP button (MSZ-GE60/71VA) on the remote controller at the same time, press RESET button. First, release RESET button.
Page 53 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5. .) 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.
Page 54 M How to check miswiring and serial signal error MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Check the wiring.
Page 55 MUZ-GE60VA MUZ-GE71VA Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press EMERGENCY OPERATION switch once. Does the upper lamp of OPERATION INDICA- TOR lamp light up? <Conﬁ...
Page 56 N 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 O Check of defrost heater MUZ-GE•VAH 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 58 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Smoothing Smoothing Smoothing Heater capacitor capacitor capacitor Fuse (F701) DB61 connector Back side of unit (C63) (C62) (C61) T3.15AL250V 280 - 370 VDC (CN722) MUZ-GE•VAH...
Page 59 MUZ-GE50VA MUZ-GE50VAH Smoothing Smoothing Smoothing Back side of unit R.V.coil capacitor capacitor capacitor Fuse (F701) (CN721) DB61 (C63) (C62) (C61) T3.15AL250V 230 VAC 280 - 370 VDC Fuse (F801) Heater connector 230 VAC T3.15AL250V (CN722) MUZ-GE•VAH Fuse (F901) T3.15AL250V Output to drive compressor 230 VAC...
Page 60 MUZ-GE60VA MUZ-GE71VA Fuse (F62) Fuse (F601) R.V. coil (CN602) T2.0AL250V T3.15AL250V 230VAC Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Signal of out- Defrost thermistor door fan motor /RT61 (CN671) (CN931) Discharge temperature thermistor/RT62 (CN671) Outdoor heat exchanger temperature thermistor...
Page 61: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel.
Page 62 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- Screws of the nectors: relay panel <Inverter P.C.
Page 63 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) Outdoor heat (2) Disconnect the following connectors: exchanger tempera- <Inverter P.C. board> ture thermistor CN932 (Fan motor) (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller.
Page 64 12-2. MUZ-GE50VA MUZ-GE50VAH NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screw of the top panel Screws of the cabinet (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
Page 65 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screws of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
Page 66 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
Page 67 12-3. MUZ-GE60VA MUZ-GE71VA NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 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 68 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel (2) Disconnect the lead wire to the reactor and the following con- Screws of the nectors: PB support Earth wires...
Page 69 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
Page 70 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2008 MITSUBISHI ELECTRIC CO.,LTD Distributed in Jun. 2010. No. OBH516 REVISED EDITION-C 5 Distributed in Oct. 2009. No. OBH516 REVISED EDITION-B 5 Distributed in Dec. 2008. No. OBH516 REVISED EDITION-A 5 New publication, effective Jun.

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