Mitsubishi MUZ-GE25VA Service Manual
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Mitsubishi MUZ-GE25VA Service Manual

Outdoor unit
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SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models
MUZ-GE25VA -
MUZ-GE35VA -
MUZ-GE42VA -
MUZ-GE50VA -
MUZ-GE25/35/42VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• MUZ-GE42/50VA(H) -
Please void OBH516.
HFC
utilized
R410A
E1
E1
E1
E1
E1
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 15
8. PERFORMANCE CURVES ····························· 17
9. ACTUATOR CONTROL ··································· 31
10. SERVICE FUNCTIONS ···································· 32
11. TROUBLESHOOTING ····································· 32
12. DISASSEMBLY INSTRUCTIONS ···················· 50
PARTS CATALOG (OBB516)
has been added.
E1
No. OBH516
REVISED EDITION-A
Indoor unit service manual
MSZ-GE•VA Series (OBH515)
MSZ-CGE•VA Series (OBH523)

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Summary of Contents for Mitsubishi MUZ-GE25VA

  • Page 1: Table Of Contents

    Please void OBH516. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH516 SERVICE MANUAL REVISED EDITION-A utilized R410A Models MUZ-GE25VA - MUZ-GE25VAH - MUZ-GE35VA - MUZ-GE35VAH - MUZ-GE42VA - MUZ-GE42VAH - MUZ-GE50VA - Indoor unit service manual MUZ-GE50VAH - MSZ-GE•VA Series (OBH515) MSZ-CGE•VA Series (OBH523)
  • Page 2 Revision A: • MUZ-GE42/50VA(H) - has been added.

  • Page 3: Muz-Ge25Vah

    TECHNICAL CHANGES MUZ-GE25VA - MUZ-GE25VAH - MUZ-GE35VA - MUZ-GE35VAH - MUZ-GE42VA - MUZ-GE42VAH - MUZ-GE50VA - MUZ-GE50VAH - 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) ACCESSORIES MUZ-GE25/35/42VA MUZ-GE50VA...

  • Page 5: Specification

    SPECIFICATION MUZ-GE25VA MUZ-GE35VA MUZ-GE42VA MUZ-GE50VA Outdoor model MUZ-GE25VAH MUZ-GE35VAH MUZ-GE42VAH MUZ-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) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.3 - 4.5)
  • Page 6 Specifi cations and rating conditions of main electric parts Model MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Item GE25VA GE25VAH GE35VA GE35VAH GE42VA GE42VAH GE50VA GE50VAH (CT) 20 A Current transformer (CT761, CT781) 15 A Smoothing (C61, C62, C63) 620 μF 420 V capacitor (DB61)

  • 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: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH Unit: mm MUZ-GE42VA MUZ-GE42VAH REQUIRED SPACE Basically open 100 mm or more without any obstruction in front and on both sides of the unit. Drain hole ø42 (25/35/42VA) Drain hole ø33 (25/35/42VAH) Air in...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM MUZ-GE25VA MUZ-GE35VA...
  • Page 10 MUZ-GE25VAH MUZ-GE35VAH...
  • Page 11 MUZ-GE42VA...
  • Page 12 MUZ-GE42VAH...
  • Page 13 MUZ-GE50VA...
  • Page 14 MUZ-GE50VAH...

  • Page 15: 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 16 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 17: Performance Curves

    PERFORMANCE CURVES MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH 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 18 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 16.8 21.0 24.9 24.1 15.4 19.2 22.8 22.1 14.0 17.5 20.7 20.1 12.6 15.7 18.7...
  • Page 19 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 20: 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 8-3.) Outdoor low pressure MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Ambient temperature(°C) Ambient temperature(°C) Ambient temperature(°C)

  • Page 21: Heat Operation

    Outdoor unit current MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH Ambient temperature (°C) Ambient temperature (°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-GE50VA MUZ-GE50VAH Ambient temperature (°C) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0...
  • Page 22 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 23 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 24 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 25 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 26 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 27 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 28 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 29 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 30 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 31: Actuator Control

    ACTUATOR CONTROL MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH 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 32: Service Functions

    SERVICE FUNCTIONS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH 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.) Defrost fi nish temperature (°C)
  • Page 33 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 34 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. 1.
  • Page 35 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 36 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 37 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-GE25VA MUZ-GE25VAH MUZ-GE35VA MUZ-GE35VAH MUZ-GE42VA MUZ-GE42VAH MUZ-GE50VA MUZ-GE50VAH 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 38 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) 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.
  • Page 39 D Check of compressor winding ●Disconnect the connector (CN61) 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 40 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 41 I Check of outdoor fan motor MUZ-GE25/35/42 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. (Refer to 11-4.) Replace the inverter P.C. board. MUZ-GE50 Check the connection between the connector CN931 and CN932.
  • Page 42 J Check of power supply Disconnect the connector (CN61) 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 Is there voltage 230 VAC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal electronic control P.C.
  • Page 43 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds.
  • Page 44 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 45 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
  • Page 46 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 47 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 48: Muz-Ge42Va Muz-Ge42Vah

    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) 250 V 3.15 A DC 260 - 300 V (CN722) MUZ-GE•VAH...
  • Page 49 MUZ-GE50VA MUZ-GE50VAH Smoothing Smoothing Smoothing R.V.coil capacitor capacitor capacitor Fuse (F701) (CN721) DB61 Back side of unit (C63) (C62) (C61) 250 V 3.15 A 230 VAC DC 260 ~300 V Fuse (F801) Heater connector AC 230 V 250 V 3.15 A (CN722) MUZ-GE•VAH Fuse (F901)

  • Page 50: 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 51 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 52 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 53 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 54 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 55 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 56 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2008 MITSUBISHI ELECTRIC CO.,LTD Distributed in Dec. 2008. No. OBH516 REVISED EDITION-A 5 New publication, effective Dec. 2008 Distributed in Aug. 2008. No. OBH516 6 Specifications subject to change without notice.

This manual is also suitable for:

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