Mitsubishi MUH-GA50VB Service Manual
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Mitsubishi MUH-GA50VB Service Manual

Split-type air conditioners
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SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models
MUH-GA50VB -
MUH-GA50VB -
MUH-GA60VB -
MUH-GA80VB -
NOTE:
This service manual describes technical data of outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
E1
E2
E1
E1
CONTENTS
10. TROUBLESHOOTING······································25
MUH-GA50VB
11. DISASSEMBLY INSTRUCTIONS·····················36
12. PARTS LIST······················································40
13. RoHS PARTS LIST···········································46
Revision:C
• The fan guard for MUH-GA60VB-
MUH-GA80VB-
Please void OB368 REVISED EDITION-B.
HFC
utilized
R410A
Indoor unit service manual
MSH-GA•VB Series (OB367)
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES ·······························8
5. OUTLINES AND DIMENSIONS ·························9
6. WIRING DIAGRAM ··········································10
7. REFRIGERANT SYSTEM DIAGRAM ··············12
8. PERFORMANCE CURVES ······························15
9. SERVICE FUNCTIONS ····································25
E1
has been changed.
E1
No. OB368
REVISED EDITION-C
and

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Summary of Contents for Mitsubishi MUH-GA50VB

  • Page 1: Table Of Contents

    Please void OB368 REVISED EDITION-B. OUTDOOR UNIT No. OB368 SERVICE MANUAL utilized REVISED EDITION-C R410A Models MUH-GA50VB - MUH-GA50VB - MUH-GA60VB - MUH-GA80VB - Indoor unit service manual MSH-GA•VB Series (OB367) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3.

  • Page 2: Technical Changes

    Revision:A • RoHS PARTS LIST has been added. Revision:B • MUH-GA50VB- has been added. Revision:C • The fan guard for MUH-GA60VB- and MUH-GA80VB- has been changed. TECHNICAL CHANGES ➔MUH-GA50VB - MUH-A18WV - 1. Oil separator has been removed. 2. Model name has been changed.
  • Page 3 New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigeration oil backs to the compressor through the lower Raising position of the oil back hole enables to back the position oil back hole.
  • Page 4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Wall Pipe Insulation material thickness 0.8 mm 6.35 For liquid Heat resisting foam plastic 9.52 0.8 mm Specific gravity 0.045 Thickness 8 mm 0.8 mm 12.7 For gas 1.0 mm...

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS MUH-GA50VB MUH-GA60VB MUH-GA80VB Air inlet Air inlet (back and side) (back and side) Piping Drainage hose Air outlet Air outlet Drain outlet ACCESSORIES MUH-GA60VB MUH-GA50VB MUH-GA80VB Drain socket Drain cap {33 Drain cap {16 —...

  • Page 6: Specification

    SPECIFICATION Outdoor model MUH-GA50VB MUH-GA60VB Cooling Cooling Heating Heating Function Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Dehumidification — — Air flow(High) 2,196 K /h 2,760 Power outlet 10.39 Running current 7.93 7.23 10.70 2,350 Power input...
  • Page 7 Outdoor model MUH-GA80VB Cooling Heating Function Single phase Power supply 230V, 50Hz Capacity Dehumidification — Air flow(High/Low) K /h 2,940/1,470 2,940/1,470 Power outlet Running current 14.42 15.19 Power input 3,191 3,361 Power factor Starting current Compressor motor current 13.85 14.62 Fan motor current 0.57 Coefficient of performance(C.O.P)

  • Page 8: Noise Criteria Curves

    NOISE CRITERIA CURVES MUH-GA50VB MUH-GA60VB FAN SPEED SPL(dB(A)) LINE FAN SPEED SPL(dB(A)) LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUH-GA50VB Unit: mm REQUIRED SPACE Drainage hole [16.2 Air in Air in Drainage Air out 3holes [33 Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) [12.7 MUH-GA60VB MUH-GA80VB...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MUH-GA50VB 21S4 RT61 INDOOR UNIT CN661 CN721 1 2 3 4 CONNECTING CN711 CIRCUIT BREAKER SR61 POWER SUPPLY 230V 50Hz TAB20 DEICER P.C. BOARD SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) TB1,TB2...
  • Page 11 MUH-GA80VB RT61 RT62 RT63 CIRCUIT BREAKER CN711 CN661 CN662 CN724 1 2 3 CN721 SR62 21S4 SR61 TAB52 CN730 DEICER NR61 P.C. BOARD SYMBOL SYMBOL NAME SYMBOL NAME NAME CZ SURGE ABSORBER OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK COMPRESSOR CAPACITOR NR61 TERMINAL BLOCK VARISTOR...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUH-GA50VB - Unit:mm Refrigerant pipe [12.7 4- way valve (with heat insulator) Stop valve Outdoor (with service port) Muffler heat Defrost Flared connection exchanger thermistor RT61 Compressor Capillary tube [3.0o[1.6o750 Flared connection (2 pcs) Capillary tube [3.0o[1.6o450 R.V.
  • Page 13 MUH-GA60VB Unit:mm Refrigerant pipe [15.88 4- way valve (with heat insulator) Stop valve (with service port) Muffler Outdoor Flared connection Muffler heat #100 exchanger Defrost Compressor thermistor RT61 Flared connection Capillary tube [3.0X[2.0X750 Receiver R.V. coil Stop valve Capillary tube Strainer Heating ON [3.0X[2.0X750...
  • Page 14 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Model Max. length : m Liquid MUH-GA50VB 12.7 6.35 MUH-GA60VB 15.88 MUH-GA80VB 9.52 MAX. HEIGHT DIFFERENCE Indoor unit wMax. Height difference: Refrigerant Piping 10m(MSH-GA50/GA60VB)/ Max. Length 15m(MSH-GA80VB) Outdoor unit w Height difference should be within 10m(MSH-GA50VB/GA60VB)/ 15m(MSH-GA80VB) regardless of which unit, indoor or outdoor position is high.

  • Page 15: Performance Curves

    PERFORMANCE CURVES MUH-GA50VB MUH-GA60VB MUH-GA80VB 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 16 2 2 Air flow should be set at MAX. 3 3 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/f f [Gauge]) (kgf/F[Gauge])(MPa[Gauge]) MUH-GA50VB MUH-GA50VB 230V 230V 35(:)

  • Page 17: Heat Operation

    70(%) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C MUH-GA50VB MUH-GA60VB 230V 230V Ambient temperature(˚C) Ambient temperature(˚C) MUH-GA80VB 230V Ambient temperature(˚C)
  • Page 18 PERFORMANCE DATA COOL operation MSH-GA50VB : MUH-GA50VB (230V) CAPACITY : 5.0(kW) SHF : 0.65 INPUT : 1780(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.88 2.76 0.47 1424 5.63 2.64 0.47 1495 5.40 2.54 0.47...
  • Page 19 PERFORMANCE DATA COOL operation MSH-GA50VB : MUH-GA50VB (230V) CAPACITY : 5.0(kW) SHF : 0.65 INPUT : 1780(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.30 0.47 1744 4.50 2.12 0.47 1851 4.33 2.03 0.47...
  • Page 20 PERFORMANCE DATA COOL operation MSH-GA60VB : MUH-GA60VB (230V) CAPACITY : 6.3(kW) SHF : 0.64 INPUT : 2410(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 7.40 3.41 0.46 1928 7.09 3.26 0.46 2024 6.80 3.13 0.46 2121...
  • Page 21 PERFORMANCE DATA COOL operation MSH-GA60VB : MUH-GA60VB (230V) CAPACITY : 6.3(kW) SHF : 0.64 INPUT : 2410(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.17 2.84 0.46 2362 5.67 2.61 0.46 2506 5.45 2.51 0.46 2555 6.49 2.21 0.34...
  • Page 22 PERFORMANCE DATA COOL operation MSH-GA80VB : MUH-GA80VB (230V) CAPACITY : 8.5(kW) SHF : 0.62 INPUT : 3260(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 9.99 4.39 0.44 2608 9.56 4.21 0.44 2738 9.18 4.04 0.44 2869...
  • Page 23 PERFORMANCE DATA COOL operation MSH-GA80VB : MUH-GA80VB (230V) CAPACITY : 8.5(kW) SHF : 0.62 INPUT : 3260(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 8.33 3.67 0.44 3195 7.65 3.37 0.44 3390 7.35 3.24 0.44 3456 8.76 2.80 0.32...
  • Page 24 PERFORMANCE DATA HEAT operation MSH-GA50VB : MUH-GA50VB (230V) CAPACITY : 5.2(kW) INPUT : 1610(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.28 1047 3.95 1256 4.63 1417 5.30 1530 5.98 1626 6.60 1674 7.28 1707 3.12 1127 3.74...

  • Page 25: Service Functions

    MUH-GA50VB MUH-GA60VB MUH-GA80VB 9-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JPDS and JPSG(MUH-GA50VB)/ JPG1 and R871(MUH-GA60/GA80VB) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to 10-5.) Defrost thermistor RT61 must read below -3°C.
  • Page 26 10-2. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit lamp on the indoor unit is Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller. normally. operate.
  • Page 27 10-3. TROUBLE CRITERION OF MAIN PARTS MUH-GA50VB MUH-GA60VB MUH-GA80VB Part name Check method and criterion Figure Measure the resistance with a tester. (Part temperature –10˚C ~ 40˚C) Defrost thermistor (RT61) Refer to 10-5. "Test point diagram and voltage", "Outdoor deicer P.C. board", the chart of thermistor.

  • Page 28: Troubleshooting Flow

    10-4. TROUBLESHOOTING FLOW Compressor and/or outdoor fan motor doesn’t operate. A A Check of outdoor unit MUH-GA50VB Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes.
  • Page 29 MUH-GA60VB MUH-GA80VB Turn ON the power supply. Is there 230V AC to Check the outdoor power supply between on the and connection of wiring. outdoor terminal block Compressor does not operate. Is there 5V DC between Is there 230V AC between Rectify the connecting J101 - J401...
  • Page 30 EMERGENCY OPERATION switch. After 3 minutes, does the unit operate in HEAT mode? Is there 230V AC between CN7211 – 2 (MUH-GA50VB)/ Replace the R.V. coil. CN7211 – 3 (MUH-GA60/GA80VB) on the deicer P.C. board? Replace the...

  • Page 31: How To Check Mis-Wiring

    Check the outdoor power supply and connection of wiring. on the outdoor terminal block? Is there 5V DC between J205 + -J101 - (MUH-GA50VB)/ J101 + -J401 - (MUH-GA60/GA80VB) on the deicer P.C. Replace the deicer P.C. board. board?(Refer to 10-5.)

  • Page 32: Check Of Lev (Expansion Valve)

    When OPERATION INDICATOR lamp flashes 10-time. Heating/ Cooling doesn't operate. Check of LEV (Expansion valve) MUH-GA80VB Turn ON the power supply. 1 During pressing both the OPERATION SELECT button and the TOO COOL button on the remote controller at the same time, press the RESET button.

  • Page 33: Check Of Outdoor Thermistor

    When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal. Check of outdoor thermistor w Disconnect the connectors CN661 and/ or CN662 from the deicer P.C. board. (Check the characteristics of each thermistor.) Defrost thermistor(RT61) Measure resistance between CN 661 1 and 2.
  • Page 34 10-5. TEST POINT DIAGRAM AND VOLTAGE MUH-GA50VB Outdoor deicer P.C. board CN711 CN721 Power supply input Outdoor fan motor R.V. coil 230V AC 230V AC 230V AC NR61 Varistor Fuse 2A/250V R601 5~10V DC Defrost interval time short pin (JPDS, JPSG) (Refer to 9-1.)
  • Page 35 MUH-GA60VB MUH-GA80VB Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) Discharge temperature thermistor(RT62) -20 -10 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) Temperature(:) CN661 1-2 <MUH-GA80VB> <MUH-GA80VB>...

  • Page 36: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 11-1. MUH-GA50VB OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the down of the cabinet on the both side and remove the cabinet.
  • Page 37 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) Photo 4 Set screws of the (2) Remove the propeller nut and the propeller. outdoor fan motor Propeller NOTE : Loose the propeller in the rotating direction for Lead clamps removal.
  • Page 38 11-2. MUH-GA60VB MUH-GA80VB NOTE : These photos are MUH-GA80VB. OUTDOOR UNIT MUH-GA60VB is almost the same as MUH-GA80VB. OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 Screw of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 39 OPERATING PROCEDURE PHOTOS 3. Removing the propeller and the outdoor fan motor Photo 5 (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE : Loose the propeller in the rotating direction for Set screws of the removal.

  • Page 40: Parts List

    PARTS LIST (non-RoHS compliant) MUH-GA50VB 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 12-2. ACCESSORY...
  • Page 41 ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MUH-GA50VB - Diagram E02 817 233 BACK PANEL E02 817 232 CABINET E02 817 521 GRILLE...
  • Page 42 PARTS LIST (non-RoHS compliant) MUH-GA60VB 12-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 12-4. ACCESSORY...
  • Page 43 PARTS LIST (non-RoHS compliant) MUH-GA60VB 12-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part No. Part Name MUH-GA60VB - Diagram E02 819 297 TOP PANEL E02 821 630 OUTDOOR HEAT EXCHANGER...
  • Page 44 PARTS LIST (non-RoHS compliant) MUH-GA80VB 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 12-6. ACCESSORY...
  • Page 45 PARTS LIST (non-RoHS compliant) MUH-GA80VB 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Remarks Part No. Part Name in Wiring MUH-GA80VB - Diagram E02 819 297 TOP PANEL E02 819 309 THERMISTOR...

  • Page 46: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MUH-GA50VB 13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 13-2. ACCESSORY...
  • Page 47 E02 336 385 NR61 VARISTOR E02 B36 299 OIL SEPARATOR 13-2. ACCESSORY Q'ty/unit Symbol in Wiring Remarks Part No. Part Name MUH-GA50VB - Diagram E12 817 704 DRAIN SOCKET [33 2PCS/ SET E12 444 705 DRAIN CAP E12 444 706 DRAIN CAP...
  • Page 48 RoHS PARTS LIST (RoHS compliant) MUH-GA60VB 13-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 13-4. ACCESSORY...
  • Page 49 RoHS PARTS LIST (RoHS compliant) MUH-GA60VB 13-3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Remarks Part No. Part Name MUH-GA60VB - Diagram E12 819 297 TOP PANEL E12 821 630 OUTDOOR HEAT EXCHANGER...
  • Page 50 RoHS PARTS LIST (RoHS compliant) MUH-GA80VB 13-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 13-6. ACCESSORY...
  • Page 51 RoHS PARTS LIST (RoHS compliant) MUH-GA80VB 13-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name Remarks in Wiring MUH-GA80VB - Diagram E02 819 297 TOP PANEL E02 819 309 THERMISTOR...
  • Page 52 HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jun. 2010. No.OB368 REVISED EDITION-C 5 Distributed in May 2007. No.OB368 REVISED EDITION-B 6 Distributed in Jun. 2006. No.OB368 REVISED EDITION-A 6 New publication, effective Jun.

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