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Mitsubishi Electric MU-GA50VB Service Manual
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Mitsubishi Electric MU-GA50VB Service Manual

Mitsubishi Electric MU-GA50VB Service Manual

Split-type, air conditioners wireless type models
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SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MU-GA50VB -
MU-GA60VB -
MU-GA80VB -
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MS-GA50VB -
manual OB369.
E1
E1
E1
Indication of model name
MU-GA50VB -
E1
, MS-GA60VB -
E1
E1
HFC
utilized
R410A
CONTENTS
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. TROUBLESHOOTING······································23
10. DISASSEMBLY INSTRUCTIONS·····················30
11. PARTS LIST······················································36
and MS-GA80VB -
, refer to the service
E1
No. OB370

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  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR CONDITIONERS No. OB370 utilized SERVICE MANUAL R410A Wireless type Models MU-GA50VB - MU-GA60VB - MU-GA80VB - CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. SPECIFICATION·················································6 4. NOISE CRITERIA CURVES ·······························8 5. OUTLINES AND DIMENSIONS ·························9 6.

  • Page 2: Technical Changes

    TECHNICAL CHANGES MU-A18WV - MU-GA50VB - 1. Oil separator has been removed. 2. Model name has been changed. Indication of capacity has been changed. (BTU kW) MU-A24WV - MU-GA60VB - MU-A30WV - MU-GA80VB - 1. Model name has been changed.
  • Page 3 New Specification Current Specification The incompatible refrigerating oil easily separates from Since refrigerant and refrigerating oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigerating 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 0.8 mm 9.52 0.8 mm Specific gravity 0.045 Thickness 8 mm 12.7 For gas 1.0 mm...

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS OUTDOOR UNIT MU-GA50VB - MU-GA60VB - Air inlet (back and side) Piping Drainage hose Air outlet Drain outlet MU-GA80VB - Air inlet (back and side) Air outlet...

  • Page 6: Specification

    SPECIFICATION Outdoor model MU-GA50VB - MU-GA60VB - Cooling Function Cooling Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Dehumidification Air flow(High) 2,196 K /h 2,322 Power outlet Running current 7.90 10.82 Power input 1,750 2,420 Power factor...
  • Page 7 Outdoor model MU-GA80VB - Function Cooling Single phase Power supply 230V, 50Hz Capacity Dehumidification Air flow(High/Low ) K /h 2,940/1,470 Power outlet Running current 14.42 Power input 3,191 Power factor Starting current Compressor motor current 13.85 Fan motor current 0.57 Coefficient of performance(C.O.P) 2.61 Model...

  • Page 8: Noise Criteria Curves

    NOISE CRITERIA CURVES MU-GA50VB - MU-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: NC-70 NC-70 NC-60...

  • Page 9: Outlines And Dimensions

    Service panel Liquid refrigerant pipe joint Refregerant pipe (flared) [6.35 Gas refregerant pipe joint Refregerant pipe (flared) [12.7 (MU-GA50VB) [15.88 (MU-GA60VB) MU-GA80VB - Open as a rule OUTDOOR UNIT 500mm or more if the front and both sides are open...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM MU-GA50VB - MODEL WIRING DIAGRAM OUTDOOR UNIT INDOOR UNIT CONNECTING DSAR CIRCUIT BREAKER POWER SUPPLY 230V 50Hz GRN/YLW SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR COMPRESSOR (INNER PROTECTOR) COMPRESSOR CONTACTOR OUTDOOR FAN CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR)

  • Page 11: Outdoor Unit

    MU-GA80VB - MODEL WIRING DIAGRAM OUTDOOR UNIT RT62 RT63 CIRCUIT BREAKER 1 2 3 CN711 CN662 CN724 SR62 SR61 TAB52 CN730 DEICER NR61 P.C. BOARD SYMBOL SYMBOL NAME SYMBOL NAME NAME CZ SURGE ABSORBER SR62 SOLID STATE RELAY COMPRESSOR (INNER PROTECTOR) COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MU-GA50VB - Unit:mm OUTDOOR UNIT Refrigerant pipe [12.7 (with heat insulator) Muffler Stop valve (with service Outdoor heat port) Flared connection exchanger Strainer #100 Compressor Flared connection Stop valve Capillary tube [3.0o[1.6o600 Refrigerant pipe [6.35 (with heat insulator)
  • Page 13 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Liquid Indoor unit Outdoor unit MU-GA50VB - 12.7 6.35 Gas 0.43 Gas 0 MU-GA60VB - Liquid 0.5 Liquid 0 15.88 MU-GA80VB - 9.52...
  • Page 14 ADDITIONAL REFRIGERANT CHARGE(R410A : g) Refrigerant piping length (one way) Outdoor unit precharged Model MU-GA50VB - 1,450 Calculation : Xg=20g/m (Refrigerant piping length (m)–7) Refrigerant piping length (one way) Model Outdoor unit precharged 2,000 MU-GA60VB - Calculation : Xg=20g/m (Refrigerant piping length (m)–7)

  • Page 15: Performance Curves

    PERFORMANCE CURVES MU-GA50VB - MU-GA60VB - MU-GA80VB - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been pro- vided 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]) MU-GA50VB - MU-GA50VB - 230V 230V 35(:)
  • Page 17 PERFORMANCE DATA COOL operation MS-GA50VB - : MU-GA50VB - (230V) CAPACITY : 5.0(kW) SHF : 0.65 INPUT : 1810(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 1448 5.63 2.64 0.47...
  • Page 18 PERFORMANCE DATA COOL operation MS-GA50VB - : MU-GA50VB - (230V) CAPACITY : 5.0(kW) SHF : 0.65 INPUT : 1810(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.30 0.47 1774 4.50 2.12 0.47 1882 4.33 2.03 0.47...
  • Page 19 PERFORMANCE DATA COOL operation MS-GA60VB - : MU-GA60VB - (230V) CAPACITY : 6.5(kW) SHF : 0.63 INPUT : 2480(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 7.64 3.44 0.45 1984 7.31 3.29 0.45 2083...
  • Page 20 PERFORMANCE DATA COOL operation MS-GA60VB - : MU-GA60VB - (230V) CAPACITY : 6.5(kW) SHF : 0.63 INPUT : 2480(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 6.37 2.87 0.45 2430 5.85 2.63 0.45 2579 5.62 2.53 0.45 2629...
  • Page 21 PERFORMANCE DATA COOL operation MS-GA80VB - : MU-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...
  • Page 22 PERFORMANCE DATA COOL operation MS-GA80VB - : MU-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...

  • Page 23: Troubleshooting

    TROUBLESHOOTING MU-GA50VB - MU-GA60VB - MU-GA80VB - 9-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: (1) Check the power supply voltage. (2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. (1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
  • Page 24 9-2. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. operates. OPERATION INDICATOR doesn't receive Outdoor unit Outdoor unit lamp on the indoor unit is the signal from doesn't doesn't operate flashing on and off. remote controller. operate. normally.
  • Page 25 9-3. Trouble criterion of main parts MU-GA50VB - MU-GA60VB - MU-GA80VB - Part name Check method and criterion Figure Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Discharge temperature (Part temperature 0˚C ~ 40˚C)

  • Page 26: Check Of Outdoor Unit

    9-4. Troubleshoot flow Compressor and/or outdoor fan motor doesn’t operate. Check of outdoor unit MU-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.

  • Page 27: How To Check Mis-Wiring

    Compressor and/or outdoor fan motor doesn’t stop. Check of outdoor unit MU-GA80VB 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.

  • Page 28: Check Of Lev (Expansion Valve)

    When OPERATION INDICATOR lamp flashes 10-time. Cooling doesn't operate. Check of LEV (Expansion valve) MU-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 29 9-5. Test point diagram and voltage MU-GA80VB - Outdoor deicer P.C. board 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(:) CN662 1-2 CN662 3-4 Fan motor...

  • Page 30: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 10-1. MU-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 31 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Hook Photo 4 (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hooked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove screws fixing the outdoor fan motor.
  • Page 32 10-2. MU-GA60VB - OUTDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Screws Service panel Photo 2 Screws 2.
  • Page 33 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Photo 4 Hook (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hocked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove the screws fixing the fan motor.
  • Page 34 10-3. MU-GA80VB - OUTDOOR UNIT 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. (4) Remove the service panel.
  • Page 35 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 36: Parts List

    PARTS LIST MU-GA50VB - MU-GA60VB - 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 37 MU-GA50VB - MU-GA60VB - 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MU-GA50VB - MU-GA60VB - Diagram E02 817 233...
  • Page 38 MU-GA80VB - 11-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 39 MU-GA80VB - 11-2. 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 MU-GA80VB - Diagram E02 819 297 TOP PANEL OUTDOOR HEAT EXCHANGER E02 819 630 E02 819 301...
  • Page 40 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Oct. 2004 Distributed in Oct. 2004. No.OB370 6 Specifications subject to change without notice. Made in Japan...

This manual is also suitable for:

Mu-ga60vbMu-ga80vb

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