Mitsubishi Electric MS-GA50VB Service Manual
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Mitsubishi Electric MS-GA50VB Service Manual

Split-type air conditioners; wireless type models
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SPLIT-TYPE, AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MS-GA50VB -
MS-GA60VB -
MS-GA80VB -
NOTE:
This service manual describes technical data of the indoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS PARTS LIST (RoHS compliant).
Revision B :
• Indoor heat exchanger of MS-GA80VB -
• PARTS LIST and RoHS PARTS LIST have been changed.
Please void OB369 REVISED EDITION-A.
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················19
11. PARTS LIST······················································21
12. RoHS PARTS LIST···········································23
13. OPTIONAL PARTS···········································25
has been changed.
E1
No. OB369
REVISED EDITION-B
Outdoor unit service manual
MU-GA•VB Series (OB370)

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  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR CONDITIONERS Please void OB369 REVISED EDITION-A. INDOOR UNIT No. OB369 SERVICE MANUAL REVISED EDITION-B Wireless type Models MS-GA50VB - MS-GA60VB - MS-GA80VB - Outdoor unit service manual MU-GA•VB Series (OB370) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3.

  • Page 2: Technical Changes

    • Indoor heat exchanger of MS-GA80VB - has been changed. • PARTS LIST and RoHS PARTS LIST have been changed. TECHNICAL CHANGES MS-A18WV - MS-GA50VB - MS-A24WV - MS-GA60VB - MS-A30WV - MS-GA80VB - 1. Model name has been changed.
  • Page 3 REMOTE CONTROLLER MS-GA50VB MS-GA60VB MS-GA80VB Signal transmitting section Operation display section OPERATE/ STOP (ON/ OFF) button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back. Open the front lid. CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button...

  • Page 4: Specification

    SPECIFICATION Indoor model MS-GA50VB MS-GA60VB Cooling Cooling Function Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity Air flow(High/Med./Low) K /h 768/642/528 768/672/588 Power outlet Running current 0.30 0.30 Power input Power factor Fan motor current 0.30 0.30...

  • Page 5: Noise Criteria Curves

    NOISE CRITERIA CURVES MS-GA50VB MS-GA60VB FAN SPEED SPL(dB(A)) LINE FAN SPEED SPL(dB(A)) LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: NC-70 NC-70 NC-60 NC-60 NC-50...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MS-GA50VB Unit: mm MS-GA60VB MS-GA80VB Installation plate Indoor unit 1068 414.5 414.5 Wall hole [75 Liquid line [ 6.35- 0.5m 1100 Air in Installation plate Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D for MS-GA50/60VB Liquid line [ 9.52- 0.5m...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MS-GA50VB MS-GA60VB TO OUTDOOR UNIT CN202 CONNECTING HIC1 RT12 CN112 CN201 NR11 SR141 TAB12 POWER SUPPLY CN211 CORD ELECTRONIC CONTROL ~/N 230V RT11 P. C. BOARD 50Hz CIRCUIT DISPLAY RECEIVER BREAKER P. C. BOARD P. C. BOARD REMOTE...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MS-GA50VB MS-GA60VB Unit:mm Refrigerant pipe [15.88 Refrigerant pipe [12.7 (with heat insulator) (with heat insulator) Indoor coil Indoor coil thermistor Indoor Indoor thermistor RT12 heat RT12 heat exchanger exchanger Distributor Distributor Flared connection Flared connection Room temperature...

  • Page 9: Service Functions

    SERVICE FUNCTIONS MS-GA50VB MS-GA60VB MS-GA80VB 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. Set time : 1 minute...
  • Page 10 8-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure.

  • Page 11: Troubleshooting

    TROUBLESHOOTING MS-GA50VB MS-GA60VB MS-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 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 12 9-2. 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 13 9-3. Troubleshooting check table • The following indication applies regardless of shape of the indicator. Operation Indicator Lighted Not lighted · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighted during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
  • Page 14 9-4. Trouble criterion of main parts MS-GA50VB MS-GA60VB MS-GA80VB Figure Part name Check method and criterion Room temperature Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C) thermistor(RT11) Indoor coil thermistor Refer to 9-6."Test point diagram and voltage", (RT12(main), RT13(sub)) "Indoor electronic control P.C.
  • Page 15 9-5. Troubleshooting flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Is soldered point of the connector Are lead wires connected? Resolder it. correctly soldered? Reconnect the lead wires.
  • Page 16 The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by press- ing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side” of indoor electronic control P.C. board visually.
  • Page 17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring MS-GA80VB w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. Start •...
  • Page 18 9-6. Test point diagram and voltage MS-GA50VB MS-GA60VB MS-GA80VB Indoor electronic control P.C. board Fan motor power supply Power supply input 230V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature ther- mistor(RT11) R132 Indoor coil thermistor(RT12(main)) MS-GA80VB Indoor coil...

  • Page 19: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MS-GA50VB MS-GA60VB MS-GA80VB INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel.
  • Page 20 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the earth wire (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.

  • Page 21: Parts List

    PARTS LIST (non-RoHS compliant) MS-GA50VB MS-GA60VB MS-GA80VB 11-1. INDOOR UNIT STRUCTURAL PARTS 11-2. INDOOR UNIT HEAT EXCHANGER Optional parts (See 13.) 11-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No.
  • Page 22 PARTS LIST (non-RoHS compliant) MS-GA50VB MS-GA60VB MS-GA80VB 11-4. ACCESSORY AND 11-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS 15 16 11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration.

  • Page 23: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MS-GA50VB MS-GA60VB MS-GA80VB 12-1. INDOOR UNIT STRUCTURAL PARTS 12-2. INDOOR UNIT HEAT EXCHANGER Optional parts (See 13.) 12-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No.
  • Page 24 RoHS PARTS LIST (RoHS compliant) MS-GA50VB MS-GA60VB MS-GA80VB 12-4. ACCESSORY AND 12-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS 15 16 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration.

  • Page 25: Optional Parts

    Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MS-GA50VB MS-GA60VB MAC-1700FT MS-GA80VB Air cleaning filter (White bellows type)
  • Page 28 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 May 2007. No.OB369 REVISED EDITION-B 6 Distributed in May 2006. No.OB369 REVISED EDITION-A 6 New publication, effective May 2007 Distributed in Oct. 2004. No.OB369 6 Specifications subject to change without notice.

This manual is also suitable for:

Ms-ga60vbMs-ga80vb

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