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SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MSC-GA20VB -
MSC-GA25VB -
MSC-GA35VB -
Indication of model name
NOTE:
•This manual describes technical data of indoor units.
•As for outdoor units MU-GA20/GA25/GA35VB -
•As for outdoor units MUH-GA20/GA25/GA35VB -
•As for outdoor units MUX-2A28/2A59/3A60/3A63/2A70/4A73VB -
OB384.
•As for outdoor units MXZ-A14/A18/A26/A32WV -
EDITION-A.
(WH)
E1
(WH)
E1
(WH)
E1
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES ·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM ················8
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8. SERVICE FUNCTIONS ······································9
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9. TROUBLESHOOTING······································11
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10. DISASSEMBLY INSTRUCTIONS·····················18
11. PARTS LIST······················································20
12. OPTIONAL PARTS···········································22
, refer to the service manual OB386.
E1
, refer to the service manual OB387.
E1
E1
, refer to the service manual OB319 REVISED
E1
, refer to the service manual
No. OB385
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Table of Contents
Related Manuals for Mitsubishi Electric MSC-GA25VB-E1
Summary of Contents for Mitsubishi Electric MSC-GA25VB-E1
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB385 SERVICE MANUAL Wireless type Models MSC-GA20VB - (WH) MSC-GA25VB - (WH) MSC-GA35VB - (WH) CONTENTS 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························6 5. -
Page 3: Msc-Ga20Vb
TECHNICAL CHANGES MSC-A07YV - MSC-GA20VB - 1. Indication of capacity has been changed. (BTU base 2. P.C. board has been changed. 3. Air cleaning filter has been changed to optional parts. 4. Fan motor has been changed. 5. Fan motor capacitor has been changed. 6. - Page 4 MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - ACCESSORIES <Indoor unit> Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 16 mm Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) REMOTE CONTROLLER Signal transmitting section Operation display section...
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Page 5: Specification
SPECIFICATION Indoor model MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - Cooling Heating Cooling Heating Cooling Heating Function Single phase Single phase Single phase Indoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Air flow(High/Med. /Low ) K /h 474/372 /276 510/420 /342 474/384 /306 588/456 /342 582/444 /324... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSC-GA20VB- MSC-GA25VB- SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION COOLING COOLING High High HEATING HEATING Test conditions, Test conditions. Cooling : DB27: WB19: Cooling : DB27: WB19: Heating : DB20: WB -: Heating : DB20: WB -: NC-70 NC-70... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSC-GA20VB - Unit: mm 81.5 133.5 MSC-GA25VB - Installation plate INDOOR UNIT Indoor unit 81.5 81.5 Wall hole Air in Installation plate Liquid line 6.35-0.5m Gas line 9.52-0.43m Insulation 37 O.D 21 I.D Drain hose (Connected part O,D) Insulation Air out Power supply cord... -
Page 8: Wiring Diagram
WIRING DIAGRAM MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - MODELS WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT LD105 RT12 CONNECTING CN201 RT11 FOR MUH OR MXZ-A TYPE NR11 CN202 MU OR MUX TYPE SR141 CN211 LD103 POWER ELECTRONIC CONTROL P.C. BOARD SUPPLY CORD ~/N 230V... -
Page 9: Service Functions
SERVICE FUNCTIONS MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to 9-6.) Set time : 1 minute 1-second Set time : 3 minutes... - Page 10 8-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION 1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER SW2-1 sets the AUTO RESTART FUNCTION ON / OFF. SW2-2 switches over the MU & MUX type / MUH & MXZ type. The indoor units for MU &...
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Page 11: Troubleshooting
TROUBLESHOOTING MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - 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 con- firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 12 9-2. Instruction of troubleshooting MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - Start Indoor unit OPERATION Indoor unit Indoor unit Indoor unit operates. INDICATOR operates. operates. doesn't receive Outdoor unit lamp on the But indoor Outdoor unit the signal from doesn't operate indoor unit is unit doesn't doesn't...
- Page 13 9-3. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
- Page 14 9-4. Trouble criterion of main parts MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature (Part temperature 10°C ~ 30°C) thermistor (RT11) Normal Abnormal MSC-GA20/GA25/GA35VB Indoor coil Open or thermistor (RT12) short-circuit 8kΩ...
- Page 15 Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B B Check of remote controller and receiver P.C. board wCheck the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote con- Replace the batteries.
- Page 16 When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. <MUH-GA20/GA25/GA35VB, MXZ-A14/A18/A26/A32WV> D D How to check mis-wiring and serial signal error 1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work.
- Page 17 9-6. Test point diagram and voltage MSC-GA20VB - MSC-GA25VB - MSC-GA35VB - Indoor electronic control P.C. board Power supply input 230V AC Fuse F11 250V AC 3.15A R132 Indoor fan motor 230V AC Safety device of fan by horizontal vane CN1R1 Room temperature Varistor thermistor RT11...
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Page 18: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 19 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Vane motor Indoor coil thermistor Photo 3 connector (1) Remove the front panel. (Refer to 1.) connector (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A. clamp. (Refer to 2.) Screw of the electrical box (4) Remove the cord clamp.
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Page 20: Parts List
PARTS LIST MSC-GA20VB - (WH) MSC-GA25VB - (WH) MSC-GA35VB - (WH) 11-2. ACCESSORY AND 11-1. INDOOR UNIT STRUCTURAL PARTS REMOTE CONTROLLER 1 (W) 8 (W) Optional parts (See page 22.) (W) These figures show about MSC-GA35VB. 6 (W) 11-1. INDOOR UNIT STRUCTURAL PARTS Symbol Q'ty/unit in Wiring... - Page 21 MSC-GA20VB - (WH) MSC-GA25VB - (WH) MSC-GA35VB - (WH) 11-4. INDOOR UNIT HEAT EXCHANGER 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 20 (W) SLEEVE BEARING ROOM TEMPERATURE THERMISTOR FUSE VARISTOR (W) This figure shows MSC-GA35VB. 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration.
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Page 22: Optional Parts
OPTIONAL PARTS AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. - Page 24 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Jan. 2005 Specifications subject to change without notice. Distributed in Jan. 2005. No.OB385 6 Made in Japan...