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SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
MSH-GA50VB -
MSH-GA60VB -
MSH-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).
• Parts numbers of indoor fan motor and
motor band have been changed.
• Some descriptions have been modified.
Please void OB367 REVISED EDITION-C.
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
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 ················9
8. SERVICE FUNCTIONS ····································10
9. TROUBLESHOOTING······································12
10. DISASSEMBLY INSTRUCTIONS·····················21
11. PARTS LIST······················································23
12. RoHS PARTS LIST···········································25
13. OPTIONAL PARTS···········································27
No. OB367
REVISED EDITION-D
Outdoor unit service manual
MUH-GA•VB Series (OB368)
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSH-GA50VB- E1
Summarization of Contents
Part Names and Functions Overview
Included Accessories
Lists included accessories with the indoor unit.
Service Functions and Modes
Timer Short Mode for Service
Shortens timer settings for service purposes.
PC Board Modification for Multi-Unit Operation
Modifies PC boards for individual unit control with multiple units.
Troubleshooting Guide
9-1. Troubleshooting Cautions
Important safety and procedural precautions before troubleshooting.
Remote Controller Battery Replacement
Steps for replacing batteries in the remote controller.
9-2. Troubleshooting Instruction
Detailed diagnostic steps and procedures for troubleshooting.
9-3. Troubleshooting Indicator Table
Table correlating operation indicator patterns with symptoms and remedies.
9-4. Main Parts Trouble Criterion
Criteria and methods for testing major internal components.
9-5. Troubleshooting Flowcharts
Flowcharts guiding diagnosis of unit malfunctions, covering fan motor, remote control, PC board, and mis-wiring.
9-6. Test Point Diagrams and Voltages
Diagrams and voltage references for diagnostic testing of electronic boards.
Disassembly Instructions
Model-Specific Disassembly Procedures
Disassembly procedures specific to the MSH-GA series indoor units.
Parts List (Non-RoHS)
11-1. Indoor Unit Structural Parts List
List of structural components for the indoor unit.
11-2. Indoor Unit Heat Exchanger Parts List
List of parts related to the indoor unit's heat exchanger.
RoHS Compliant Parts List
12-1. RoHS Indoor Unit Structural Parts
List of structural components compliant with RoHS standards.
12-2. RoHS Indoor Unit Heat Exchanger Parts
List of heat exchanger parts compliant with RoHS standards.
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