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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-GA80VB- E1
Summarization of Contents
PART NAMES AND FUNCTIONS
ACCESSORIES
Lists included accessories for indoor units.
SERVICE FUNCTIONS
TIMER SHORT MODE
Shortens set time for service purposes by short-circuiting specific points.
P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
Modifies P.C. boards for individual indoor unit operation with multiple remotes.
AUTO RESTART FUNCTION
Manages automatic unit restart after power interruption.
TROUBLESHOOTING
Cautions on troubleshooting
Safety and procedural precautions before performing troubleshooting.
How to replace batteries
Steps for replacing batteries in the remote controller.
Instruction of troubleshooting
General flowchart and steps for diagnosing unit issues based on indicators.
Troubleshooting check table
Table correlating operation indicator flashes with symptoms and remedies.
Trouble criterion of main parts
Methods and criteria for checking key internal components for faults.
Troubleshooting flow
Detailed troubleshooting flows for specific issues like fan motor or remote communication.
Check of indoor electronic control P.C. board
Procedure to check the indoor electronic control P.C. board for faults.
How to check mis-wiring
Step-by-step guide to identify and correct mis-wiring issues.
Test point diagram and voltage
Diagrams showing test points, voltage, and resistance values on electronic boards.
DISASSEMBLY INSTRUCTIONS
Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board
Procedure to remove main electronic boards from the indoor unit.
Removing the electrical box
Steps to remove the electrical junction box.
Removing the vane motor
Procedure for disassembling and removing the vane motor.
Removing the line flow fan and the indoor fan motor
Steps to detach the fan motor and fan assembly.
PARTS LIST (non-RoHS compliant)
INDOOR UNIT STRUCTURAL PARTS
List and diagrams of the indoor unit's external and structural components.
INDOOR UNIT HEAT EXCHANGER
Parts list for the indoor unit's heat exchanger and associated piping.
INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
List of internal functional components and electrical parts.
ACCESSORY AND REMOTE CONTROLLER
List of accessories and the remote controller.
RoHS PARTS LIST (RoHS compliant)
INDOOR UNIT STRUCTURAL PARTS
RoHS compliant list of indoor unit structural components.
INDOOR UNIT HEAT EXCHANGER
RoHS compliant parts list for the indoor unit heat exchanger.
INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
RoHS compliant list of functional and electrical parts.
ACCESSORY AND REMOTE CONTROLLER
RoHS compliant list of accessories and remote controller.
OPTIONAL PARTS
AIR CLEANING FILTER
Information and part number for the optional air cleaning filter.
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