Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUH-GA50VB -
MUH-GA50VB -
MUH-GA60VB -
MUH-GA80VB -
NOTE:
This service manual describes technical data of outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
E1
E2
E1
E1
CONTENTS
10. TROUBLESHOOTING······································25
MUH-GA50VB
11. DISASSEMBLY INSTRUCTIONS·····················36
12. PARTS LIST······················································40
13. RoHS PARTS LIST···········································46
Revision:C
• The fan guard for MUH-GA60VB-
MUH-GA80VB-
Please void OB368 REVISED EDITION-B.
HFC
utilized
R410A
Indoor unit service manual
MSH-GA•VB Series (OB367)
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. SERVICE FUNCTIONS ····································25
E1
has been changed.
E1
No. OB368
REVISED EDITION-C
and
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi MUH-GA60VB
Summarization of Contents
Technical Changes and R410A Information
Model and Capacity Updates
Details changes in model names and capacity indications for specific MUH-GA series units.
Component Updates
Covers modifications to outdoor heat exchangers, fan motors, and oil separators for specific models.
R410A Refrigerant System Information
Provides essential information and precautions for using R410A refrigerant, highlighting pressure and contamination sensitivity.
R410A Tools and Piping Specifications
Details necessary tools for R410A refrigerant systems and piping specifications.
R410A Refrigerant Oil, Purging, and Charging
Covers refrigerant oil, air purging procedures, and guidelines for additional refrigerant charging.
Part Names and Functions
MUH-GA50VB Part Identification
Illustrates and labels the external parts of the MUH-GA50VB outdoor unit.
MUH-GA60VB/GA80VB Part Identification
Shows and labels the external components of the MUH-GA60VB and MUH-GA80VB outdoor units.
Included Accessories
Lists the accessories provided with the MUH-GA50VB and MUH-GA60VB models, such as drain sockets and caps.
Specifications Overview
MUH-GA50VB Specifications
Details electrical, fan, compressor, and special remark specifications for the MUH-GA50VB model.
MUH-GA60VB Specifications
Provides electrical, fan, compressor, and special remark specifications for the MUH-GA60VB model.
MUH-GA80VB Specifications
Details electrical, fan, compressor, and special remark specifications for the MUH-GA80VB model.
Noise Criteria Curves
MUH-GA50VB Noise Curves
Presents noise criteria curves for the MUH-GA50VB unit at different fan speeds and frequencies.
MUH-GA60VB Noise Curves
Displays noise criteria curves for the MUH-GA60VB unit across various fan speeds and frequency bands.
MUH-GA80VB Noise Curves
Shows noise criteria curves for the MUH-GA80VB unit, detailing sound pressure levels by frequency.
Outlines and Dimensions
MUH-GA50VB Dimensions and Required Space
Provides detailed outline drawings, dimensions, and required installation space for the MUH-GA50VB unit.
MUH-GA60VB/GA80VB Dimensions and Required Space
Shows outline drawings, dimensions, and necessary installation clearances for MUH-GA60VB and MUH-GA80VB units.
Wiring Diagrams
MUH-GA50VB Wiring Diagram
Illustrates the electrical wiring for the MUH-GA50VB outdoor unit, including component symbols and connections.
MUH-GA60VB Wiring Diagram
Presents the wiring diagram for the MUH-GA60VB outdoor unit, detailing electrical connections and component references.
MUH-GA80VB Wiring Diagram
Shows the electrical wiring schematic for the MUH-GA80VB outdoor unit, including component labels and connections.
Refrigerant System Diagrams
MUH-GA50VB-E1 Refrigerant Flow
Depicts the refrigerant circuit for MUH-GA50VB-E1, showing components and flow paths for cooling and heating.
MUH-GA50VB-E2 Refrigerant Flow
Illustrates the refrigerant system for MUH-GA50VB-E2, highlighting components and operational flow for cooling and heating.
MUH-GA60VB Refrigerant Flow
Shows the refrigerant circuit for MUH-GA60VB, detailing components and flow direction for cooling and heating.
MUH-GA80VB Refrigerant Flow
Depicts the refrigerant system for MUH-GA80VB, including components and flow paths for cooling and heating operations.
Refrigerant Piping and Charging Guidelines
Maximum Refrigerant Piping Lengths
Specifies the maximum allowable lengths for gas and liquid refrigerant pipes for each model.
Maximum Height Difference
Outlines the maximum permissible vertical distance between indoor and outdoor units for refrigerant piping.
Additional Refrigerant Charge Calculation
Provides formulas and values for calculating the additional refrigerant charge based on piping length.
Performance Curves
Performance Curve Overview and Measurement
Explains how to interpret performance curves and measure indoor air temperatures for analysis.
Cooling Performance Curves
Presents curves showing cooling capacity and input correction factors based on indoor and outdoor temperatures.
Heating Performance Curves
Displays curves for heating capacity and total input, indicating conditions without frost.
Outdoor Unit Cooling Performance Data
Shows graphs for outdoor low pressure and unit current during cooling operation versus ambient conditions.
Outdoor Unit Heating Performance Data
Presents graphs for outdoor unit current during heating operation based on ambient temperature.
Detailed Performance Data (Cooling)
MUH-GA50VB Cooling Performance Table
Presents detailed cooling performance data (capacity, input) for MUH-GA50VB across various indoor/outdoor conditions.
MUH-GA60VB Cooling Performance Table
Provides detailed cooling performance data (capacity, input) for MUH-GA60VB across various indoor/outdoor conditions.
MUH-GA50VB Cooling Performance Table (cont.)
Continues detailed cooling performance data for MUH-GA50VB, covering additional temperature ranges.
MUH-GA60VB Cooling Performance Table (cont.)
Continues detailed cooling performance data for MUH-GA60VB, covering additional temperature ranges.
MUH-GA60VB Cooling Performance Table (cont. 2)
Further detailed cooling performance data for MUH-GA60VB, including more temperature points.
MUH-GA60VB Cooling Performance Table (cont. 3)
Final detailed cooling performance data for MUH-GA60VB across various conditions.
MUH-GA80VB Cooling Performance Table
Presents detailed cooling performance data for MUH-GA80VB across various indoor/outdoor conditions.
MUH-GA80VB Cooling Performance Table (cont.)
Continues detailed cooling performance data for MUH-GA80VB, covering additional temperature ranges.
Detailed Performance Data (Heating)
MUH-GA50VB Heat Performance Table
Details heat performance data (capacity, input) for MUH-GA50VB based on indoor and outdoor temperatures.
MUH-GA60VB Heat Performance Table
Provides heat performance data (capacity, input) for MUH-GA60VB across various indoor and outdoor temperature conditions.
MUH-GA80VB Heat Performance Table
Lists heat performance data (capacity, input) for MUH-GA80VB according to indoor and outdoor temperature conditions.
Service Functions
Compulsory Defrost Mode
Describes how to activate the compulsory defrost mode for service purposes, referencing deicer P.C. board short circuits.
Defrost Setting Adjustments
Explains how to change defrost interval time and temperature settings using jumper wires.
Troubleshooting
Troubleshooting Precautions
Lists safety cautions and checks to perform before and during troubleshooting procedures.
Troubleshooting Procedure Overview
Outlines the initial steps for troubleshooting, including checking indicator lamps and connections.
Troubleshooting Flowchart: Unit Operation Issues
A flowchart guiding diagnosis for issues like outdoor unit not operating or stopping.
Trouble Criteria for Main Components
Details resistance checks and criteria for major parts like thermistors, compressor, and fan motor.
Troubleshooting Flow: MUH-GA50VB Compressor/Fan Issues
A diagnostic flow for MUH-GA50VB when the compressor or outdoor fan motor does not operate.
Troubleshooting Flow: MUH-GA60VB/GA80VB Compressor/Fan Issues
Diagnostic steps for MUH-GA60VB/GA80VB when compressor or outdoor fan motor fails to operate.
Troubleshooting Flow: Unit Not Stopping
Diagnostic steps for units that do not stop operation, covering compressor and fan motor checks.
Troubleshooting Flow: Incorrect Mode Operation
Diagnostic flow for units operating in the wrong mode (e.g., HEAT when COOL is set), focusing on R.V. coil.
Troubleshooting Flow: R.V. Coil and Mode Operation
Diagnostic steps for R.V. coil related to mode switching and checks for mis-wiring issues.
Troubleshooting Flow: Mis-wiring Detection
Steps to check for and diagnose mis-wiring issues indicated by the operation lamp.
Troubleshooting: LEV (Expansion Valve) Issues
Guides on checking the LEV (Expansion Valve) when the operation indicator flashes 10 times, indicating heating/cooling failure.
Troubleshooting: Outdoor Thermistor Abnormalities
Procedure to check outdoor thermistors (defrost, discharge, ambient) for abnormalities indicated by a 6-time flash.
Test Point Diagram and Voltage: MUH-GA50VB
Diagram showing test points and voltage measurements on the MUH-GA50VB outdoor deicer P.C. board.
Test Point Diagram and Voltage: MUH-GA60VB/GA80VB
Illustrates test points and voltage readings on the deicer P.C. board for MUH-GA60VB and MUH-GA80VB.
Disassembly Instructions
Terminal Connector Detaching Points
Explains how to detach terminals with and without locking mechanisms for safe disassembly.
MUH-GA50VB Cabinet and Board Removal
Step-by-step procedures for removing the cabinet and deicer P.C. board of the MUH-GA50VB outdoor unit.
MUH-GA50VB Fan Motor and Compressor Removal
Details the process for removing the propeller, fan motor, and compressor from the MUH-GA50VB unit.
Disassembly Instructions (MUH-GA60VB/GA80VB)
MUH-GA60VB/GA80VB Cabinet and Board Removal
Instructions for removing cabinets, panels, and the deicer P.C. board from MUH-GA60VB and MUH-GA80VB units.
MUH-GA60VB/GA80VB Fan Motor and Compressor Removal
Details the process of removing the propeller, fan motor, and compressor for MUH-GA60VB/GA80VB units.
Parts List (non-RoHS compliant)
MUH-GA50VB Structural and Electrical Parts
Lists structural, electrical, and functional parts for the MUH-GA50VB outdoor unit with corresponding part numbers.
MUH-GA50VB Accessories
Lists accessory parts for the MUH-GA50VB model, including drain socket and caps.
MUH-GA50VB Parts List Details
Detailed list of part numbers, symbols, and quantities for MUH-GA50VB outdoor unit components.
MUH-GA50VB Accessory Parts List
Detailed list of accessory parts for the MUH-GA50VB model, including part numbers and quantities.
MUH-GA60VB Structural and Electrical Parts Diagram
Exploded view illustrating structural, electrical, and functional parts for the MUH-GA60VB outdoor unit.
MUH-GA60VB Accessories Diagram
Diagram showing accessory parts for the MUH-GA60VB model.
MUH-GA60VB Parts List Details
Detailed list of part numbers, symbols, and quantities for MUH-GA60VB outdoor unit components.
MUH-GA60VB Accessory Parts List
Detailed list of accessory parts for the MUH-GA60VB model, including part numbers and quantities.
MUH-GA80VB Structural and Electrical Parts Diagram
Exploded view illustrating structural, electrical, and functional parts for the MUH-GA80VB outdoor unit.
MUH-GA80VB Accessories Diagram
Diagram showing accessory parts for the MUH-GA80VB model.
MUH-GA80VB Parts List Details
Detailed list of part numbers, symbols, and quantities for MUH-GA80VB outdoor unit components.
MUH-GA80VB Accessory Parts List
Detailed list of accessory parts for the MUH-GA80VB model, including part numbers and quantities.
RoHS Parts List (RoHS compliant)
MUH-GA50VB RoHS Structural and Electrical Parts Diagram
Exploded view illustrating RoHS-compliant structural, electrical, and functional parts for MUH-GA50VB.
MUH-GA50VB RoHS Accessories Diagram
Diagram showing RoHS-compliant accessory parts for the MUH-GA50VB model.
MUH-GA50VB RoHS Parts List Details
Detailed list of RoHS-compliant part numbers, symbols, and quantities for MUH-GA50VB components.
MUH-GA50VB RoHS Accessory Parts List
Detailed list of RoHS-compliant accessory parts for MUH-GA50VB, including part numbers and quantities.
MUH-GA60VB RoHS Structural and Electrical Parts Diagram
Exploded view illustrating RoHS-compliant structural, electrical, and functional parts for MUH-GA60VB.
MUH-GA60VB RoHS Accessories Diagram
Diagram showing RoHS-compliant accessory parts for the MUH-GA60VB model.
MUH-GA60VB RoHS Parts List Details
Detailed list of RoHS-compliant part numbers, symbols, and quantities for MUH-GA60VB components.
MUH-GA60VB RoHS Accessory Parts List
Detailed list of RoHS-compliant accessory parts for MUH-GA60VB, including part numbers and quantities.
MUH-GA80VB RoHS Structural and Electrical Parts Diagram
Exploded view illustrating RoHS-compliant structural, electrical, and functional parts for MUH-GA80VB.
MUH-GA80VB RoHS Accessories Diagram
Diagram showing RoHS-compliant accessory parts for the MUH-GA80VB model.
MUH-GA80VB RoHS Parts List Details
Detailed list of RoHS-compliant part numbers, symbols, and quantities for MUH-GA80VB components.
MUH-GA80VB RoHS Accessory Parts List
Detailed list of RoHS-compliant accessory parts for MUH-GA80VB, including part numbers and quantities.
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