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Mitsubishi Electric MSZ-G20SV User Manual

Mitsubishi Electric MSZ-G20SV
116 pages
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································7
4. NOISE CRITERIA CURVES ·····························11
5. OUTLINES AND DIMENSIONS ·······················13
6. WIRING DIAGRAM ··········································17
7. REFRIGERANT SYSTEM DIAGRAM··············21
8. PERFORMANCE CURVES······························24
9. MICROPROCESSOR CONTROL ····················35
10. SERVICE FUNCTIONS·····································63
11. TROUBLESHOOTING······································66
12. DISASSEMBLY INSTRUCTIONS·····················97
13. PARTS LIST····················································106
14. OPTIONAL PARTS·········································115
Wireless type
Models
MSZ-G09SV -
(
WH
)
· MUZ-G09SV -
MSZ-G09SV -
(
WH
)
· MUZ-G09SV -
MSZ-G12SV -
(
WH
)
· MUZ-G12SV -
MSZ-G12SV -
(
WH
)
· MUZ-G12SV -
MSZ-G20SV -
(
WH
)
· MUZ-G20SV -
E1E1
E2E2
E1E1
E2E2
E1E1
No. OB245
REVISED EDITION-B
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Revision:
MSZ-G20SV - has been added.
SPECIFICATION, PERFORMANCE CURVES
and PARTS LIST have been added.
Please void OB245 REVISED EDITION-A.
E1
MSZ-G20SV -
E1
OB245 --1qxp 02.10.22 4:08 PM Page 1

Table of Contents

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Mitsubishi Electric MSZ-G20SV Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMSZ-G20SV
CategoryAir Conditioner
LanguageEnglish

Summary

TECHNICAL CHANGES

PART NAMES AND FUNCTIONS

SPECIFICATION

NOISE CRITERIA CURVES

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

PERFORMANCE CURVES

PERFORMANCE DATA COOL operation

PERFORMANCE DATA HEAT operation

MICROPROCESSOR CONTROL

COOL mode of “I FEEL CONTROL”

Details the COOL operation mode using "I FEEL CONTROL" for automatic fan speed adjustment.

DRY ( ) OPERATION

Explains the DRY operation mode, focusing on humidity control and fan operation.

HEAT ( ) OPERATION

Describes the HEAT operation mode, including fan speed control and warm air circulation.

TIMER OPERATION

Provides instructions on setting and cancelling ON/OFF timers for unit operation.

“I FEEL CONTROL” (h) OPERATION

Details the "I FEEL CONTROL" operation mode, including room temperature determination and fuzzy control.

EMERGENCY-TEST OPERATION

Explains how to perform emergency or test run operations using the indoor unit switch.

Main power supply circuit

Details the main power supply circuit and its components for the outdoor unit.

Optimal voltage control

Describes the optimal voltage control strategy to improve compressor efficiency.

LEV control

Details the linear expansion valve (LEV) control logic and settings.

SERVICE FUNCTIONS

Defrost Setting and Timer Short Mode

Explains how to modify defrost settings and shorten timer times for service.

P.C. Board Modification and Auto Restart

Details P.C. board modifications for multi-unit operation and the auto restart function.

TROUBLESHOOTING

Cautions on Troubleshooting

Lists important precautions to follow before and during troubleshooting procedures.

Instruction of Troubleshooting

Outlines the general troubleshooting flow and diagnostic indicators like flashing lamps.

Troubleshooting Check Table

Correlates operation indicator lamp patterns with symptoms, detection methods, and checkpoints.

Trouble Criterion of Main Parts

Provides resistance and voltage criteria for testing key internal components for defects.

DISASSEMBLY INSTRUCTIONS

Indoor Unit Disassembly

Provides instructions for removing the front panel and electronic control boards of the indoor unit.

Outdoor Unit Disassembly

Details procedures for removing the cabinet, inverter assembly, and other components of the outdoor unit.

PARTS LIST

INDOOR UNIT STRUCTURAL PARTS

Lists structural parts for the indoor unit with part numbers and quantities.

INDOOR UNIT HEAT EXCHANGER

Lists indoor unit heat exchanger parts, including unions and their sizes.

INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

Lists functional and electrical parts for the indoor unit with part numbers and quantities.

ACCESSORY AND REMOTE CONTROLLER

Lists accessories and remote controller parts with their corresponding part numbers.

OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

Lists structural and functional parts for the outdoor unit with part numbers and quantities.

OUTDOOR UNIT ELECTRICAL PARTS

Lists electrical parts for the outdoor unit with their specifications and part numbers.

AIR CLEANING FILTER

Details the air cleaning filter's function, life, and maintenance.

DEODORIZING FILTER

Details the deodorizing filter, including cleaning instructions and replacement.

OPTIONAL PARTS

AIR CLEANING FILTER

Information on the air cleaning filter's function, life, and maintenance.

DEODORIZING FILTER

Information on the deodorizing filter's function, cleaning, and replacement.

Drain socket

Details the drain socket, its installation, and connection requirements.

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