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Mitsubishi Electric MUH-A12WV User Manual

Mitsubishi Electric MUH-A12WV
158 pages
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························8
4. INDOOR UNITS COMBINATION ·······················9
5. SPECIFICATION···············································10
6. NOISE CRITERIA CURVES···························· 17
7. OUTLINES AND DIMENSIONS ······················ 20
8. WIRING DIAGRAM ··········································25
9. REFRIGERANT SYSTEM DIAGRAM··············32
10. PERFORMANCE CURVES······························45
11. MICROPROCESSOR CONTROL·····················84
12. SERVICE FUNCTIONS···································102
13. TROUBLESHOOTING····································104
14. DISASSEMBLY INSTRUCTIONS···················129
15. PARTS LIST····················································144
16. OPTIONAL PARTS·········································157
Wireless type
Models
MSC-A07WV -
(
WH
)
· MU-A07WV -
MSC-A09WV -
(
WH
)
· MU-A09WV -
MSC-A12WV -
(
WH
)
· MU-A12WV -
MSC-A07WV -
(
WH
)
· MUH-A07WV -
MSC-A09WV -
(
WH
)
· MUH-A09WV -
MSC-A12WV -
(
WH
)
· MUH-A12WV -
Multi system type
Models
MSC-A07WV -
(
WH
)
· MUX-A10WV -
MSC-A09WV -
(
WH
)
· MUX-A19WV -
MSC-A12WV -
(
WH
)
· MUX-A20WV -
· MUX-A25WV -
· MUX-A26WV -
Inverter-controlled multi system Model
· MXZ-A18WV -
E1
E1
E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
MSC-A07WV -
MSC-A09WV -
MSC-A12WV -
E1
E1
E1
No. OB307
REVISED EDITION-A
HFC
utilized
R410A
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Revision:
MXZ-A18WV - have been added.
MSC-A07/09/12WV - Part No.
.
have changed.
VARISTOR (NR11& NR12)
E02 336 385 E02 749 385
Please void OB307.
E1
E1
Indication of
model name
Remote
controller
OB307A1.qxp 03.2.19 3:56 PM Page 1
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Mitsubishi Electric MUH-A12WV Specifications

General IconGeneral
Cooling Capacity3.5 kW
Cooling Capacity (BTU)12000 BTU
Voltage220-240V
Indoor Unit Weight9.5 kg
Power Supply220-240V

Summary

Technical Changes

Part Names and Functions

Indoor Unit Components

Identifies and illustrates components of the indoor unit.

Outdoor Unit Components

Identifies and illustrates components of the outdoor unit.

Included Accessories

Lists items provided with the air conditioner system.

Wireless Remote Controller

Details the functions and layout of the remote controller.

Indoor and Outdoor Unit Compatibility Table

Indoor Unit Combinations for Multi-System

Technical Specifications

Noise Criteria Curves

Dimensions and Outlines

Wiring Diagrams

Refrigerant System Diagrams

Performance Curves

Capacity and Input Curves

Illustrates system capacity and power input based on conditions.

Outdoor Low Pressure and Unit Current Curves

Shows pressure and current relative to ambient conditions.

Inverter Output Frequency Correction Curves

Illustrates performance correction based on inverter frequency.

Microprocessor Control Features

COOL Operation Control

Details control logic for cooling mode operation.

DRY Operation Control

Details control logic for dry mode operation.

HEAT Operation Control

Details control logic for heat mode operation.

Fan Motor Control

Explains fan speed and rotational frequency control mechanisms.

Emergency-Test Operation

Describes service and emergency operation modes.

Service Functions

Compulsory Defrosting Mode

Manual activation of defrost mode for service purposes.

Defrost Setting Changes

Adjusting defrost interval and temperature settings.

PC Board Modification for Individual Operation

Modifying circuit boards for independent indoor unit control.

Troubleshooting Guide

Troubleshooting Cautions

Important safety and preparation steps before troubleshooting.

Troubleshooting Procedure Overview

General steps to follow when diagnosing unit issues.

Troubleshooting Check Table

Symptom-based diagnosis guide with check points.

Trouble Criteria for Main Parts

Resistance and voltage criteria for key components.

Check Indoor Fan Motor

Steps to diagnose indoor fan motor faults.

Check Outdoor Unit

Steps to diagnose outdoor unit operational faults.

Check Mis-wiring and Serial Signal Error

Diagnosing communication and wiring faults.

Check Power Supply

Verifying power input and voltage to the unit.

Check LEV

Diagnosing issues with the expansion valve.

Disassembly Instructions

Indoor Unit Disassembly

Steps for disassembling indoor unit components.

Outdoor Unit Disassembly (MUH Models)

Steps for disassembling MUH series outdoor units.

Outdoor Unit Disassembly (MUX Models)

Steps for disassembling MUX series outdoor units.

Outdoor Unit Disassembly (MXZ-A18WV)

Steps for disassembling the MXZ-A18WV outdoor unit.

Parts List

Indoor Unit Parts

List of structural, electrical, and functional indoor unit components.

Outdoor Unit Parts

List of structural, electrical, and functional outdoor unit components.

Accessories

List of included accessories such as remote controllers.

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