Mitsubishi Electric MSC-A12WV - User Manual

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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Summary

Technical Changes

Model Series Updates

Details modifications and updates for various MSC, MU, MUH, MUX, and MXZ model series.

R410 A Refrigerant Information

Tools & Piping for R410 A

Lists tools and specifications for R410A refrigerant installation and piping.

Part Names and Functions

Indoor & Outdoor Unit Components

Identifies key parts of indoor and outdoor units with diagrams.

Unit Specifications

Detailed Unit Specifications

Comprehensive electrical, mechanical, and performance data for indoor and outdoor units.

Electrical Wiring Diagrams

Indoor and Outdoor Unit Wiring Schematics

Illustrates electrical connections for indoor and outdoor unit control boards.

Refrigerant System Diagrams

Refrigerant Flow Paths

Depicts refrigerant circuit and flow paths for various unit combinations.

Microprocessor Control

Operation Modes and Controls

Explains remote controller functions, displays, and operation modes like Cool, Dry, Heat, I FEEL CONTROL.

Fan, Vane, Timer & Emergency Ops

Details fan motor control, vane operation, timer settings, and emergency test procedures.

Troubleshooting

Diagnostic Procedures and Tables

Outlines diagnostic steps, check tables, and component criteria for resolving issues.

Disassembly Instructions

Indoor and Outdoor Unit Disassembly

Step-by-step instructions with photos for removing unit components.

Parts List

Indoor and Outdoor Unit Parts

Lists structural, electrical, and functional parts for indoor and outdoor units.

Accessories and Optional Parts

Lists accessories, remote controllers, and optional parts like different-diameter pipes.

Mitsubishi Electric MSC-A12WV Specifications