Mitsubishi Electric MU-12RV User Manual

SERVICE MANUAL
SPLIT-TYPE,AIR CONDITIONERS
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················4
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························7
4. INDOOR UNITS COMBINATION ·······················8
5. SPECIFICATION···············································13
6. NOISE CRITERIA CURVES···························· 19
7. OUTLINES AND DIMENSIONS ······················ 22
8. WIRING DIAGRAM ··········································28
9. REFRIGERANT SYSTEM DIAGRAM··············35
10. PERFORMANCE CURVES······························46
11. MICROPROCESSOR CONTROL···················102
12. SERVICE FUNCTIONS···································120
13. TROUBLESHOOTING····································122
14. DISASSEMBLY INSTRUCTIONS···················148
15. PARTS LIST····················································166
16. OPTIONAL PARTS·········································184
Wireless type
Models
MSC-07RV -
(
WH
)
· MU-07RV -
MSC-09RV -
(
WH
)
· MU-09RV -
MSC-12RV -
(
WH
)
· MU-12RV -
MSC-07RV -
(
WH
)
· MUH-07RV -
MSC-09RV -
(
WH
)
· MUH-09RV -
MSC-12RV -
(
WH
)
· MUH-12RV -
Multi system type
MSC-07RV -
(
WH
)
· MUX-10RV -
MSC-09RV -
(
WH
)
· MUX-18RV -
MSC-12RV -
(
WH
)
· MUX-24RV -
Inverter controlled multi system type
· MXZ-18RV -
· MXZ-32RV -
E1
E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
No. OB227
REVISED EDITION-B
MSC-07RV -
MSC-09RV -
MSC-12RV -
E1
E1
E1
Revision:
• MUX-10/18/24RV - has been added.
• MXZ-18/32RV - has been added.
• Noise criteria curves has been added.
• Performance data has been added.
• Specification has been partially modified.
• Refrigerant system diagram has been partially
modified.
• Please void OB227 REVISED EDITION-A
E1
E1
NOTE: (Only MXZ-32RV - )
This manual describes technical data of MSC
type indoor unit .
For other indoor unit refer to the service manuals
No. OB229 REVISED EDITION-A of correspond-
ing models.
E1

Mitsubishi Electric MU-12RV Specifications

General

Refrigerant	R410A
Power Supply	220-240V, 50Hz
Indoor Unit Noise Level	28-45 dB(A)
Outdoor Unit Dimensions (WxHxD)	780 x 540 x 269 mm
Noise Level (Indoor)	28-45 dB(A)

Summary

1. TECHNICAL CHANGES

Key Model and Feature Updates

Details changes including SW2 addition, SLEEP MODE removal, ECONO COOL addition, and model name updates.

2. PART NAMES AND FUNCTIONS

Indoor Unit Components Overview

Identifies and describes parts of the indoor unit.

Outdoor Unit Components Overview

Identifies and describes parts of the outdoor unit.

3. INDOOR / OUTDOOR CORRESPONDENCE TABLE

MXZ Series Unit Compatibility

Lists valid indoor and outdoor unit combinations for MXZ systems.

4. INDOOR UNITS COMBINATION

MXZ-18RV Combination Data

Provides cooling/heating capacities for MXZ-18RV combinations.

5. SPECIFICATION

Indoor Unit Specifications

Details technical specs for MSC and MUH/MU indoor units.

Outdoor Unit Specifications

Details technical specs for MUH/MU outdoor units.

6. NOISE CRITERIA CURVES

Indoor Unit Noise Levels

Presents noise level data for indoor units (MSC, MU) across frequencies.

7. OUTLINES AND DIMENSIONS

Indoor Unit Dimensions and Installation

Shows physical dimensions and installation requirements for indoor units.

8. WIRING DIAGRAM

Indoor Unit Wiring Diagram

Illustrates the electrical connections for the indoor unit.

9. REFRIGERANT SYSTEM DIAGRAM

MSC/MU Series Refrigerant Flow

Shows refrigerant flow for MSC and MU series units.

10. PERFORMANCE CURVES

Cooling Capacity and Input Curves

Presents graphs showing cooling capacity vs. temperature.

11. MICROPROCESSOR CONTROL

Wireless Remote Controller Operation

Details the functions and buttons of the wireless remote controller.

COOL Operation Details

Describes how to perform COOL operation and related controls.

12. SERVICE FUNCTIONS

Compulsory Defrosting Mode

Describes how to activate compulsory defrosting for service.

13. TROUBLESHOOTING

Cautions on Troubleshooting

Provides important warnings and precautions before troubleshooting.

Instruction of troubleshooting

Provides flowcharts for troubleshooting indoor unit issues.

14. DISASSEMBLY INSTRUCTIONS

Indoor Unit Disassembly Procedures

Provides steps for disassembling indoor units (MSC series).

Outdoor Unit Disassembly - MU Series

Details cabinet and electrical part removal for MU series outdoor units.

Outdoor Unit Disassembly - MXZ Series

Details compressor and fan motor removal for MXZ-18RV.