Mitsubishi Electric MUZ-GA24NA User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 6
3. SPECIFICATION ················································ 7
4. OUTLINES AND DIMENSIONS ·······················11
5. WIRING DIAGRAM ·········································· 12
6. REFRIGERANT SYSTEM DIAGRAM ············· 20
7. DATA ································································ 23
8. ACTUATOR CONTROL ··································· 37
9. SERVICE FUNCTIONS ··································· 38
10. TROUBLESHOOTING ····································· 38
11. DISASSEMBLY INSTRUCTIONS ···················· 65
12. PARTS LIST ····················································· 72
12-1. PARTS LIST ··········································· 72
12-2. RoHS PARTS LIST ································ 78
13. OPTIONAL PARTS ······················ BACK COVER
Models
MUZ-A09NA,-
1
,-
U1
,-
U2
MUZ-A12NA,-
U1
MUZ-A15NA,-
U1
MUZ-A17NA,-
U1
MUZ-A24NA,-
1
,-
U1
,-
U2
MUY-A15NA
MUY-A17NA
MUY-A24NA
,-
1
,-
U1
,-
U2
MUZ-GA24NA,-
U1
MUY-GA24NA
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Indoor unit service manual
MSZ-A•NA Series (OB450)
MSZ-GA•NA Series (OB450)
MUZ-A09/12/15/17NA
MUY-A15/17NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the PARTS LIST
(RoHS compliant).
TM
HFC
utilized
R410A
No. OB451
REVISED EDITION-E
Revision E:
• MUZ-GA24NA and MUY-GA24NA have
been added.
Please void OB451 REVISED EDITION-D.

Mitsubishi Electric MUZ-GA24NA Specifications

General

Voltage	208/230V
Refrigerant	R-410A
Power Supply	208/230V, 1 Phase, 60Hz
Cooling Capacity	24000 BTU
Heating Capacity	27000 BTU
Cooling Capacity (kW)	7.03 kW
Heating Capacity (kW)	7.91 kW
Operating Temperature Range (Cooling)	115°F

Summary

Introduction and Technical Information

Technical Changes

Details model updates and technical modifications in the service manual.

R410A Refrigerant and Piping

Provides essential information, precautions, tools, and piping specifications for R410A.

Unit Specifications, Performance, and Diagrams

Part Names and Functions

Identifies and describes the main parts of the outdoor unit models.

Specifications and Performance Data

Details unit specs, operating range, performance data, curves, and pressure charts.

Outlines, Dimensions, and Diagrams

Provides unit measurements, clearances, wiring, and refrigerant system diagrams.

Troubleshooting and Service Procedures

Actuator Control and Service Functions

Explains control logic for actuators and specific service functions like defrost settings.

Failure Diagnosis and Troubleshooting

Covers cautions, failure recall, check tables, part criteria, and troubleshooting flows.

Test Point Diagrams and Voltages

Shows test points and voltage measurements on various circuit boards for diagnostics.

Disassembly Instructions

Step-by-step guides for safely disassembling outdoor unit components.

Parts Lists and Optional Parts

Parts Lists

Lists structural, functional, and electrical parts for various models (RoHS and non-RoHS).

Optional Parts

Information on available optional accessories like drain sockets.