Mitsubishi Electric MSZ-HM24NA-U1 User Manual

Outdoor unit service manual
MUZ-HM•NA Series (OBH747)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB746)
MSZ-HM24NA
INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
Models
MSZ-HM09NA
-
U1
MSZ-HM12NA
-
U1
MSZ-HM15NA
-
U1
MSZ-HM18NA
-
U1
MSZ-HM24NA
-
U1
CONTENTS
1. TECHNICAL CHANGES
·······································
2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM ············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ····································· 16
10. DISASSEMBLY INSTRUCTIONS ···················· 30
No. OBH746
REVISED EDITION-B
Please void OBH746 REVISED EDITION-A.
Revision B:
• 3-1. OPERATING RANGE has been modified.

Mitsubishi Electric MSZ-HM24NA-U1 Specifications

General

Brand	Mitsubishi Electric
Model	MSZ-HM24NA-U1
Category	Air Conditioner
Language	English

Summary

Specifications

Performance and Electrical Specifications

Wiring Diagram

Indoor Unit Electrical Connections

Refrigerant System Diagram

Refrigerant Circuit and Component Layout

Microprocessor Control

Wireless Remote Controller Operation

Cooling Operation Modes and Coil Frost Prevention

Details the cooling mode, temperature selection, and coil frost prevention.

Dry and Heat Operation Modes

Covers dry mode operation and heat mode functions including cold air prevention.

Auto Vane Operation and Settings

Emergency, Test, and Time Delay Operations

Troubleshooting

Troubleshooting Cautions and Procedures

Provides safety guidelines and initial checks before troubleshooting.

Failure Mode Recall Function

Explains how to recall and interpret error codes from the unit.

Troubleshooting Flowcharts

Guides through systematic checks for common issues using flowcharts.

Troubleshooting Check Table

Lists symptoms, conditions, and remedies for various error points.

Component Trouble Criteria

Provides resistance and voltage criteria for diagnosing main parts.

Specific Component Troubleshooting Flows

Details troubleshooting steps for indoor fan motor, PC boards, and wiring.

Test Point Diagrams and Voltages

Disassembly Instructions

Panel Removal and Terminal Detaching

Internal Component Removal Procedures