Mitsubishi SUZ-KA18NA2 User Manual

SERVICE MANUAL
R410A
Outdoor unit
[Model Name]
SUZ-KA18NA2
SUZ-KA18NAH2
SUZ-KA24NA
SUZ-KA24NAH2
SUZ-KA30NA
SUZ-KA30NAH2
SUZ-KA36NA
SUZ-KA36NAH2
[Service Ref.]
SUZ-KA18NA(H)2.TH
SUZ-KA24NA(H)2.TH
SUZ-KA30NA(H)2.TH
SUZ-KA36NA(H)2.TH
PARTS CATALOG (OCB688)
CONTENTS
1. COMBINATION OF INDOOR AND OUTDOOR UNITS
...
2
2. PART NAMES AND FUNCTIONS
......................
2
3. SPECIFICATION
.................................................
3
4. OUTLINES AND DIMENSIONS
..........................
4
5. WIRING DIAGRAM
............................................
5
6. REFRIGERANT SYSTEM DIAGRAM
................
9
7. DATA
..................................................................
11
8. ACTUATOR CONTROL
.....................................
14
9. SERVICE FUNCTIONS
......................................
15
10. TROUBLESHOOTING
.......................................
15
11. FUNCTION SETTING
........................................
32
12. DISASSEMBLY INSTRUCTIONS
......................
35
Note:
• This manual describes service
data of the outdoor units only.
No. OCH688
REVISED EDITION-A
May 2019
SPLIT-TYPE, AIR CONDITIONERS
SUZ-KA18NA(H)2.TH
Revision:
• Some descriptions
have been modified in
REVISED EDITION-A.
OCH688 is void.

Mitsubishi SUZ-KA18NA2 Specifications

General

Brand	Mitsubishi
Model	SUZ-KA18NA2
Category	Air Conditioner
Language	English

Summary

Indoor and Outdoor Unit Combinations

Outdoor Unit Specifications

Wiring Diagrams

Wiring Diagram for SUZ-KA18NA2.TH

Illustrates the electrical connections for the SUZ-KA18NA2.TH outdoor unit.

Wiring Diagram for SUZ-KA18NAH2.TH

Illustrates the electrical connections for the SUZ-KA18NAH2.TH outdoor unit.

Wiring Diagrams for SUZ-KA24NA2.TH, SUZ-KA30NA2.TH, SUZ-KA36NA2.TH

Illustrates electrical connections for multiple outdoor unit models.

Wiring Diagrams for SUZ-KA24NAH2.TH, SUZ-KA30NAH2.TH, SUZ-KA36NAH2.TH

Illustrates electrical connections for multiple outdoor unit models.

Refrigerant System Diagrams

Refrigerant System Diagram for SUZ-KA18NA(H)2.TH

Refrigerant System Diagrams for SUZ-KA24/30/36NA(H)2.TH

Refrigerant Piping and Charge Information

Operation Data

Standard Operation Data

Standard Operation Data (Continued)

Service Functions

Troubleshooting

Troubleshooting Precautions

Outlines safety precautions and general steps before starting troubleshooting.

Troubleshooting Check Table

Lists symptoms, LED indications, conditions, and remedies for various unit errors.

Self-Diagnosis Procedure

Step-by-step guide to accessing and clearing error history via self-diagnosis.

Remote Controller Diagnostics

Wireless Remote Controller Self-Diagnosis

Procedure for self-diagnosis using a wireless remote controller during operation.

Troubleshooting Check Codes

Details check codes for indoor unit errors (Output pattern A) and outdoor unit errors (Output pattern B).

Trouble Criteria for Main Parts

Provides resistance values and check methods for key components like thermistors and motors.

Troubleshooting Flow: Inverter/Compressor Check

Flowchart for diagnosing inverter and compressor issues, including open phase checks.

Troubleshooting Flow: Compressor Winding and Operation

Guides checking compressor winding resistance, operation time, and start failure.

Troubleshooting Flow: Outdoor Thermistors and R.V. Coil

Troubleshooting Flow: Outdoor Fan Motor and Power Supply

Troubleshooting Flow: LEV and Inverter P.C. Board

Troubleshooting Flow: Miswiring and Serial Signal Error

Troubleshooting: Defrost Heater and Refrigerant Circuit

Test Point Diagrams and Voltage Charts

Inverter P.C. Board Test Points (SUZ-KA18NA(H)2.TH)

Thermistor Resistance Charts

Inverter P.C. Board Test Points (SUZ-KA24/30/36NA(H)2.TH)

Function Settings

Unit Function Settings via Remote Controller

Selecting Functions via Wired Remote Controller