Classic Air Conditioners MWNC18S - User Manual

RevisionA:1403100001,Contentupdated.
ModelNumbers:
MWNC09S/MRNC09AS,MWHNC09S/MRHNC09AS,MWHNC09SA/MRHNC09ASA
MWNC12S/MRNC12AS,MWHNC12S/MRHNC12AS,MWH NC12SA/MRHNC12ASA
MWNC18S/MRNC18AS,MWHNC18S/MRHNC18AS,
MWNC24S/MRNC24AS,MWHNC24S/MRHNC24AS
COMFORT SERIES DC INVERTER AIR
CONDITIONER
SERVICE MANUAL
Mono DC
Table of Contents
1. Precaution
2. Part Names And Functions
3. Specification
4. Dimension
5. Refrigerant Cycle Diagram
6. Wiring Diagram
7. Installation Details
8. Operation Characteristics
9. Electronic Function
10. Troubleshooting
11. Disassembly Instructions
WARNING
 Installation MUST conform with local building codes or, in the absence of local codes, with the
National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.
 The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
 Installation or repairs made by unqualified persons can result in hazards to you and others.
 Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
 This service is only for service engineer to use.

Summary

Introduction: Model Identification and Warnings

General Safety Warnings

Critical warnings regarding installation, operation, and electrical safety to prevent hazards.

Safety and Precautionary Measures

Safety Precautions

General safety instructions to prevent injury and property damage.

Installation and Operation Warnings

Specific warnings for installation, electrical work, and product usage.

Refrigerant Cycle Diagram

Electrical Wiring Diagrams

Indoor Unit Wiring Diagram

Outdoor Unit Wiring Diagram

Installation Procedures and Guidelines

Pipe Length and Elevation Guidelines

Installation Procedures

Refrigerant Handling Procedures

Troubleshooting and Error Diagnosis

Indoor Unit Error Display

Lists error codes, their causes, and corresponding LED status for indoor units.

Outdoor Unit Error Display

Describes the LED indicator on the outdoor PCB and its meaning for unit status.

Diagnosis and Solution

Provides step-by-step troubleshooting guides for specific error codes and malfunctions.

Classic Air Conditioners MWNC18S Specifications