Classic Air Conditioners MWNC12S - 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

1. Precaution

1.1 Safety Precaution

Instructions to prevent injury and property damage during operation and installation.

1.2 Warning

Critical warnings regarding electrical hazards, installation, and operational safety guidelines.

6. Wiring Diagram

6.1 Indoor Unit

6.2 Outdoor Unit

7 Installation Details

7.1 Wrench torque sheet for installation

7.2 Connecting the cables

7.3 Pipe length and the elevation

7.4 Installation for the first time

9. Electronic Function

9.3 Main Protection

9.4 Operation Modes and Functions

10. Troubleshooting

10.1 Indoor Unit Error Display

Lists error codes displayed on the indoor unit and their corresponding causes and LED status.

10.2 Outdoor unit error display

Explains the LED indicators on the outdoor PCB and their relation to unit malfunctions.

10.3.1 EEPROM parameter error diagnosis and solution(E0;F4)

Provides a diagnostic flowchart and solution for EEPROM parameter errors (E0/F4).

10.4.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)

Outlines troubleshooting steps for IPM malfunction or over-current protection errors (P0).

Main parts check

Classic Air Conditioners MWNC12S Specifications