Midea MS9A-09HRDN1-QC2 User Manual

SERVICE MANUAL
MIDEA AIRCONDITIONER
DC INVERTER
SPLIT WALL-MOUNTED TYPE
MS9A-09HRDN1-QC2
MS9A-12HRDN1-QC2
V1.0
Oct, 2009

Midea MS9A-09HRDN1-QC2 Specifications

General

Brand	Midea
Model	MS9A-09HRDN1-QC2
Category	Air Conditioner
Language	English

Summary

1. Precaution

1.1 Safety Precaution

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

1.2 Warning

Critical warnings for installation and operation to avoid fire, shock, or injury.

CAUTION Section

Installation Cautions

Important considerations for proper installation to avoid damage or malfunction.

Operational Cautions

Guidelines for operating the unit safely and efficiently to prevent damage.

2. Function

5. Refrigerant cycle diagram

7. Installation details

7.1 Wrench Torque

7.3 Pipe Length and Elevation

7.3.1 Pipe Sizing and Limitations

7.4 Air Purging Procedure

7.5 Pumping Down (Re-installation)

7.5.1 Re-installation Pumping Down Procedure

7.6 Re-air Purging (Re-installation)

7.6.1 Re-installation Re-air Purging Procedure

7.7 Balance Refrigerant of Valves

7.7.1 Balancing Refrigerant of 2-way, 3-way Valves

7.8 Evacuation Procedure

7.8.1 Evacuation Procedure

7.9 Gas Charging Procedure

7.9.1 Gas Charging Procedure

9.3 Protection Functions

9.3.1 Compressor Protection

9.3.2 System Protections

9.5 Cooling Mode

9.7 Heating Mode

9.7.3 Compressor Frequency Control

9.7.3.1 Defrosting Mode Conditions

9.7.7 Defrosting Action

10. Troubleshooting

10.1 Safety Precautions for Troubleshooting

Important safety warnings regarding high voltage capacitors during troubleshooting.

10.1 Indoor Unit Error Display

10.1.1 Error Code Definitions

Table listing display codes (E0-E6, P0-P4) and their corresponding LED status.

10.2 Diagnosis and Solution

10.2.1 E0 Error Diagnosis

Troubleshooting steps for EEPROM parameter errors on the indoor PCB.

10.2.2 E1 Error Diagnosis

Diagnosis and solution for indoor/outdoor unit communication protection issues.

10.2.3 E2 Error Diagnosis

10.2.3.1 E2 Error Diagnosis

Troubleshooting steps for zero-crossing signal errors.

10.2.4 E3 Error Diagnosis

Diagnosis and solution for indoor fan speed out of control.

10.2.5 E5 Error Diagnosis

10.2.5.1 E5 Error Diagnosis

Troubleshooting for open or short circuits in outdoor temperature sensors.

10.2.6 E6 Error Diagnosis

Diagnosis and solution for indoor/evaporator temperature sensor issues.

10.2.7 P0 Error Diagnosis

10.2.7.1 P0 Error Diagnosis

Troubleshooting for IGBT over-strong current protection.

10.2.8 P1 Error Diagnosis

Diagnosis and solution for over voltage or low voltage protection.

10.2.9 P2 Error Diagnosis

10.2.9.1 P2 Error Diagnosis

Troubleshooting for compressor top temperature protection.

10.2.10 P4 Error Diagnosis

Diagnosis and solution for inverter compressor drive errors.

10.3 Key Parts Checking

10.3.1 Compressor Checking

10.3.2 Outdoor Fan Motor Checking

10.3.3 Indoor Fan Motor Checking

10.3.4 Step Motor Checking