Midea MSV1-12HRFN1-MT0W User Manual

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Revision A: 1305080001, Content updated.
Model Numbers:
MSV1-09HRFN1-MT0W MSV1-12HRFN1- MT0W
MSV1-12HRDN1-MQ0W MSV1-18HRDN1-MQ0W
MSV1-24HRDN1-MQ0W
VERTU MONO Split DC Inverter
Air Conditioner
SERVICE MANUAL Mono DC
Table of Contents
1. Precaution
2. Part names and functions
3. Dimension
4. Refrigerant Cycle Diagram
5. Wiring Diagram
6. Installation Details
7. Operation Characteristics
8. Electronic function
9. Troubleshooting
10. Exploded view
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.

Midea MSV1-12HRFN1-MT0W Specifications

General

Brand	Midea
Model	MSV1-12HRFN1-MT0W
Category	Air Conditioner
Language	English

Summary

1. Precaution

1.1 Safety Precaution

General safety guidelines to prevent injury to users and property.

1.2 Warning

Specific warnings regarding installation, operation, and electrical hazards.

2. Part Names And Functions

2.1 Model Names of Indoor/Outdoor units

Lists Midea air conditioner models categorized by capacity and type.

2.2 Part names of Indoor/Outdoor units

Identifies and illustrates key components of indoor and outdoor units.

2.3 Functions of Indoor/Outdoor units

Details the various standard and optional functions of the air conditioner.

3. Specification

4. Dimension

4.1 Indoor Unit

Presents dimensions and mounting hole specifications for indoor units.

4.2 Outdoor Unit

Details installation clearances and dimensions for outdoor units.

5. Refrigerant Cycle Diagram

6. Wiring Diagram

6.1 Indoor Unit

Electrical wiring schematics for various indoor unit models.

6.2 Outdoor Unit

Electrical wiring schematics for various outdoor unit models.

7 Installation Details

7.1 Wrench torque sheet for installation

Specifies recommended torque values for pipe connections during installation.

7.2 Connecting the cables

Guidelines for selecting appropriate AWG wire sizes based on appliance amperage.

7.3 Pipe length and the elevation

Details recommended pipe sizes, maximum lengths, and elevations for installation.

7.4 Installation for the first time

Procedures for leak testing and evacuating the refrigerant system.

7.5 Adding the refrigerant after running the system for many years

Procedure for recharging refrigerant in older systems.

7.6 Re-installation while the indoor unit need to be repaired

Steps for collecting refrigerant and re-installing the indoor unit.

7.7 Re-installation while the outdoor unit need to be repaired

Procedures for system evacuation and refrigerant charging during re-installation.

8. Operation Characteristics

9. Electronic Function

9.1 Abbreviation

Defines technical abbreviations for temperatures and other parameters.

9.2 Display function

Explains the meaning of icons and indicators on the indoor unit display.

9.3 Main Protection

Details internal protection mechanisms like compressor delay and temperature limits.

9.4.1 Fan mode

Describes the operation and settings when the unit is in fan-only mode.

9.4.2 Cooling Mode

Explains compressor and fan running rules for cooling operation.

9.4.3 Heating Mode

Explains compressor and fan running rules for heating operation.

9.4.4 Auto-mode

Details how the unit automatically selects cooling, heating, or fan-only modes.

9.4.5 Drying mode

Explains the operational characteristics and protections for drying mode.

9.4.6 Forced operation function

Describes how to enter and operate the unit in forced auto or cooling modes.

9.4.7 Timer function

Explains the setup and operation of the timer functions.

9.4.8 Sleep function mode

Details the energy-saving sleep mode and its operational adjustments.

9.4.9 Auto-Restart function

Describes the unit's behavior and settings after a power failure.

9.4.10 Automatic panel function

Explains the automatic operation of the front panel and louvers.

9.4.11 8℃ Heating(optional)

Details the optional 8°C heating function for maintaining room temperature.

10. Troubleshooting

10.1 Indoor Unit Error Display

Lists error codes displayed on the indoor unit and their meanings.

10.2 Outdoor unit error display

Explains the meanings of LED indicators on the outdoor unit for error display.

10.3.1 EEPROM parameter error diagnosis and solution(E0/E5)

Troubleshooting guide for EEPROM parameter errors (E0/E5).

10.3.2 Indoor / outdoor unit’s communication diagnosis and solution(E1)

Troubleshooting steps for communication errors between indoor and outdoor units (E1).

10.4.3 Zero crossing detection error diagnosis and solution(E2)

Troubleshooting for zero crossing detection errors (E2).

10.4.4 Fan speed has been out of control diagnosis and solution(E3/E7)

Troubleshooting for fan speed control issues (E3/E7).

10.4.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5/E6)

Troubleshooting for temperature sensor faults (E5/E6).

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

Troubleshooting for IPM/IGBT protection errors (P0).

10.4.7 Over voltage or too low voltage protection diagnosis and solution(P1)

Troubleshooting for voltage protection errors (P1).

10.4.8 High temperature protection of compressor top diagnosis and solution(P2)

Troubleshooting for compressor top temperature protection errors (P2).

10.4.9 Inverter compressor drive error diagnosis and solution(P4)

Troubleshooting for inverter compressor drive errors (P4).

Main parts check

1. Temperature sensor checking

Procedure to measure the resistance of various temperature sensors.

2. Compressor checking

Procedure to measure the resistance of compressor windings.

3. IPM continuity check

Method to check the continuity of the IPM module.

4: Indoor AC Fan Motor

Procedure to measure the resistance of the indoor AC fan motor.

5: Pressure On Service Port

Cooling chart:

Tables and chart showing pressure readings for cooling mode at various temperatures.

11. Exploded View(Version of 2013.05.08)

11.1 Indoor unit

Illustrated exploded view and parts list for the indoor unit.

11.2 Outdoor unit

Illustrated exploded view and parts list for outdoor units.

MOC-09HFN1-MTOW, MOC-12HFN1-MTOW

Exploded view and parts list for specific outdoor unit models.

12 Disassembly Instructions

12.1 Indoor unit

Step-by-step guide on how to disassemble the indoor unit components.

12.2 Outdoor unit

Step-by-step guide on how to disassemble outdoor unit components.

MOC-09HFN1-MTOW, MOC-12HFN1-MTOW

Disassembly procedures for specific outdoor unit models.