Midea M3OF-27HFN1-M User Manual

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CONTENTS
1. Indoor Unit Combination .......................................................................................................................................... 4
2. Dimension Of Outdoor Unit...................................................................................................................................... 6
3. Refrigerant Cycle Diagram ........................................................................................................................................ 8
4. Installation Details .................................................................................................................................................. 11
4.1 Wrench torque sheet for installation ............................................................................................................... 11
4.2 Connecting the cables ...................................................................................................................................... 11
4.3 Pipe length and the elevation ........................................................................................................................... 11
4.4 First-Time Installation ....................................................................................................................................... 11
4.5 Adding Refrigerant after Long-Term System Operation................................................................................... 13
4.6 Procedure when servicing the indoor unit refrigeration circuit. ...................................................................... 13
4.7 Evacuation after servicing the outdoor unit refrigeration circuit .................................................................... 14
5. Electronic Function ................................................................................................................................................. 16
5.1 Abbreviation ..................................................................................................................................................... 16
5.2 Electric Control Working Environment. ............................................................................................................ 16
5.3 Main Protection ................................................................................................................................................ 16
5.4 Control and Functions ...................................................................................................................................... 18
6. Wiring Diagrams ..................................................................................................................................................... 23
7. Troubleshooting ..................................................................................................................................................... 30
7.1Safety ................................................................................................................................................................. 30
7.2 Indoor Unit Error Display................................................................................................................................... 31
7.3 Outdoor Unit Display ........................................................................................................................................ 34
7.4 Diagnosis and Solution ..................................................................................................................................... 39
7.5 Trouble Criterion of Main Parts. ....................................................................................................................... 89
8. Disassembly Instructions ...................................................................................................................................... 100
 M2OF-18HFN1-M (WCA30 metal plate) ................................................................................................. 100
 M3OF-27HFN1-M (WD30 metal plate) .................................................................................................... 107

Midea M3OF-27HFN1-M Specifications

General

Brand	Midea
Model	M3OF-27HFN1-M
Category	Heat Pump
Language	English