Service Manual - VMH 18/28/36/48 Series
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CONTENTS
1. Indoor Unit Combination ......................................................................................................................................... 4
2. Dimension Of Outdoor Unit .................................................................................................................................... 7
3. Refrigerant Cycle Diagram ....................................................................................................................................... 9
4. Installation Details ................................................................................................................................................. 12
4.1 Wrench torque sheet for installation ............................................................................................................... 12
4.2 Connecting the cables ...................................................................................................................................... 12
4.3 Pipe length and the elevation ........................................................................................................................... 12
4.4 First-Time Installation ....................................................................................................................................... 12
4.5 Adding Refrigerant after Long-Term System Operation................................................................................... 14
4.6 Procedure when servicing the indoor unit refrigeration circuit. ...................................................................... 14
4.7 Evacuation after servicing the outdoor unit refrigeration circuit .................................................................... 15
5. Electronic Function ................................................................................................................................................ 17
5.1 Abbreviation ..................................................................................................................................................... 17
5.2 Electric Control Working Environment. ............................................................................................................ 17
5.3 Main Protection ................................................................................................................................................ 17
5.4 Control and Functions ...................................................................................................................................... 19
6. Wiring Diagrams ..................................................................................................................................................... 24
7. Troubleshooting ..................................................................................................................................................... 45
7.1Safety ................................................................................................................................................................. 45
7.2 Indoor Unit Error Display................................................................................................................................... 46
7.3 Outdoor Unit Display ........................................................................................................................................ 48
7.4 Diagnosis and Solution ..................................................................................................................................... 54
7.5 Trouble Criterion of Main Parts. ..................................................................................................................... 111
8. Disassembly Instructions ..................................................................................................................................... 121
A-VMH18DU-1 .............................................................................................................................................. 121
A-VMH18DU-1 .............................................................................................................................................. 121
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