Table Of Contents - Midea MSG-09CR-QC3 Service Manual

1. Precaution .................................................................................................................... 1
1.1 Safety Precaution ...................................................................................................................... 1
1.2 Warning ..................................................................................................................................... 1
2. Function ....................................................................................................................... 3
3. Dimension .................................................................................................................... 5
3.1 Indoor unit .................................................................................................................................. 5
3.2 Outdoor unit ............................................................................................................................... 6
4. Specification ................................................................................................................ 7
5. Refrigerant cycle diagram ........................................................................................... 9
6. Operation limits ......................................................................................................... 10
6.1 Cooling operation ..................................................................................................................... 10
6.2 Heating operation .................................................................................................................... 10
7. Schematic diagram and Wiring diagram ................................................................. 11
7.1 Schematic diagram ................................................................................................................... 11
7.2 Wiring diagram ......................................................................................................................... 12
8. Installation details ...................................................................................................... 18
8.1 Wrench torque sheet for installation ......................................................................................... 18
8.2 Connecting the cables ............................................................................................................. 18
8.3 Pipe length and the elevation ................................................................................................... 18
8.4 Air purging of the piping and indoor unit .................................................................................. 19
8.5 Pumping down (Re-installation) ............................................................................................... 20
8.6 Re-air purging (Re-installation) ................................................................................................ 21
8.7 Balance refrigerant of the 2-way, 3-way valves ........................................................................ 22
8.8 Evacuation ............................................................................................................................... 23
8.9 Gas charging ........................................................................................................................... 24
9. Capacity table ............................................................................................................ 25
9.1 MSG-09CR-QC3 ...................................................................................................................... 25
9.2 MSG-09HR-QC3 ...................................................................................................................... 25
9.3 MSG-12CR-QC2 ...................................................................................................................... 26
9.4 MSG-18CR-QB9 ...................................................................................................................... 27
9.5 MSG-18HR-QB9 ...................................................................................................................... 27
10. Electronic function .................................................................................................... 28
10.1 Electronic control working environment ................................................................................... 28
10.2 Proper symbols and their meaning .......................................................................................... 28
10.3 Function ................................................................................................................................... 28
10.4 Protection ................................................................................................................................. 29
10.5 Fan-only mode ......................................................................................................................... 29
10.6 Cooling mode ........................................................................................................................... 29
10.7 Dehumidifying mode ................................................................................................................ 30
10.8 Heating mode .......................................................................................................................... 31
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