Midea MEHS-09NIH2 Service Manual page 2

1. Precaution .................................................................................................................................................... 1
1.1 Safety Precaution .......................................................................................................................... 1
1.2 Warning ......................................................................................................................................... 1
2. Part Names And Functions ......................................................................................................................... 4
2.1 Model Names of Indoor/Outdoor units .......................................................................................... 4
3. Dimension .................................................................................................................................................... 5
3.1 Indoor Unit ..................................................................................................................................... 5
3.2 Outdoor Unit .................................................................................................................................. 6
5. Refrigerant Cycle Diagram.......................................................................................................................... 8
6. Wiring Diagram ............................................................................................................................................ 9
6.1 Indoor Unit ..................................................................................................................................... 9
6.2 Outdoor Unit ................................................................................................................................ 11
7 Installation Details ...................................................................................................................................... 17
7.2 Connecting the cables ................................................................................................................. 17
7.3 Pipe length and the elevation ...................................................................................................... 17
7.4 Installation for the first time ......................................................................................................... 18
7.5 Adding the refrigerant after running the system for many years ................................................. 19
7.6 Re-installation while the indoor unit need to be repaired ............................................................ 19
7.7 Re-installation while the outdoor unit need to be repaired .......................................................... 20
8. Operation Characteristics ......................................................................................................................... 22
9. Electronic Function ................................................................................................................................... 23
9.1 Abbreviation ................................................................................................................................. 23
9.2 Display function ........................................................................................................................... 23
9.3 Main Protection ............................................................................................................................ 24
9.4 Operation Modes and Functions ................................................................................................. 25
10. Troubleshooting ....................................................................................................................................... 31
10.1 Indoor Unit Error Display ........................................................................................................... 32
10.2 Outdoor unit error display .......................................................................................................... 33
10.3 Diagnosis and Solution .............................................................................................................. 38
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