Haier MRV II Instruction Manual page 30

layer of all indoors and outdoors should be connected together, and be
grounded on outdoor at single point, and be grounded on outdoor at single
point.
1.2 Indoor checking
1.2.1 Indoor unit pipe size checking
Model
Gas pipe (mm)
Liquid pipe(mm)
1.2.2 Power cable and signal wire confirmation: Indoor units of one system
use one power supply, The signal wire shielded layer of all indoors and
outdoors should be connected together, and be grounded on outdoor at
single point.
22~45
Φ12.7
Φ6.35
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56~90
Φ15.88
Φ9.52
Part 2
112~140
Φ15.88
Φ9.52