Huawei NetCol5000-A021HN12D 20020E1 Quick Manual page 13

1. Exhaust nitrogen.
Remove the bonnets of the liquid, low-pressure,
and needle valve of the discharge pipes in turn.
2. Connect refrigerant pipes.
a. Use the weld gun to remove the
closures from the refrigerant pipes.
b. Weld the two straight pipes available in
the fitting bag to the gas and liquid
pipes.
3. Outdoor unit exhausting nitrogen and connection diagrams
Thermal insulation foam
Low-pressure
needle valve
Liquid
pipe
needle
valve
Liquid pipe Gas pipe
Gas pipe
12
Discharge pipe needle valve
Liquid pipe