Huawei NetCol8000-A Series Quick Manual page 20

Scenarios without a low-temperature component (Downflow)
Vacuum pump
Refrigerant cylinder
Electronic
scale
The figures use a single-system unit as an example. You need to perform leak checking,
vacuuming, and precharging refrigerant on both systems of a dual-system unit.
Scenarios without a low-temperature component (Downflow)
Vacuum pump
Refrigerant cylinder
Electronic
scale
•
Left pressure gauge is low pressure gauge. Right
pressure gauge is high pressure gauge.
•
The specification of needle valve is 7/16-20UNF.
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Reducing valve
Nitrogen cylinder
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Reducing valve
Nut
Nitrogen cylinder
Nut
20
Low-pressure needle valve
Exhaust pipe
needle valve
Low-pressure needle valve
Exhaust pipe needle valve
Liquid pipe needle valve