Huawei NetCol8000-A Quick Manual page 30

Scenarios without a low-temperature component (NetCol8000-A045/A055/A090
Downflow)
• Left pressure gauge is low pressure gauge. Right pressure gauge is high pressure gauge.
• The specification of needle valve is 7/16-20UNF.
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 (NetCol8000-A060/A120
Downflow)
Vacuum
pump
Refrigerant
cylinder
Electronic
scale
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Reducing valve
Nitrogen cylinder
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Reducing valve
Nitrogen
cylinder
Nut
Low-pressure needle valve
Exhaust pipe
needle valve
Nut
29
Low-pressure needle valve
Exhaust pipe
needle valve