Huawei NetCol8000-A045D Quick Manual page 39

Scenario Without a Low Temperature Component
(NetCol8000-A045/A055/A090 Downflow)
•
The pressure gauge on the left is a low-pressure gauge, and the one on the right is a
high-pressure gauge.
• The needle valve specification 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.
Scenario 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
38
Low-pressure needle valve
Exhaust pipe
needle valve