Scenarios without a low-temperature component (Upflow)
Vacuum
pump
Refrigerant
cylinder
Electronic
scale
Scenarios without a low-temperature component (Upflow)
Vacuum
pump
Refrigerant
cylinder
Electronic
scale
Reducing valve
Nitrogen cylinder
Reducing valve
Nut
Nitrogen cylinder
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Low-pressure needle valve
Nut
Exhaust pipe needle valve
1. Leak checking
2. Vacuuming
3. Precharging refrigerant
Low-pressure needle valve
Liquid pipe
Exhaust pipe
needle valve
needle valve
21