Air Evacuation
Flare nut
Cap
valve body
valve stem
< Standard pipe length
> Standard pipe
length
≤ Standard pipe length
Caution
7.3 Note on Adding Refrigerant
7. Air Evacuation
Open valve stems gently
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to force the
valve to open further.
Caution
Do not mix refrigerant types.
Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local
regulations. The standard pipe length is 5m (16‘). The additional refrigerant to be charged can be calculated using the
following formula:
Addutional Refrigerant per Pipe Length
Air Purging
Method
Vacuum Pump
Vacuum Pump
Fixed-frequency R410A & R32:
Inverter R410A & R32:
Liquid Side:φ6.35
(Pipe length – standard length) x 15g/m
(Pipe length – standard length) x 15g/m
Liquid Side:φ9.52
Inverter R410A & R32:
Fixed-frequency R410A & R32:
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 30g/m
Connective Pipe
Length (m)
Additional Refrigerant
N/A
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