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Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25').
In other areas, the standard pipe length is 5m (16'). The refrigerant should be charged from the service
port on the outdoor unit's low pressure valve. The additional refrigerant to be charged can be
calculated using the following formula:
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe
Air Purging
Additional Refrigerant
Length (m)
Method
< Standard pipe length Vacuum Pump
N/A
Liquid Side: Ø 6.35 (ø 0.25")
Liquid Side: Ø 9.52 (ø 0.375")
> Standard pipe
Vacuum Pump
R32:
R32:
length
(Pipe length – standard length) x 12g/m
(Pipe length – standard length) x 24g/m
(Pipe length – standard length) x 0.13oZ/ft
(Pipe length – standard length) x 0.26oZ/ft
CAUTION
mix refrigerant types.
DO NOT
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