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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. 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
Length (m)
Air Purging
Method
Additional Refrigerant
≤
Standard pipe length
Vacuum Pump
N/A
> Standard pipe length
Vacuum Pump
Liquid Side: Ø 6.35 (Ø0.25")
R-32 :
(Pipe length - standard length) x 12g/m
(Pipe length - standard length) x 0,13 oZ/ft
Liquid Side: Ø 9.52 (Ø0.375")
R-32 :
(Pipe length - standard length) x 24g/m
(Pipe length - standard length) x 0,26 oZ/ft
CAUTION:
DO NOT mix refrigerant types.