Air Evacuation
Note on Adding Refrigerant
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations.
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:
Liquid Side Diameter
R-32
:
(Total pipe length -
standard pipe length)x
12g(0.13oZ)/m(ft)
(Total pipe length -
standard pipe length)x
24g(0.26oZ)/m(ft)
(Total pipe length -
standard pipe length)x
40g(0.42oZ)/m(ft)
φ
6.35(1/4”)
φ
9.52(3/8”)
φ
12.7(1/2”)
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