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43
Air Evacuation
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 25ft. In other
areas, the standard pipe length is 16ft. 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
Connective Pipe
Length (m)
Air Purging
Method
Additional Refrigerant
length
Vacuum
Pump
length
Vacuum
Pump
R32:
R290:
R410A:
R22:
R32:
R290:
R410A:
R22:
CAUTION
DO NOT mix refrigerant types.
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