Note On Adding Refrigerant - Airwell DDMX-022N-09M25 User & Installation Manual

Note on Adding Refrigerant

Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, the standard pipe length is 7.5m (25').
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:
R32 :
CAUTION DO NOT
Page 37
 
φ6.35(1/4")
(Total pipe length -
standard pipe length)x
12g(0.13oZ)/m(ft)
mix refrigerant types.
Liquid Side Diameter
φ9.52(3/8") φ12.7(1/2")
(Total pipe length -
standard pipe length)x
24g(0.26oZ)/m(ft)
(Total pipe length -
standard pipe length)x
40g(0.42oZ)/m(ft)