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:
CAUTION:
DO NOT
mix refrigerant types.
Liquid Side Diameter
R32 :
(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”)
(Total pipe length
- standard pipe
length) x 65g
(0.69oZ) / m(ft)
R410A:
(orifice tube in the indoor
unit):
(Total pipe length
- standard pipe
length) x 30g
(0.32oZ) /m(ft)
(Total pipe length
- standard pipe
length) x 65g
(0.69oZ) /m(ft)
(Total pipe length
- standard pipe
length) x 115g
(1.23oZ) /m(ft)
R410A:
(orifice tube in the outdoor
unit):
(Total pipe length
- standard pipe
length) x 15g
(0.16oZ) / m(ft)
(Total pipe length
- standard pipe
length) x 30g
(0.32oZ) /m(ft)
36
V.1
