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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 additional refrigerant to be
charged can be calculated using the following formula:
CAUTION
Refrigerant charging must be performed after wiring, vacuuming, and the leak testing.
DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system. Doing so
can damage the unit or impact it’s functioning.
Charging with unsuitable substances may cause explosions or accidents. Ensure that the appropriate
refrigerant is used.
Refrigerant containers must be opened slowly. Always use protective gear when charging the system.
DO NOT mix refrigerants types.
For the R290 or R32 refrigerant model, make sure the condtions within the area have been made safe
by control of ammable material when the refrigerant added into air conditioner.
The maximum refrigerant charge amount of R32 is 305 grams.
Note On Adding Refrigerant
ф6.35(1/4") ф9.52(3/8") ф12.7(1/2")
R22
(orice tube in the indoor
unit):
(Total pipe length-
standard pipe length)x
30g (0.32oZ)/(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
R22
(orice tube in the outdoor
unit):
(Total pipe length -
standard pipe length)
x15g(0.16oZ)/ m(ft)
(Total pipe length -
standard pipe length)
x30(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x60g (0.64oZ)/m (ft)
R410A:
(orice tube in the indoor
unit):
(Total pipe length -
standard pipe length)
x30g(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)
(Total pipe length - stan-
dard pipe length)
x 115g(1.23oZ)/m(ft)
R410A:
(orice tube in the outdoor
unit):
(Total pipe length -
standard pipe length)
x15g(0.16oZ)/m(ft)
(Total pipe length -
standard pipe length)
x30g(0.32oZ)/m(ft)
(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)
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)
Liquid Side Diameter
28


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