4) Refrigerant Piping
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends
increase, resistance to ow of refrigerant system increases, thus lowering cooling capacity and as a result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Model
Indoor FFN10CV1 FFN15CV1 FCN20FV1
Outdoor RN10FV1 RN15FV1 RN20CV1
Max. allowable length, m 20 20 30
Max. allowable elevation, m 10 10 15
Liquid pipe size, mm / in 6.35 / 1/4” 6.35 / 1/4” 6.35 / 1/4”
Gas pipe size, mm / in 9.52 / 3/8” 12.70 / 1/2” 12.70 / 1/2”
Model
Indoor FCN25FV1 FCN30FV1
Outdoor RN25CV1 RN28CV1 RN30CV1
Max. allowable length, m 30 25 45
Max. allowable elevation, m 15 8 25
Liquid pipe size, mm / in 6.35 / 1/4” 9.52 / 3/8” 9.52 / 3/8”
Gas pipe size, mm / in 15.88 / 5/8” 15.88 / 5/8” 15.88 / 5/8”
Model
Indoor FCN35FV1 FCN40FV1 FCN50FV1
Outdoor RN35DV1 RN40DY1 RN50DY1
Max. allowable length, m 50 50 50
Max. allowable elevation, m 30 30 30
Liquid pipe size, mm / in 9.52 / 3/8” 9.52 / 3/8” 9.52 / 3/8”
Gas pipe size, mm / in 15.88 / 5/8” 15.88 / 5/8” 15.88 / 5/8”
5) Additional Charge
• The refrigerant charge has already charged into the outdoor unit. For the piping length of 7.5m, additional
refrigerant charge after vacuuming is not necessary.
• When the piping length is more than 7.5m, please use the table below (unit in gram).
Cooling Only
Indoor
FFN10CV1 FFN15CV1
FCN20FV1
Outdoor RN10FV1 RN15FV1 RN20CV1
Add. Charge, g/m 18 18 22
Indoor FCN25FV1 FCN30FV1
Outdoor RN25CV1 RN28CV1 RN30CV1
Add. Charge, g/m 10 24 24
Indoor FCN35FV1 FCN40FV1 FCN50FV1
Outdoor RN35DV1 RN40DY1 RN50DY1
Add. Charge, g/m 27 24 24
Example: FCN25FV1 & RN25CV1 with 13m piping length, additional piping length is 5.5m. Thus,
Additional Charge = 5.5m x 10 g/m
= 55g
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