11
Application Information
Refrigerant Piping
Piping Length and Elevation
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases,
system piping resistance to the refrigerant flow increases, thus lowering the cooling capacity, and as the result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Outdoor Unit
L
E
Indoor Unit
Cooling Model
P/QS/PS Series
Model
Indoor
FTN10P/QS
FTN15P/QS
FTN20P/QS
FTN25P/QS
Outdoor
RN10F
RN15F
RN20C
RN25C
Min.Allowable Length (L), m
3
Max.Allowable Length (L), m
25
25
30
30
Max.Allowable Elevation (E), m
15
Gas Pipe Size, mm/(in)
9.52 (3/8”)
12.70 (1/2”)
12.70 (1/2”)
15.88 (5/8”)
Liquid Pipe Size, mm/(in)
6.35 (1/4”)
Model
Indoor
FTN25P/QS
FTN30PS
FTN35PS
Outdoor
RN25CH
RN30C
RN35D
Min.Allowable Length (L), m
3
3
3
Max.Allowable Length (L), m
35
45
50
Max.Allowable Elevation (E), m
15
25
30
Gas Pipe Size, mm/(in)
15.88 (5/8”)
15.88 (5/8”)
15.88 (5/8”)
Liquid Pipe Size, mm/(in)
6.35 (1/4”)
9.52 / (3/8”)
9.52 / (3/8”)
