Refrigerant Piping - Daikin P Series Technical Manual

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:
Cooling Model
P/QS/PS Series
Indoor
Model
Outdoor
Min.Allowable Length (L), m
Max.Allowable Length (L), m
Max.Allowable Elevation (E), m
Gas Pipe Size, mm/(in)
Liquid Pipe Size, mm/(in)
Indoor
Model
Outdoor
Min.Allowable Length (L), m
Max.Allowable Length (L), m
Max.Allowable Elevation (E), m
Gas Pipe Size, mm/(in)
Liquid Pipe Size, mm/(in)
Indoor Unit
Outdoor Unit
FTN10P/QS FTN15P/QS
RN10F RN15F
25 25
9.52 (3/8") 12.70 (1/2")
FTN25P/QS FTN30PS
RN25CH RN30C
3 3
35 45
15 25
15.88 (5/8") 15.88 (5/8")
6.35 (1/4") 9.52 / (3/8")
L E
FTN20P/QS
RN20C
3
30
15
12.70 (1/2")
6.35 (1/4")
FTN35PS
RN35D
3
50
30
15.88 (5/8")
9.52 / (3/8")
Application Information
FTN25P/QS
RN25C
30
15.88 (5/8")
11