14
Application Information
4) Refrigerant Piping
Maximum Piping Length and Maximum Number of Bends
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 fl ow 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:
Model
Indoor FF(Y)10CXV1 FF(Y)15CXV1 FF(Y)20CXV1
Outdoor R(Y)10CXV1 R(Y)15CXV1 R(Y)18/20CXV1
Max. Length, m 12 12 15
Max. Elevation, m 5 5 8
Max. No. of Bends 10 10 10
Model
Indoor FH(Y)C20EXV1 FH(Y)C25EXV1 FH(Y)C28EXV1
Outdoor R(Y)20CXV1 R(Y)25CXV1 R(Y)28CXV1
Max. Length, m 15 15 15
Max. Elevation, m 8 8 8
Max. No. of Bends 10 10 10
Model
Indoor FH(Y)C40EXV1 FH(Y)C50EXV1
Outdoor R(Y)35/40DXV1 R(Y)40DXY1 R(Y)50DXY1
Max. Length, m 45 45
Max. Elevation, m 25 25
Max. No. of Bends 10 10
Piping sizes (fl are connection type) are as follows:
Model R(Y)10CXV1 R(Y)15CXV1 R(Y)18/20CXV1 R(Y)20CXV1
Liquid, mm / in 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4 6.35 / 1/4
Suction, mm / in 9.52 / 3/8 12.70 / 1/2 15.88 / 5/8 15.88 / 5/8
Model R(Y)25CXV1 R(Y)28CXV1 R(Y)35DXV1
Liquid, mm / in 9.52 / 3/8 9.52 / 3/8 9.52 / 3/8
Suction, mm / in 15.88 / 5/8 15.88 / 5/8 19.05 / 3/4
Model R(Y)40DXV1 R(Y)40DXY1 R(Y)50DXY1
Liquid, mm / in 9.52 / 3/8
Suction, mm / in 19.05 / 3/4
DAIKIN_FF_FHC.indb 14DAIKIN_FF_FHC.indb 14 9/27/2012 2:04:52 PM9/27/2012 2:04:52 PM
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