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Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
≤ 22.4(76,400)
< 33.6(114,700)
< 50.4(172,000)
< 67.2(229,400)
< 72.8(248,500)
< 100.8(344,000)
< 173.6(592,500)
< 184.8(630,700)
< 224.0(764,400)
Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m
Longest pipe length
L
A+B+b ≤ 150m(200m**)
Longest pipe length after 1st branch
l
B+b ≤ 40m(90m**)
Difference in height(Outdoor Unit
H
H ≤ 110m
Difference in height (Indoor Unit
h
h ≤ 15m
Difference in height (Outdoor Unit
h1
h1 ≤ 5m
• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• Indoor Unit should be installed at lower position than the header.
WARNING
It is recommended that difference of piping length for pipes connected to the Indoor Unit is
minimized. Performance difference between Indoor Units may occur.
WARNING
If overall equivalent pipe length is more than 90m from ODU to the longest IDU,
The diameter of the main pipe (Gas and Liquid pipes) must be increased as follow.
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Outdoor unit
Total capacity
[kW (Btu/h)
16.0~22.4(54,600~76,400)
28.0(95,900)
33.6~44.8(172,000~152,900)
50.4~61.6(172,000~210,600)
67.2(229,400)
72.8~95.2(248,500~324,900)
100.8~168.0(344,000~573,300)
173.6~179.2(592,500~611,600)
184.8~224.0(630,700~764,400)
available on site, it use this size. Otherwise it can't be increased.
Pipe connections between indoor and outdoor unit
Liquid pipe
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Ø22.2(7/8)
Ø22.2(7/8)
* Equivalent pipe length
A+B+b ≤ 175m(225m**)
Indoor Unit)
Indoor Unit)
Outdoor Unit)
Standard Pipe Diameter
Liquid pipe
Gas pipe
[mm (inch)]
[mm (inch)]
Ö19.05(3/4)
F 9.52(3/8)
Ö22.2(7/8)
Ö12.7(1/2)
Ö28.58(1 1/8)
Ö15.88(5/8)
Ö34.9(1 3/8)
Ö19.05(3/4)
Ö41.3(1 5/8)
Ö44.5(1 3/4)
Ö22.2(7/8)
Ö53.98(2)
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1
)
1/8
Ø28.58(1
)
1/8
Ø34.9(1
)
3/8
Ø34.9(1
)
3/8
Ø41.3(1
)
5/8
Ø44.5(1
)
3/4
Ø53.98(2)
Conditional application
(more than 90m from ODU to IDU)
Liquid pipe
Gas pipe
[mm (inch)]
[mm (inch)]
Ö22.2(7/8)
Ö12.7(1/2)
Ö25.4(1)
Ö15.88(5/8)
Ö28.58(1 1/8)
Ö31.8(1 1/4)
Ö19.05(3/4)
Ö34.9(1 3/8)
Ö38.1(1 1/2)
Ö22.2(7/8)
Ö41.3(1 5/8)
Ö25.4(1)
Ö53.98(2)
Installation Manual 37
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