Installation Manual
37
Pipe connections between indoor and outdoor unit
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Refrigerant pipe diameter from branch to branch (B,C)
Ú
Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m
Longest pipe length * Equivalent pipe length
A+B+b ≤ 150m(200m**) A+B+b ≤ 175m(225m**)
Longest pipe length after 1st branch
B+b ≤ 40m(90m**)
Difference in height(Outdoor Unit
÷
Indoor Unit)
H ≤ 110m
Difference in height (Indoor Unit
÷
Indoor Unit)
h ≤ 15m
Difference in height (Outdoor Unit
÷
Outdoor Unit)
h1 ≤ 5m
L
l
H
h
h1
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.
• * : 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.
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
< 33.6(114,700) Ø9.52(3/8) Ø22.2(7/8)
< 50.4(172,000) Ø12.7(1/2) Ø28.58(1
1/8
)
< 67.2(229,400) Ø15.88(5/8) Ø28.58(1
1/8
)
< 72.8(248,500) Ø15.88(5/8) Ø34.9(1
3/8
)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(1
3/8
)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(1
5/8
)
< 184.8(630,700) Ø22.2(7/8) Ø44.5(1
3/4
)
< 224.0(764,400) Ø22.2(7/8) Ø53.98(2)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
h
If available on site, it use this size. Otherwise it can't be increased.
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.
Ú
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Outdoor unit
Total capacity
[kW (Btu/h)
Standard Pipe Diameter
Conditional application
(more than 90m from ODU to IDU)
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
16.0~22.4(54,600~76,400)
Φ
9.52(3/8)
Φ
19.05(3/4)
Φ
12.7(1/2)
Φ
22.2(7/8)
28.0(95,900)
Φ
22.2(7/8)
Φ
25.4(1)
33.6~44.8(172,000~152,900)
Φ
12.7(1/2)
Φ
28.58(1 1/8)
Φ
15.88(5/8)
Φ
28.58(1 1/8)
50.4~61.6(172,000~210,600)
Φ
15.88(5/8)
Φ
19.05(3/4)
Φ
31.8(1 1/4)
67.2(229,400)
Φ
34.9(1 3/8)
Φ
34.9(1 3/8)
72.8~95.2(248,500~324,900)
Φ
19.05(3/4)
Φ
22.2(7/8)
Φ
38.1(1 1/2)
100.8~168.0(344,000~573,300)
Φ
41.3(1 5/8)
Φ
41.3(1 5/8)
173.6~179.2(592,500~611,600)
Φ
22.2(7/8)
Φ
44.5(1 3/4)
Φ
25.4(1)
Φ
53.98(2)
184.8~224.0(630,700~764,400)
Φ
53.98(2)
