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Refrigerant piping installation
➲ Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤5.6(19,100)
<16(54,600)
<22.4(76,400)
< 33(112,600)
< 47(160,400)
< 71(242,300)
< 104(354,900)
104(354,900) ≤
➲ Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m
Longest pipe length
L
A+B+b ≤ 150m
Longest pipe length after 1st branch
l
B+b ≤ 40m
Difference in height(Outdoor Unit ↔ Indoor Unit)
H
H ≤ 100m
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 15m
Difference in height (Outdoor Unit ↔ 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.
Upward Outdoor Unit
total capacity [HP]
5
6, 8
10
12~16
18~22
24
26~34
36~48
36
Outdoor Unit
Liquid pipe
[mm(inch)]
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
A
Liquid pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Ø0.52(3/8)
Ø15.88(5/8)
Ø9.52(3/8)
Ø19.05(3/4)
Ø9.52(3/8)
Ø22.2(7/8)
Ø12.7(1/2)
Ø28.58(1
Ø15.88(5/8)
Ø28.58(1
Ø15.88(5/8)
Ø34.9(1
3
Ø19.05(3/4)
Ø34.9(1
3
Ø19.05(3/4)
Ø41.3(1
5
[mm(inch)]
Ø6.35(1/4)
Ø12.7(1/2)
Ø9.52(3/8)
Ø15.88(5/8)
Ø9.52(3/8)
Ø19.05(3/4)
Ø9.52(3/8)
Ø22.2(7/8)
Ø12.7(1/2)
Ø28.58(1
Ø28.58(1
Ø34.9(1
Ø41.3(1
* Equivalent pipe length
A+B+b ≤ 175m
Upward Outdoor Unit
total capacity [HP]
18, 20, 22
24
26, 28, 30, 32
1
/
)
8
1
/
)
8
/
)
Upward Outdoor Unit
8
total capacity [HP]
/
)
8
6, 8
/
)
8
10
12, 14, 16
Gas pipe
1
/
)
8
1
/
)
8
3
/
)
8
5
/
)
8
E
Liquid pipe
[mm(inch)]
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
F
Liquid pipe
[mm(inch)]
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Gas pipe
[mm(inch)]
1
Ø28.58(1
/
)
8
Ø34.9(1
3
/
)
8
Ø34.9(1
3
/
)
8
Gas pipe
[mm(inch)]
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1
1
/
)
8
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