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