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Installation Manual 31
ENGLISH
Refrigerant piping installation
Ú Refrigerant pipe diameter from branch to branch (B,C)
Ú Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m(3,281 ft)
Longest pipe length * Equivalent pipe length
A+B+b ≤ 150m(492ft) A+B+b ≤ 175m(574ft)
Longest pipe length after 1st branch
B+b ≤ 40m(131ft)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H ≤ 100m(328ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m(49ft)
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1 ≤ 5m(16ft)
L
l
H
h
h1
Downward Indoor Unit total capacity
[kW(Btu/h)]
<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(1.6ft), that of header to be 1m(3.3ft), 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]
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]
20, 22, 24 Ø15.88(5/8) Ø28.58)(1-1/8)
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]
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)]
Ⓕ
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