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➲ Refrigerant pipe diameter from branch to branch (B,C,D)
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+D+a+b+c+d+e ≤ 1,000 m
Longest pipe length
L
A+B+C+D+e ≤ 150m(200 m**)
Longest pipe length after 1st branch
l
B+C+D+e ≤ 40m(90 m**)
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 piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
• ** : To apply Conditional Application
Upward Outdoor Unit
total capacity [HP]
5
6, 8
10
12~16
18~22
24
26~34
36~48
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)
Ø19.05(3/4)
Ø19.05(3/4)
Equivalent pipe length
*A+B+C+D+e ≤ 175m(225 m**)
A
Liquid pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Ø9.52(3/8)
Ø15.88(5/8)
Ø9.52(3/8)
Ø19.05(3/4)
Ø9.52(3/8)
Ø22.2(7/8)
1
Ø12.7(1/2)
Ø28.58(1
/
)
8
Ø15.88(5/8)
Ø28.58(1
1
/
)
8
Ø15.88(5/8)
Ø34.9(1
3
/
)
8
Ø19.05(3/4)
Ø34.9(1
3
/
)
8
Ø19.05(3/4)
Ø41.3(1
5
/
)
8
Refrigerant piping installation
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
1
Ø28.58(1
/
)
8
1
Ø28.58(1
/
)
8
3
Ø34.9(1
/
)
8
Ø41.3(1
5
/
)
8
E
Liquid pipe
Upward Outdoor Unit
[mm(inch)]
total capacity [HP]
18, 20, 22
Ø15.88(5/8)
24
Ø19.05(3/4)
26, 28, 30, 32
Ø19.05(3/4)
F
Liquid pipe
Upward Outdoor Unit
[mm(inch)]
total capacity [HP]
6, 8
Ø9.52(3/8)
10
Ø9.52(3/8)
12, 14, 16
Ø12.7(1/2)
Installation Manual 31
Gas pipe
[mm(inch)]
Ø28.58(1
1
/
)
8
Ø34.9(1
3
/
)
8
3
Ø34.9(1
/
)
8
Gas pipe
[mm(inch)]
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1
1
/
)
8
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