Pipe connections between indoor and outdoor unit
➲
Refrigerant pipe diameter from branch to branch (B,C,D)
➲
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m
• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
• ** : To apply Conditional Application
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)]
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 150m(200 m**) *A+B+C+D+e ≤ 175m(225 m**)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(90 m**)
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
32
Outdoor Unit
❈
If available on site, it use this size. Otherwise it can't be increased.
➲
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)
