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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
34
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward
Standard Pipe
Outdoor unit
total capacity
Liquid pipe
HP
[mm(inch)]
8
Ø 9.52(3/8)
10
Ø 9.52(3/8)
12 ~ 14
Ø 12.7(1/2)
16
Ø 12.7(1/2)
18 ~ 22
Ø 15.88(5/8) Ø 28.58(1-1/8) Ø 19.05(3/4)
24
Ø 15.88(5/8)
26 ~ 34
Ø 19.05(3/4)
36 ~ 60
Ø 19.05(3/4)
62 ~ 64
Ø 22.2(7/8)
66 ~ 88
Ø 22.2(7/8)
(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)
Downward indoor unit
total capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0 (54,600)
≤ 22.4 (76,400)
< 33.6 (114,700)
< 50.4 (172,000)
< 67.2 (229,400)
< 72.8(248,500)
< 100.8(344,000)
< 173.6(592,500)
< 184.8(630,700)
≤ 252.0(859,600)
When equivalent pipe length is 90 m
Diameter
or more from ODU to farthest IDU
Gas pipe
Liquid pipe
[mm(inch)]
[mm(inch)]
Ø 19.05(3/4)
Ø 12.7(1/2)
Ø 22.2(7/8)
Ø 12.7(1/2)
Ø 28.58(1-1/8) Ø 15.88(5/8) not increased
Ø 28.58(1-1/8) Ø 15.88(5/8)
Ø 34.9(1-3/8)
Ø 19.05(3/4) not increased
Ø 34.9(1-3/8)
Ø 22.2(7/8)
Ø 41.3(1-5/8)
Ø 22.2(7/8)
Ø 44.5(1-3/4)
Ø 25.4(1)
Ø 53.98(2-1/8)
Ø 25.4(1)
Increased Pipe Diameter
Gas pipe
[mm(inch)]
Ø 22.2(7/8)
Ø 25.4(1)
Ø 15.88(5/8)
Ø 31.8(1-1/4)
Ø 15.88(5/8)
Ø 31.8(1-1/4)
Ø 19.05(3/4)
Ø 19.05(3/4)
Ø 38.1(1-1/2)
not increased
Ø 53.98(2-1/8)
not increased
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)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Ø22.2(7/8)
Ø22.2(7/8)
When level difference is
50 m or more
Liquid pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Ø 12.7(1/2)
not increased
Ø 12.7(1/2)
not increased
not increased
not increased
not increased
not increased
Ø 22.2(7/8)
not increased
Ø 22.2(7/8)
not increased
Ø 25.4(1)
not increased
Ø 25.4(1)
not increased
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Ø44.5(1-3/4)
Ø53.98(2-1/8)
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