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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
Diameter
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
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)
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)
Increased Pipe Diameter
When level difference is
50 m or more
Gas pipe
Liquid pipe
[mm(inch)]
[mm(inch)]
Ø 22.2(7/8)
Ø 12.7(1/2)
Ø 25.4(1)
Ø 12.7(1/2)
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)
Ø 22.2(7/8)
not increased
Ø 22.2(7/8)
Ø 53.98(2-1/8)
Ø 25.4(1)
not increased
Ø 25.4(1)
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)
Gas pipe
[mm(inch)]
not increased
not increased
not increased
not increased
not increased
not increased
not increased
not increased
not increased
not increased
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