PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
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ENGLISH
Refrigerant pipe diameter from branch to branch (B,C,D)
• * : Assume equivalent piping length of Y branch to be 0.5 m, that of header to be 1 m,
calculation purpose.
• ** : To apply Conditional Application
Downward Indoor Unit
total capacity [kW(Btu/h)]
Liquid pipe [mm(inch)] Gas pipe [mm(inch)]
≤ 5.6(19,100)
Ø 6.35(1/4) Ø 12.7(1/2)
< 16.0(54,600) Ø 9.52(3/8) Ø 15.88(5/8)
≤ 22.4(76,400)
Ø 9.52(3/8) Ø 19.05(3/4)
< 33.6(114,700) Ø 9.52(3/8) Ø 22.2(7/8)
< 50.4(172,000) Ø 12.7(1/2) Ø 28.58(1-1/8)
< 67.2(229,400) Ø 15.88(5/8) Ø 28.58(1-1/8)
< 72.8(248.500) Ø 15.88(5/8) Ø 34.9(1-3/8)
< 100.8(344,000) Ø 19.05(3/4) Ø 34.9(1-3/8)
< 173.6(592,500) Ø 19.05(3/4) Ø 41.3(1-5/8)
< 184.8(630,700) Ø 22.2(7/8) Ø 44.5(1-3/4)
≤ 252.0 (859,600)
Ø 22.2(7/8) Ø 53.98(2-1/8)
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m
L
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 165 m *A+B+C+D+e ≤ 190 m
l
Longest pipe length after 1st branch
B+C+D+e ≤ 40 m(90 m**)
H
Difference in height (Outdoor Unit ↔ Indoor Unit)
H ≤ 90 m
h
Difference in height (Indoor Unit ↔ Indoor Unit)
h ≤ 30 m
h1
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1 ≤ 5 m
WARNING
When the any one (or both ) of below conditions are satisfied, the diameter of main pipe (A)
must be increased according to below table.
- The equivalent length between outdoor unit and the farthest indoor unit is 90m or more
(Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ↔ Indoor unit) is 50 m or more (Only liquid pipe is in-
creased)
!
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