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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)
< 16.0(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)
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m
Longest pipe length
L
A+B+C+D+e ≤ 165 m
Longest pipe length after 1st branch
l
B+C+D+e ≤ 40 m(90 m**)
Difference in height (Outdoor Unit ↔ Indoor Unit)
H
H ≤ 90 m
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 30 m
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1
h1 ≤ 5 m
• * : 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
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 90 m or more
(Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ↔ Indoor unit) is 50 m or more (Only liquid pipe is
increased)
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
Liquid pipe [mm(inch)]
Ø 6.35(1/4)
Ø 9.52(3/8)
Ø 9.52(3/8)
Ø 9.52(3/8)
Ø 12.7(1/2)
Ø 15.88(5/8)
Ø 15.88(5/8)
Ø 19.05(3/4)
Ø 19.05(3/4)
Ø 22.2(7/8)
Ø 22.2(7/8)
Gas pipe [mm(inch)]
Ø 12.7(1/2)
Ø 15.88(5/8)
Ø 19.05(3/4)
Ø 22.2(7/8)
Ø 28.58(1-1/8)
Ø 28.58(1-1/8)
Ø 34.9(1-3/8)
Ø 34.9(1-3/8)
Ø 41.3(1-5/8)
Ø 44.5(1-3/4)
Ø 53.98(2-1/8)
Equivalent pipe length
*A+B+C+D+e ≤ 190 m
33
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