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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
34
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)
< 224.0(764,400)
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m
Longest pipe length
L
A+B+C+D+e ≤ 150m(200m**)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(90m**)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 110m
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 40m
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 5m
• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m,
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 90m or more
(Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ÷ Indoor unit) is 50m or more (Only liquid pipe is in-
creased)
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)
Equivalent pipe length
*A+B+C+D+e ≤ 175m(225m**)
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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