Refrigerant pipe diameter from branch to branch (B,C,D)
• * : Assume equivalent piping length of Y branch to be 0.5m(1.6ft), that of header to be
1m(3.3ft), 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)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤ 22.4(76,400)
Ø9.52(3/8) Ø19.05(3/4)
< 33.6(114,700) Ø9.52(3/8) Ø22.2(7/8)
< 50.4(172,000) Ø12.7(1/2) Ø28.58(1-1/8 )
< 67.2(229,400) Ø15.88(5/8) Ø28.58(1-1/8 )
< 72.8(248.500) Ø15.88(5/8) Ø34.9(1-3/8)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(1-3/8)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(1-5/8)
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1000m(3281ft)
L
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 150m(492ft)[200m(656ft)**] *A+B+C+D+e ≤ 175m(574ft)[225m(738ft)**]
l
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(131ft)[90m(295ft)**]
H
Difference in height(Outdoor Unit ÷ Indoor Unit)
H ≤ 110m(361ft)
h
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 40m(131ft)
h1
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1 ≤ 5m(16.4ft)
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(295ft) or
more (Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ÷ Indoor unit) is 50m(164ft) or more (Only liquid pipe is
increased)
!
30
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH
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