Refrigerant Piping
28 Outside Unit
n Combination of Y branch/header method
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
L150 (492)
40 (131)
H50 (164)
[Unit:m(ft)]
h15(49)
Branch pipe can not be used after header
Ú Refrigerant pipe diameter from branch to branch (B,C)
Ú Total pipe length = A+B+C+a+b+c+d+e ≤ 300m(984ft)
Longest pipe length * Equivalent pipe length
A+B+b ≤ 150m(492ft) A+B+b ≤ 175m(574ft)
Longest pipe length after 1st branch
B+b ≤ 40m(131ft)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H ≤ 50m(164ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m(49ft)
L
l
H
h
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)
<16(54,600) Ø9.52(3/8) Ø15.88(5/8)
<22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
• * :
Assume equivalent pipe length of Y branch to be0.5m(1.6ft), that of header to be 1m(3.3ft), calculation purpose
WARNING
It is recommended that difference of piping length for pipes connected to the Indoor Unit is
minimized. Performance difference between Indoor Units may occur.
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