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Refrigerant Piping
26 Outside Unit
Allowable Length/Height Difference of Refrigerant Piping
n Y Branch Method
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
L150 (492)
H50 (164)
l 40 (131)
[Unit:m(ft)]
h15(49)
Ú Total pipe length = A+B+C+D+a+b+c+d+e ≤ 300m(984ft)
• * :
Assume equivalent pipe length of Y branch to be 0.5m(1.6ft), that of header to be 1m(3.3ft), calculation purpose
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 150m(492ft) * A+B+C+D+e ≤ 175m(574ft)
Longest pipe length after 1st branch
B+C+D+e ≤ 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
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