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Allowable Length/Height Difference of Refrigerant Piping
I Y Branch Method
Example : 5 Indoor Units connected
: Outdoor Unit
: 1st branch (Y branch)
: Indoor Units
➲ Total pipe length = A+B+C+D+a+b+c+d+e ≤ 300m
Longest pipe length
L
A+B+C+D+e ≤ 150m
Longest pipe length after 1st branch
l
B+C+D+e ≤ 40m
Difference in height(Outdoor Unit ↔ Indoor Unit)
H
H ≤ 50m ( 40m : Outdoor Unit is lower than Indoor Units)
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 15m
• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• ** : Indoor Unit should be installed at lower position than the header
Equivalent pipe length
* A+B+C+D+e ≤ 175m
Refrigerant Piping
L150m
l 40m
Installation Manual 23
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