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24 Outside Unit
Refrigerant piping system
Header branch method
n Header Method
Example : 6 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : 1st branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
L70 (230)
H30 (98.4)
40 (131)
h15 (49)
[Unit:m(ft)]
WARNING
Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes connected to the Indoor Units is mini-
mized. Performance difference between Indoor Units may occur.
• * : Assume equivalent pipe length of Y branch to be 0.5m (1.6ft), that of header to be 1m (3.3ft), calcu-
lation purpose
Longest pipe length * Equivalent pipe length
A+f ≤ 70m (230ft) A+f ≤ 90m (295.2ft)
Longest pipe length after 1st branch
f ≤ 40m (131ft)
Difference in height(Outside Unit ÷ Indoor Unit)
H ≤ 30m (98.4ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 15m (49ft)
L
l
H
h
Ú Total pipe length = A+a+b+c+d+e+f ≤ 145m (475.7ft)
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