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ENGLISH
Installation Manual 25
Refrigerant piping system
Y/Header branch method
n Combination of Y branch/header method
Example : 5 Indoor Units connected
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
L70 (230)
40 (131)
H30 (98.4)
[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 ≤ 145m (475.7ft)
Longest pipe length * Equivalent pipe length
A+B+b ≤ 70m (230ft) A+B+b ≤ 90m (295.2ft)
Longest pipe length after 1st branch
B+b ≤ 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
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)]
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.
* :
Assume equivalent pipe length of Y branch to be 0.5m (1.6ft), that of header to be 1m (3.3ft), calculation purpose.
CAUTION
It is recommended that indoor unit is installed at lower position than the header.
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