LG Multi V miniARUN Series Installation Manual page 25

I Combination of Y branch/header method
Example : 5 Indoor Units connected
: Outdoor Unit
: 1st branch (Y branch)
: Y branch
: Indoor Unit
: Header
: Sealed piping
➲ Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤5.6(19,100)
<16(54,600)
<22.4(76,400)
➲ Total pipe length = A+B+C+a+b+c+d+e ≤ 300m
Longest pipe length
L
A+B+b ≤ 150m
Longest pipe length after 1st branch
l
B+b ≤ 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
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.
Branch pipe can not be used after header
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4) Ø12.7(1/2)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
* Equivalent pipe length
A+B+b ≤ 175m
Refrigerant Piping
L 150m
40m
Installation Manual 25