LG ARUN50LH2A Installation Manual page 26

Refrigerant Piping
■ 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)
< 16.0(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
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
CAUTION
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.
26 Outdoor Unit
Z
Branch pipe can not be used after header
Liquid pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Equivalent pipe length(*)
A+B+b ≤ 175m
L 150m
40m
Gas pipe
Ø12.7(1/2)