LG ARUN50LH2A Installation Manual page 24

Refrigerant Piping
Allowable Length/Height Difference of Refrigerant Piping
■ 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
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
CAUTION
Indoor Unit should be installed at lower position than the header
24 Outdoor Unit
Equivalent pipe length(*)
A+B+C+D+e ≤ 175m
L150m
l 40m