LG MULTI V MINI ARUN Série Guide D'installation page 27

Allowable Length/Height Difference of Refrigerant Piping
I 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(984ft)
Longest pipe length
L
A+B+C+D+e ≤ 150m(492ft)
Longest pipe length after 1st branch
l
B+C+D+e ≤ 40m(131ft)
Difference in height(Outdoor Unit ↔ Indoor Unit)
H
H ≤ 50m(164ft), 40m(131ft) : Outdoor Unit is lower than Indoor Units
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 15m(49ft)
• * : Assume equivalent pipe length of Y branch to be 0.5m(1.6ft), that of header to be 1m(3.3ft), calculation purpose
• ** : Indoor Unit should be installed at lower position than the header
h15(49)
Equivalent pipe length
* A+B+C+D+e ≤ 175m(574ft)
Refrigerant Piping
[Unit:m(ft)]
L150 (492)
l 40 (131)
Installation Manual 27