LG MULTI V PLUS ARUV Series Installation Manual page 33

Header Method
Example : 6 indoor units connected
: Outdoor unit
: 1st branch
: Indoor units
: Sealed piping
Example : 6 indoor units connected
: Outdoor unit
: 1st branch
: Indoor unit
: Sealed piping
: Connection branch pipe
between outdoor units:
ARCNN30
: Connection branch pipe
between outdoor units:
ARCNN20
Total pipe length = A+a+b+c+d+e+f ≤ 300m
Longest pipe length
L
A+f ≤ 150m
Longest pipe length after 1st branch
l
f ≤ 40m
Difference in height(outdoor unit
H
H ≤ 50m (40m : outdoor unit is lower)**
Difference in height (indoor unit
h
h ≤ 15m
CAUTION
• * : Assume equivalent piping 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.
• Piping length from outdoor branch to outdoor unit ≤ 10m, equivalent length : max 13m
(for 16HP or more)
33 Outdoor Unit
10m or
less
Branch pipe can not be used after header
* Equivalent pipe length
A+f ≤ 175m
indoor unit)
indoor unit)
Refrigerant piping installation
L150m
L150m
40m
WARNING
Pipe lengths after header branch-
ing (a~f)
It is recommended that difference
in lengths of the pipes connected
to the indoor units is minimized.
Performance difference between
indoor units may occur.
Installation Manual 33
40m