LG MULTI V PLUS LRUV Series Installation Manual page 36

Refrigerant piping installation
2 Outdoor Units
Example : 6 Indoor Units connected
: Outdoor Unit
: Header branch
: Indoor Units
: Sealing
: Connection branch pipe
between Outdoor units:
ARBL202C
➲ Sub Outdoor Unit ~ Connection branch pipe
High/Low Pressure Common pipe
(mm)
Ø19.05(3/4 inch)
➲ Connection branch pipe
Liquid pipe
(mm)
Ø19.05(3/4 inch)
➲ Total piping length = A+a+b+c+d+e+f ≤ 220m
Longest piping length
*L
A+f ≤ 120m
Longest piping length after 1st branch
l
f ≤ 30m
Difference in height(Outdoor Unit ↔ Indoor Unit)
H
H ≤ 50m (40m : Outdoor Unit is lower)***
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 15m
*: Must be satisfied both conditions
Caution : ***:Indoor Unit should be installed at lower position than
the header.
**: Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
• Piping length from outdoor branch to outdoor unit ≤ 10m, equivalent lengh : max 13m
(for 16HP or more)
36 Outdoor Unit
Liquid pipe
Ø12.7(1/2 inch)
~ Main pipe diameter (A)
Gas pipe
(mm)
Ø38.1(1 1 / inch)
2
**Equivalent piping length
A+f ≤ 140m
10m or
less
Branch pipe can not be used after
header
Pipe diameter (E)
Gas pipe
(mm) (mm)
Ø28.58(1
Piping length after header branch-
ing (a~f)
It is recommended that difference
of the piping length connected to
the Indoor Unit is minimized.
Performance difference between
Indoor Units may occur.
1
/ inch)
8
WARNING