LG MULTI V ARWN80LA2 Product Data page 133

7.1.3 When installing 3 outside units
Ex) 5 Indoor Units connected
: Outside Unit
: 1st branch (Y branch)
: Indoor Units
: Downward Indoor Unit
: Connection branch pipe between
Outside units:ARCNN30
: Connection branch pipe between
Outside units:ARCNN20
Slave2 outside unit ~ Connecting
branch pipe : Pipe diameter
between outside units (F)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7 Ø22.2/28.58
Slave1 outside unit ~ Connecting
branch pipe : Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø15.88/19.05 Ø34.9/41.3
Total refrigerant pipe length =
A + B + C + D + a + b + c + d + e ≤ 300 m
Longest pipe length (Equivalent pipe length)
L
A + B + C + D + e 150 m(175 m)
Longest pipe length after 1st branching
B + C + D + e 40 m
High/Low difference (Outside unit
H
H 50 m
High/Low difference (Indoor unit
h
h 15 m
High/Low difference (Outside unit
h1
h 2 m
• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)
after 1st branching that is the same as the main pipe diameter (A).
Ex) When connecting with 120% of the indoor unit to 10 HP.
1) Outside unit main pipe diameter: 22.2 (Gas pipe) / 9.52(Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : 28.58 (Gas pipe) / 12.7 (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to 22.2 (Gas pipe) / 9.52 (Liquid pipe) of main pipe diameter (A).
• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the main pipe diame-
ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)
Gas Pipe
50, 60HP ......................................Ø41.3
21
21
10m or
less
Low/high pressure
common pipe
Ø19.05
Low/high pressure
common pipe
Ø19.05
Indoor unit)
Indoor unit)
Outside unit)
50, 60HP......................................Ø19.05
Slave2
Slave1
Master
Below 2m
(h1)
Connecting branch pipe
branch part : Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
50, 60HP
Refrigerant pipe diameter from branch
to branch (B, C, D)
Total capacity of indoor
Liquid pipe
units connected to after
branching (kW)
≤ 5.6
< 16
≤ 22.4
< 33
< 47
< 71 Ø15.88
< 104 Ø19.05
104 ≤
Ø19.05
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
Liquid Pipe
Indoor unit
direction
L150m
l 40m
~ 1st
Gas pipe (mm)
Ø19.05 Ø41.3
Gas pipe
(mm) (mm)
Ø6.35 Ø12.7
Ø9.52 Ø15.88
Ø9.52 Ø19.05
Ø9.52 Ø22.2
Ø12.7 Ø28.58
Ø28.58
Ø34.9
Ø41.3
Ø22.2
Installation