LG ARWN160BA2 Installation Manual page 27

2. When installing 2 outside units
Ex) 5 indoor units connected
Ⓐ : Outside units
Ⓑ : 1st branch
Ⓒ : Indoor units
Ⓓ : Indoor unit direction
Ⓔ : Connecting branch pipe between out-
side units
h Connecting branch pipe between outside
units: ARRCN20(ⓔ)
Ú Slave outside unit ~ Connecting
branch pipe Ⓔ: Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7 Ø22.2/28.58
Ú Connecting branch pipe Ⓔ ~ 1st
branch part Ⓑ: Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
24 HP Ø19.05
32 HP Ø19.05
Ú Refrigerant pipe diameter from branch
to branch (B, C, D)
Total capacity of indoor
Liquid pipe
units connected to after
(mm)
branching (kW)
≤ 5.6 Ø6.35
< 16 Ø9.52
< 22.4 Ø9.52
< 33 Ø9.52
< 47 Ø12.7
< 71 Ø15.88
< 104 Ø19.05
104 ≤ Ø19.05
• 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 150% of the indoor unit to 8 HP.
1) Outside unit main pipe diameter: 22.2 (Gas pipe) / 9.52(Liquid pipe)
2) Pipe diameter after 1st branching by 150% 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
diameter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)
24 HP ...........................................Ø34.9 ' Ø38.1
32 HP ...........................................Ø41.3
Low/high pressure
common pipe(mm)
Ø19.05
Gas pipe (mm)
Ø34.9
Ø41.3
Gas pipe
(mm)
Ø12.7
Ø15.88
Ø19.05
Ø22.2
Ø28.58
Ø28.58
For the first branch pipe (B), use the branch pipe
Ø34.9
that fits the main pipe diameter (A).
Ø41.3
Gas Pipe
Slave
Master
Below 2m
Below 10m
Below 15 m
Ú 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
ℓ
B + C + D + e ≤ 40 m
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50 m
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15 m
High/Low difference (Indoor unit ÷ Indoor unit)
h1
h ≤ 2 m
Liquid Pipe
24, 32 HP.....................................Ø19.05 ' Ø22.2
Refrigerant piping system
Indoor unit
direction
L Below 150 m
Below 40 m
Installation Manual 27