LG MULTI V WATER II ARWN Series Installation Manual page 32

Refrigerant piping system
2. When installing 2 outside units
Ex) 6 indoor units connected
Ⓐ : Outside units
Ⓑ : Header branch
Ⓒ : Indoor unit
Ⓓ : Seal
Ⓔ : Connecting branch pipe between out-
side units
h Connecting branch pipe between outside
units: ARRCN20(Ⓔ)
Ú Slave outside unit ~ Connecting
branch unit Ⓔ : Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7 Ø22.2/28.58
Ú Connecting branch pipe Ⓔ ~ Header branch part Ⓑ : Main pipe diameter (A)
Outside unit capacity
24, 26, 28, 30 HP
32, 34, 36, 38, 40 HP
Ú Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 300m (500m**)
Longest pipe length (Equivalent pipe length)
L
A +f ≤ 150 m(175 m)
Longest pipe length after 1st branching
ℓ
f ≤ 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
h1 ≤ 2 m
• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe dis-
tance connected to the indoor unit is minimized.
• The large difference in pipe distance can cause performance difference between indoor units.
• After the header branch, you cannot use the Y branch and header branch.
• 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, 26, 28, 30 HP............Ø 34.9 ' Ø 38.1
32, 34, 36, 38, 40 HP.........Ø 41.3
32 Outside Unit
Low/high pressure
common pipe(mm)
Ø19.05
Liquid pipe (mm) Gas pipe (mm)
Ø 19.05 Ø 34.9
Ø 19.05 Ø 41.3
Gas pipe (mm)
Slave
Master
Below 2m
Below 10m
Below 15 m
Liquid pipe (mm)
24, 26, 28, 30, 32, 34, 36, 38, 40 HP
............Ø 19.05 ' Ø 22.2
L Below 150 m
Below 40 m