LG ARWN Series, Installation Manual

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Refrigerant piping system
Master
Slave
L Below 150 m
Belo
w H 50 m
Below 40 m
Below 15 m
Below 10m
Below 2m
Ú
Slave outside unit ~ Connecting
branch unit
Ⓔ
: Pipe diameter
between outside units (E)
Ú
Connecting branch pipe
Ⓔ
~ Header branch part
Ⓑ
: Main pipe diameter (A)
2. When installing 2 outside units
Ex) 6 indoor units connected
Ⓐ
: Outside unit
Ⓑ
: Header branch
Ⓒ
: Indoor unit
Ⓓ
: Seal
Ⓔ
: Connecting branch pipe between out-
side units
h
Connecting branch pipe between outside
units: ARRCN20(
Ⓔ
)
Outside unit capacity Liquid pipe (mm) Gas pipe (mm)
24 HP Ø19.05 Ø34.9
32 HP Ø19.05 Ø41.3
• 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.)
Liquid pipe (mm) Gas pipe (mm)
Low/high pressure
common pipe(mm)
Ø9.52/12.7 Ø22.2/28.58 Ø19.05
Ú
Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 300 m
Longest pipe length (Equivalent pipe length)
A +f ≤ 150 m(175 m)
Longest pipe length after 1st branching
f ≤ 40 m
High/Low difference (Outside unit
÷
Indoor unit)
H ≤ 50 m
High/Low difference (Indoor unit
÷
Indoor unit)
h ≤ 15 m
High/Low difference (Indoor unit
÷
Indoor unit)
h1 ≤ 2 m
L
ℓ
H
h
h1
Gas Pipe Liquid Pipe
24 HP ...........................................Ø34.9
’
Ø38.1 24, 32 HP .....................................Ø19.05
’
Ø22.2
32 HP ...........................................Ø41.3
30 Outside Unit