LG MULTI V ARWN80LA2 Product Data page 135

7.2.2 When installing 2 outside units
Ex) 6 indoor units connected
: Outside unit
: Header branch
: Indoor unit
: Seal
: Connecting branch pipe between out-
side units
Connecting branch pipe between outside
units: ARCNN20( )
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
Connecting branch pipe
Outside unit capacity Liquid pipe (mm)
24, 26, 28, 30 HP Ø19.05
40 HP Ø19.05
Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 300 m
Longest pipe length (Equivalent pipe length)
L
A +f ≤ 150 m(175 m)
Longest pipe length after 1st branching
f ≤ 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
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 .........................Ø34.9
40 HP ...........................................Ø41.3
23
23
Low/high pressure
common pipe
Ø19.05
~ Header branch part
Gas pipe (mm)
Ø34.9
Ø41.3
Indoor unit)
Indoor unit)
Outside unit)
Gas Pipe
Ø38.1
Slave
Master
Below 2m
Below 10m
Below 15 m
: Main pipe diameter (A)
24, 26, 28, 30 HP......................... Ø19.05
40 HP........................................... Ø19.05
L Below 150 m
l Below 40 m
Liquid Pipe
Ø22.2
Ø22.2
Installation