LG MULTI V ARWN80LA2 Product Data page 134

7.2 Header branch method
7.2.1 When installing 1 outside unit inde-
pendently
Ex) 6 indoor units connected
Outside unit
Header branch
Indoor unit
Seal
Outside unit ~ Header branch
part : Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
8 HP Ø9.52
10 HP Ø9.52
16, 18, 20 HP Ø12.7
Total refrigerant pipe length = A +a +b +c +d +e +f ≤ 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
• 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.)
Gas Pipe
8 HP .............................................Ø19.05
10 HP ...........................................Ø22.2
16, 18, 20 HP ..............................Ø28.58 Ø31.8
Installation
Gas pipe (mm)
Ø19.05
Ø22.2
Ø28.58
Indoor unit)
Indoor unit)
Ø22.2 8 HP.............................................Ø9.52
Ø25.4 10 HP...........................................Ø9.52
16, 18, 20 HP ..............................Ø12.7
L Below 150 m
Below 15 m
Liquid Pipe
l Below 40 m
Ø12.7
Ø12.7
Ø15.88
22
22