LG ARWN Serie Manual De Instalación página 30

Refrigerant piping system
Header branch method
1. When installing 1 outside unit indepen-
dently
Ex) 6 indoor units connected
Ⓐ Outside unit
Ⓑ Header branch
Ⓒ Indoor unit
Ⓓ Seal
Ú Outside unit Ⓐ ~ Header branch
part Ⓑ : Main pipe diameter (A)
Outside unit Liquid pipe
capacity [mm(inch)]
8 HP Ø9.52(3/8)
10 HP Ø9.52(3/8)
16 HP Ø12.7(1/2)
20 HP Ø12.7(1/2)
Ú Total refrigerant pipe length = A +a +b +c +d +e +f ≤ 300m(984ft)
Longest pipe length (Equivalent pipe length)
L
A +f ≤ 150m(492ft)( 175m(574ft))
Longest pipe length after 1st branching
ℓ
f ≤ 40m(131ft)
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50m(164ft)
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15m(49ft)
• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe
distance 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(295ft) 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.)
8, 10 HP.........................................................................Ø22.2(7/8) ' Ø25.4(1)
16, 20 HP.......................................................................Ø28.58(1-1/8) ' Ø31.8(1-1/4)
30 Outside Unit
Gas pipe
[mm(inch)]
Ø22.2(7/8)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Gas Pipe
Below 15m(49ft)
Liquid Pipe
8, 10 HP.........................................................................Ø9.52(3/8) ' Ø12.7(1/2)
16, 20 HP.......................................................................Ø12.7(1/2) ' Ø15.88(5/8)
L Below 150m(492ft)
l Below 40m(131ft)