LG ARWN Serie Manual De Instalación página 36

Refrigerant piping system
• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe
diameter (B) after 1st branching that is the same as the main pipe diameter (A). Ex) When connecting with 120% of the indoor unit to
10 HP.
1) Outside unit main pipe diameter: Ø22.2(7/8) (Gas pipe) /Ø 9.52(3/8) (Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : Ø28.58(1-1/8) (Gas pipe) / Ø12.7(1/2) (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8) (Liquid pipe) of main pipe diameter (A).
• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance con-
nected 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.)
40,48,50,60HP ............................................Ø41.3(1-5/8)
Indoor unit connection
' Indoor unit connecting pipe from branch (a~f)
Indoor unit capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
< 33(112,600)
36 Outside Unit
Gas Pipe
40,48,50,60HP ............................................Ø19.05(3/4) ' Ø22.2(7/8)
Liquid pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8)
Liquid Pipe
Gas pipe
Ø12.7(1/2)
Ø22.2(7/8)