LG MULTI V WATER IV ARWV100DAL4 Installation Manual page 25

u Cautions for Y branch pipe
WARNING
If the pipe diameter(B, C) connected after the 1st branch is larger than the main pipe diameter(A), install the
pipe diameter(B, C) connected after the 1st branch to be the same as the main pipe diameter(A).
Example) If indoor units are connected 120 % to 29 kW
• Outdoor unit main pipe diameter(A): (Gas pipe) (Fluid pipe)
• Pipe diameter(B, C) after the 1st branch according to 120% indoor unit combination(34.8kW):
(Gas pipe) (Fluid pipe)
Therefore, select the pipe diameter(B, C) after the 1st branch to be main pipe diameter(A) (Gas pipe) (Fluid pipe)
u Cautions for header branch pipe
WARNING
• It is recommended to install the difference between the length of the pipe after header branch(a~f) and the
length of the pipe connected to indoor unit to be the minimum.
• As the pipe length difference increases, there may be performance differences between indoor units.
• Y branch and header branch cannot be used after header branch.
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)
Oil trap application method between outside units
• Because of the possibility of oil being accumulated in the outside unit that has stopped, when there is a height difference be-
tween outside unit pipes or if the pipe distance between the outside units is over 2m, you must always apply an oil trap. (But,
the oil trap between outside units is limited to 1 time and is only applied to the gas pipe.)
• If the pipe distance between the outside units is 2m or below, and if the location of the main pipe is lower than that of the out-
side unit and if the location of the main pipe is lower than that of the outside unit, the oil trap does not have to be applied.
• If the location of the main pipe is higher than the location of the outside unit, be careful since the oil can be accumulated in the
stopped outside unit.
• If there is high/low difference between the outside unit pipes, oil can be accumulated to the outside unit on the lower location
until the unit stops.
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4) Ø12.7(1/2)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8) Ø22.2(7/8)
Refrigerant piping system
Installation Manual 25