LG ARWN Serie Manual De Instalación página 31

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
h Connecting branch pipe between outside
units: ARRCN20(Ⓔ)
Ú Slave outside unit ~ Connecting
branch unit Ⓔ : Pipe diameter
between outside units (E)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø9.52(3/8)/12.7(1/2) Ø22.2(7/8)/28.58(1-1/8)
Ú Connecting branch pipe Ⓔ ~ Header branch part Ⓑ : Main pipe diameter (A)
Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
24,30HP Ø19.05(3/4)
32,40HP Ø19.05(3/4)
Ú Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 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)
High/Low difference (Outside unit ÷ Outside unit)
h1
h1 ≤ 2m(6.6ft)
• 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(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.)
24,30HP..................................................................Ø37.9 ' Ø38.1(1-1/2)
32,40HP............................................................Ø41.3(1-5/8)
Low/high pressure
common pipe
Ø19.05(3/4)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Gas Pipe
Slave
Master
Below 2m(6.6ft)
Below 10m
Below 15m(49ft)
Liquid Pipe
24,30,32,40HP........................................................Ø19.05(3/4) ' Ø22.2(7/8)
Refrigerant piping system
L Below 150m(492ft)
l Below 40m(131ft)
Installation Manual 31