LG ARWN160BA2 Installation Manual page 31

3. When installing 3 outside units
Ex) 6 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe between
Outside units:ARCNN30
Ⓕ : Connection branch pipe between
Outside units:ARCNN20
Ú Slave2 outside unit ~ Connecting
branch pipe Ⓕ: Pipe diameter
between outside units (F)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7 Ø22.2/28.58
Ú Slave1 outside unit ~ Connecting
branch unit Ⓔ : Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø15.88/19.05 Ø34.9/41.3
Ú Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 300 m
Longest pipe length (Equivalent pipe length)
L
A +f ≤ 150 m(175 m)
Longest pipe length after 1st branching
ℓ
f ≤ 40 m
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50 m
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15 m
High/Low difference (Indoor unit ÷ Indoor unit)
h1
h1 ≤ 2 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 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 or above, you must change the main pipe diame-
ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)
Gas Pipe
40, 48HP ......................................Ø41.3
10m or
less
Branch pipe can not be used after header
Low/high pressure
common pipe(mm)
Ø19.05
Ú Connecting branch pipe Ⓔ ~ Header branch
Outside unit capacity
Low/high pressure
common pipe(mm)
Ø19.05
40, 48HP......................................Ø19.05 ' Ø22.2
Refrigerant piping system
Slave2
Slave1
Master
Below 2m Below 2m Below 2m
(h1) (h1) (h1)
part Ⓑ : Main pipe diameter (A)
Liquid pipe (mm)
40, 48HP Ø19.05
Liquid Pipe
L150m
40m
l
Gas pipe (mm)
Ø41.3
Installation Manual 31