LG MULTI V WATER II ARWN Series Installation Manual page 35

2. When installing 2 outside units
Ex) 5 indoor units connected
Ⓐ : Outside units
Ⓑ : 1st Y branch
Ⓒ : 2nd Y branch
Ⓓ : Indoor unit
Ⓔ : Header branch
Ⓕ : Seal
Ⓖ : Connecting branch pipe between outside units
h Connecting branch pipe between outside units:
ARRCN20(Ⓖ)
Ú Slave outside unit ~ Connecting
branch pipe Ⓖ : Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7 Ø22.2/28.58
Ú Connecting branch pipe Ⓖ ~ 1st Y
branch part Ⓑ: Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
24, 26, 28, 30 HP
32, 34, 36, 38, 40 HP
Ú Refrigerant pipe diameter from branch
to branch (B, C)
Total capacity of indoor units
connected to after branching (kW)
≤ 5.6
< 16
< 22.4
< 33
< 47
< 71
< 104
104 ≤
• 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: 22.2 (Gas pipe) / 9.52 (Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : 28.58 (Gas pipe) / 12.7 (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to 22.2 (Gas pipe) / 9.52 (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 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 diameter according to the outside unit capacity in accordance with the following table. (This
applies to both the liquid and gas pipes.)
Gas pipe (mm)
24, 26, 28, 30 HP............Ø 34.9 ' Ø 38.1
32, 34, 36, 38, 40 HP.........Ø 41.3
Low/high pressure
common pipe(mm)
Ø19.05
Gas pipe (mm)
Φ19.05 Φ34.9
Φ19.05 Φ41.3
Liquid pipe Gas pipe
(mm) (mm)
Ø6.35 Ø12.7
Ø9.52 Ø15.88
Ø9.52 Ø19.05
Ø9.52 Ø22.2
Ø12.7 Ø28.58
Ø15.88 Ø28.58
For the first branch pipe (B), use the branch pipe
Ø19.05 Ø34.9
that fits the main pipe diameter (A).
Ø19.05 Ø41.3
Slave
Master
Below 2m
Below 10m
Ú Total refrigerant pipe length =
A + B + C + a + b + c + d + e ≤ 300m (500m**)
Longest pipe length (Equivalent pipe length)
L
A +B +b,A +C +e ≤ 150 m(175 m)
Longest pipe length after 1st branching
ℓ
B +b,C +e ≤ 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
h ≤ 2 m
Liquid pipe (mm)
24, 26, 28, 30, 32, 34, 36, 38, 40 HP
............Ø 19.05 ' Ø 22.2
Refrigerant piping system
L Below 150 m
l Below 40 m
Installation Manual 35