LG ARWN Series, Installation Manual

Page: 26 / 75

Refrigerant piping system
Refrigerant piping system
Y branch method
Ú
Refrigerant pipe diameter from
branch to branch (B,C,D)
Ú
Total pipe length =
A+B+C+D+a+b+c+d+e ≤ 300m
Ú
Outside unit
Ⓐ
~ 1st branch
Ⓑ
:
Main pipe diameter (A)
L Below 150 m
Belo
w H 50 m
l Below 40 m
Below 15 m
Indoor unit
direction
• 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 150% of the indoor unit to 8 HP
1) Outside unit main pipe diameter: 22.2 (Gas pipe) / 9.52(Liquid pipe)
2) Pipe diameter after 1st branching by 150% 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).
• 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.)
Total capacity of indoor units con-
nected to after branching (kW)
≤ 5.6 Ø6.35 Ø12.7
< 16 Ø9.52 Ø15.88
< 22.4 Ø9.52 Ø19.05
< 33 Ø9.52 Ø22.2
< 47 Ø12.7 Ø28.58
< 71 Ø15.88 Ø28.58
< 104 Ø19.05 Ø34.9
104 ≤ Ø19.05 Ø41.3
Liquid pipe
(mm)
Gas pipe
(mm)
1. When installing 1 outside unit
independently
Ex) 5 indoor units connected
Ⓐ
: Outside unit
Ⓑ
: 1st branch (Y branch)
Ⓒ
: Indoor units
Ⓓ
: Indoor unit
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
Longest pipe length (Equivalent pipe length)
A + B + C + D + e ≤ 150 m(175 m)
Longest pipe length after 1st branching
B + C + D + e ≤ 40 m
High/Low difference (Outside unit
÷
Indoor unit)
H ≤ 50 m
High/Low difference (Indoor unit
÷
Indoor unit)
h ≤ 15 m
L
ℓ
H
h
Gas Pipe Liquid Pipe
8 HP .............................................Ø22.2
’
Ø25.4 8 HP .............................................Ø9.52
’
Ø12.7
16 HP ...........................................Ø28.58
’
Ø31.8 16 HP ...........................................Ø12.7
’
Ø15.88
Outside unit capacity Liquid pipe (mm) Gas pipe (mm)
8HP Ø9.52 Ø22.2
16 HP Ø12.7 Ø28.58
26 Outside Unit