Refrigerant Piping System - LG MULTI V ARWN80LA2 Product Data

7. Refrigerant piping system

7.1 Y branch method
7.1.1 When installing 1 outside unit
independently
Ex) 5 indoor units connected
: Outside unit
: 1st branch (Y branch)
: Indoor units
: Indoor unit direction
Outside unit ~ 1st branch
Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
8 HP Ø9.52
10 HP Ø9.52
16,18, 20 HP Ø12.7
Refrigerant pipe diameter from
branch to branch (B,C,D)
Total capacity of indoor units con-
nected to after branching (kW)
≤ 5.6
< 16
≤ 22.4
< 33
< 47
< 71
< 104
104 ≤
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
• 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).
• 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
8 HP .............................................Ø19.05
10 HP ...........................................Ø22.2
16, 18, 20 HP ..............................Ø28.58 Ø31.8
19
19
:
Gas pipe (mm)
Ø19.05
Ø22.2
Ø28.58
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
Ø19.05 Ø34.9
Ø19.05 Ø41.3
Ø22.2 8 HP.............................................Ø9.52
Ø25.4 10 HP...........................................Ø9.52
16, 18, 20 HP ..............................Ø12.7
L Below 150 m
l Below 40 m
Below 15 m
Total pipe length =
A+B+C+D+a+b+c+d+e ≤ 300m
Longest pipe length (Equivalent pipe length)
L
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
H
H 50 m
High/Low difference (Indoor unit
h
h 15 m
Liquid Pipe
Indoor unit
direction
Indoor unit)
Indoor unit)
Ø12.7
Ø12.7
Ø15.88
Installation