LG MULTI V IV PRO ARUV100LLS4 Installation Manual page 35

(Table 4) Conditional Application
• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
Condition
Diameter of pipes between
first branch and the last branch
should be increased by one
1
step, except pipe diameter
B,C,D is same as Diameter A
While calculating whole refriger-
ant pipe length, pipe B,C,D
2
length should be calculated
twice.
Length of pipe from each indoor
unit to the closest branch
3
Length of pipe from outdoor
unit to the farthest indoor unit 5
(A+B+C+D+e)] - [Length of
4
pipe outdoor unit to the closest
indoor unit 1 (A+a)] ≤ 40 m
WARNING
!
• In case of pipe diameter B connected after first branch is bigger than the main pipe diame-
ter A, B should be of the same size with A.
Ex) In case indoor unit combination ratio 120% is connected to 24 HP(67.2 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø 34.9(Gas pipe), Ø 15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor unit ombination(80.6 kW) :
Ø 34.9(gas pipe), Ø 19.05(liquid pipe)
Therefore, pipe diameter B connected after first branch would be Ø 34.9(gas pipe) /
Ø 15.88(liquid pipe) which is same with main pipe diameter.
WARNING
!
Pipe length after header branching (a~e)
It is recommended that difference in length of the pipes connected to the Indoor Units is
minimized. Performance difference between Indoor Units may occur.
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
40 m < B+C+D+e
90 m ' B, C, D
Change a diameter
A+Bx2+Cx2+Dx2
+a+b+c+d+e ≤
1 000 m
a,b,c,d,e ≤ 40 m
(A+B+C+D+e)-(A+a) ≤
40 m
Example
Ø6.35 ' Ø9.52, Ø9.52 ' Ø12.7,
Ø12.7 ' Ø15.88, Ø15.88 ' Ø19.05,
Ø19.05 ' Ø22.2, Ø22.2 ' Ø25.4,
Ø25.4 ' Ø28.58, Ø28.58 ' Ø31.8,
Ø31.8 ' Ø34.9, Ø34.9 ' Ø38.1
L
l
h 30m
35
Indoor
Unit