LG Multi V CRUN Series

Installation Manual 25
Refrigerant piping installation
ENGLISH
◆ Combination of Y branch/header method
CRUN458S0
Example : 5 indoor units
connected
: outdoor unit
: 1st branch
(branch union)
: Y branch
: indoor unit
: header
: sealing
: downward
indoor unit
➲ Piping diameter (A)
- Liquid pipe : Ø12.7mm(1/2 inch)
- Gas pipe : Ø19.05mm(3/4 inch)
➲ Refrigerant pipe diameter from branch to branch (B,C)
➲ Total pipe length = A+B+C+a+b+c+d+e ≤ 100m
A
L 70m
30m
l 30m
H
D
D
G
12m
h
d e
b
2
1
E
F
D D
4
D
35
X
c
C
B
C
A
a
B
Downward indoor unit total capacity
[kW(Btu/h)]
~3.8(13,000)
~8.2(28,000)
~15.0(51,000)
Ø6.35(1/4)
Ø9.52(3/8)
Ø12.7(1/2)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Longest pipe length
A+B+b ≤ 70m
Longest pipe length after 1st branch
B+b ≤ 30m
Difference in height(outdoor ↔ indoor)
H ≤ 30m ( 20m : outdoor is lower than indoor units)*
Difference in height (indoor ↔ indoor)
h ≤ 12m
L
l
H
h
* Indoor unit should be installed at lower position than the
header
Branch pipe can not be used
after header