LG ARUN50LR2 Installation Manual page 23

u Combination of Y branch/header method
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
Ú Refrigerant pipe diameter from branch to branch (B,C,D)
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤5.6(19,100)
<16(54,600)
<22.4(76,400)
< 33(112,600)
Ú Total pipe length = A+B+C+a+b+c+d+e ≤ 300m
Longest pipe length
L
A+B+b ≤ 150m
Longest pipe length after 1st branch
B+b ≤ 40m
Difference in height(Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50m(40m:Outdoor unit is lower than Indoor Units)**
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m
• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• ** : Indoor Unit should be installed at lower position than the header
Branch pipe can not be used after header
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4) Ø12.7(1/2)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8) Ø22.2(7/8)
* Equivalent pipe length
A+B+b ≤ 175m
Refrigerant piping installation
L150m
40m
Installation Manual 23