LG multi V ARUN Series Installation Manual page 37

Ú Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
≤ 22.4(76,400)
< 33.6(114,700)
< 50.4(172,000)
< 67.2(229,400)
< 72.8(248,500)
< 100.8(344,000)
< 173.6(592,500)
< 184.8(630,700)
< 224.0(764,400)
Ú Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m
Longest pipe length
L
A+B+b ≤ 150m(200m**)
Longest pipe length after 1st branch
l
B+b ≤ 40m(90m**)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H
H ≤ 110m
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 5m
• * : 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.
WARNING
It is recommended that difference of piping length for pipes connected to the Indoor Unit is
minimized. Performance difference between Indoor Units may occur.
WARNING
If overall equivalent pipe length is more than 90m from ODU to the longest IDU,
The diameter of the main pipe (Gas and Liquid pipes) must be increased as follow.
Ú Refrigerant pipe diameter from outdoor unit to first branch. (A)
Outdoor unit
Total capacity
[kW (Btu/h)
16.0~22.4(54,600~76,400)
28.0(95,900)
33.6~44.8(172,000~152,900)
50.4~61.6(172,000~210,600)
67.2(229,400)
72.8~95.2(248,500~324,900)
100.8~168.0(344,000~573,300)
173.6~179.2(592,500~611,600)
184.8~224.0(630,700~764,400)
h If available on site, it use this size. Otherwise it can't be increased.
Pipe connections between indoor and outdoor unit
Liquid pipe
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Ø22.2(7/8)
Ø22.2(7/8)
* Equivalent pipe length
A+B+b ≤ 175m(225m**)
Standard Pipe Diameter
Liquid pipe Gas pipe
[mm (inch)] [mm (inch)]
Φ19.05(3/4)
Φ9.52(3/8)
Φ22.2(7/8)
Φ12.7(1/2)
Φ28.58(1 1/8)
Φ15.88(5/8)
Φ34.9(1 3/8)
Φ19.05(3/4)
Φ41.3(1 5/8)
Φ44.5(1 3/4)
Φ22.2(7/8)
Φ53.98(2)
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1 )
1/8
Ø28.58(1 )
1/8
Ø34.9(1 )
3/8
Ø34.9(1 )
3/8
Ø41.3(1 )
5/8
Ø44.5(1 )
3/4
Ø53.98(2)
Conditional application
(more than 90m from ODU to IDU)
Liquid pipe
[mm (inch)]
Φ12.7(1/2)
Φ15.88(5/8) Φ28.58(1 1/8)
Φ31.8(1 1/4)
Φ19.05(3/4)
Φ34.9(1 3/8)
Φ38.1(1 1/2)
Φ22.2(7/8)
Φ41.3(1 5/8)
Φ25.4(1)
Installation Manual 37
Gas pipe
[mm (inch)]
Φ22.2(7/8)
Φ25.4(1)
Φ53.98(2)