LG MULTI V Installation Manual page 38

Pipe connections between indoor and outdoor unit
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 ≤ 3280.8ft(1000m)
Longest pipe length
L
A+B+b ≤ 492ft(656ft(200m)**)
Longest pipe length after 1st branch
B+b ≤ 131ft(40m)(295ft(90m)**)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H
H ≤ 361ft(110m)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 49ft(15m)
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 16ft(5m)
• * : Assume equivalent pipe length of Y branch to be 1.6ft(0.5m), that of header to be 3.3ft(1m), calculation purpose
• It is recommended that indoor unit is installed at lower position than the header.
WARNING
If overall equivalent pipe length is greater than or equal to 295ft(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.
38 Outdoor Unit
Liquid pipe
[inch(mm)
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 ≤ 574ft(738ft(225m)**)
Standard Pipe Diameter
Liquid pipe Gas pipe
[mm (inch)] [mm (inch)]
19.05(3/4)
9.52(3/8)
22.2(7/8)
12.7(1/2)
28.58(1 1/8)
15.88(5/8)
34.9(1 3/8)
19.05(3/4)
41.3(1 5/8)
44.5(1 3/4)
22.2(7/8)
53.98(2)
Gas pipe
[inch(mm)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
1
Ø28.58(1 / )
8
1
Ø28.58(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)]
12.7(1/2)
15.88(5/8)
19.05(3/4)
22.2(7/8)
25.4(1)
Gas pipe
[mm (inch)]
22.2(7/8)
25.4(1)
28.58(1 1/8)
31.8(1 1/4)
34.9(1 3/8)
38.1(1 1/2)
41.3(1 5/8)
53.98(2)