LG MULTI V Installation Manual page 35

3 Outdoor Units
Example : 6 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
Ú Total pipe length = A+a+b+c+d+e+f ≤ 3280.8ft(1000m)
Longest pipe length
L
A+f ≤ 656ft(200m)
Longest pipe length after 1st branch
f ≤ 131ft(40m)
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 piping 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.
• Piping length from outdoor branch to outdoor unit ≤ 33ft(10m), equivalent length : max 43ft(13m)
(for 12ton(14HP) or more)
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 the step up size is not available, you can not select the next higher size available.
Pipe connections between indoor and outdoor unit
Slave2
Slave1
33ft
(10m)
or less
Branch pipe can not be used after header
* Equivalent pipe length
A+f ≤ 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)
Master
ODU Capacity
Master ≥ Slave1 ≥ Slave2
L 656ft(200m)
49ft(15m)
WARNING
Pipe length after header branching
(a~f)
It is recommended that difference in
length of the pipes connected to the
Indoor Units is minimized.
Performance difference between
Indoor Units may occur.
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)
Installation Manual 35
131ft(40m)
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)