System Engineering
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SYSTEM ENGINEERING
Due to our policy of continuous product innovation, some specifications may change without notification.
© LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Figure 34: Multi V Mini Pipe Configuration Limitations
Table 22: Multi V Mini Liquid-Line Pipe-Design Parameters
Pipe Length*
Total System 984 ELF
Longest distance
from ODU to IDU
492 feet (Actual)
574 feet (Equivalent)
Distance between
fi ttings and IDUs
≥ 20” ELF
Minimum distance between IDU to
any Y-Branch
≤ 131 ELF
Maximum distance between fi rst
Y-Branch to farthest IDU
131 feet
Minimum distance from IDU to
Y-Branch
3 feet
Elevation
If ODU is above IDU 164 feet
If ODU is below IDU 131 feet
Between any two IDUs 49 feet
b. If the outdoor unit is mounted above the indoor unit(s)
a. If the outdoor unit is mounted below the indoor unit(s)
Liquid Line Pipe Design Parameters
Device Connection Limitations
• Minimum number of connected indoor units per system = 1.
• Minimum number of operating indoor units per system = 1.
• Maximum number of indoor units on a system is:
ARUN036 = 6
ARUN047 = 8
ARUN053 = 9
PIPE DESIGN PARAMETERS
IDU = Indoor Unit
ODU = Outdoor Unit
All elevation limitations are measured in actual feet
ELF = Equivalent length of pipe in feet
* Limitations refer to the liquid line length (not the sum of the liquid and vapor)
Table 23: Field-Supplied Refrigerant Fittings—Liquid Line Equivalent Pipe Length
Copper Tubing Size (OD)
Equivalent Pipe Length
*
3/8 1/2 5/8 3/4 7/8 1-1/8
Standard 90
O
Elbow
0.6 0.9 1.3 1.6 1.9 2.5
Long Radius 90
O
Elbow
0.4 0.6 0.8 1.0 1.3 1.7
Street 90
O
Elbow
1.0 1.6 2.1 2.6 3.1 4.2
Standard 45
O
Elbow
0.3 0.5 0.7 0.8 1.0 1.3
Street 45
O
Elbow
0.5 0.8 1.1 1.4 1.6 2.2
Y-Branch
1.6 1.6 1.6 1.6 1.6 1.6
Header
3.3 3.3 3.3 3.3 3.3 3.3
Ball Valve
The equivalent length of a FULL port ball valve is the physical length of the valve. Ignore the valves and treat as straight pipe. A full port ball has the same bore
diameter as the connected pipe.
* Equivalent pipe length in feet—The sum of the actual pipe length plus allocations for pressure drop through elbows and valves located in the liquid line.
Values are calculated based on formula and factors from www.sporlanonline.com.
LG supplied Y-Branch and Header fittings must be used. Field-built Y-Branch and Header fittings are not permitted.
Total piping length cannot exceed 984 feet
Longest piping length after fi rst branch
Max 131 feet
Level difference between IDU’ and IDU’
Max 49 feet
Total piping length cannot exceed 984 feet
Level difference between
ODU’ and IDU’
Max 164 feet
Longest piping length
Max 492 feet (Actual)
Max 574 feet (Equivalent)
Outdoor Unit
Longest piping length
Max 492 feet (Actual)
Max 574 feet (Equivalent)
Level difference between IDU’ and IDU’
Max 49 feet
Actual pipe length—Actual physical length of a pipe
Outdoor Unit
Longest piping length after fi rst branch
Max 131 feet
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