LG MULTI V ARNU363DDA4 Installation Manual page 32

REFRIGERANT PIPING
Refrigerant Pipe Length Limits
Proper system operation depends on the installer using utmost care while assembling the piping system. The following pages are an over-
view of best practices when installing the refrigerant piping system.
One of the most critical elements of a Multi V system is the refrigerant piping. The table below lists pipe length limits that must be followed in
the design of a Multi V refrigerant pipe system:
Table 7: Multi V Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
Table 8: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.
Component
Long Radius Elbow (ft.)
Y-branch (ft.)
1
Kit contains two Y-branches: one for liquid and one for vapor.
1
Selection of Pipe Sizes
For piping work, follow the maximum tolerated length, difference in height, and length after a branch. Determine the proper size referring to
following tables and reference figure (only for indication)
Table 6: Piping Outer Diameter (O.D.) size.
ODU Capacity
Liquid pipe (O.D.) Low Pressure pipe (O.D.)
Ton (kBtu/h)
10 (119.7)
1/2 in
12 (144)
14 (168)
5/8 in
16-18 (192-206)
20 (233.1)
22-28 (264-336)
3/8 in
30-42 (360-504)
32
Longest total equivalent piping length
Longest distance from outdoor unit to RTU
Distance between fittings and RTU
Distance between fittings and Y-branches
Distance between two Y-branches
Minimum distance between RTU to any Y-branch
Maximum distance between first Y-branch to farthest RTU
If outdoor unit is above or below RTU
Between RTUs
1/4 3/8 1/2 5/8
0.5 0.6 0.7 0.8
1-1/8 in
1-3/8 in
1-3/8 in
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.
Size (Inches)
3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8
1.2 1.3 1.5 1.6 1.8
High Pressure pipe (O.D.)
3/4 in
7/8 in
1-1/8 in
3,280 feet
656 feet (Actual) 738 feet (Equivalent)
≥20 inches
≥20 inches
≥20 inches
3 feet from RTU to Y-branch
131 feet (295 feet for conditional applications)
164 feet
98 feet
1-3/4
2.0 2.1 2.3 2.5
2-1/8
2.8