Sample Layout; Conditional Applications - LG ARND DCR4 Series Installation Manual

Sample Layout

Images are for illustrative purposes only and are not accurate represen-
system rules, review the information in this entire piping section, see the
LG Multi V 5 LGRED Engineering Manual, and follow the LATS diagram.
Example: Triple-Frame Multi V 5 with Three (3) Split
Compact DOAS Units Connected
ODU: Outdoor Units.
DOAS: DOAS Units
A: Main Pipe from Outdoor Unit to First Y-branch.
B: Y-Branches to DOAS Units or Y-Branch to Y-Branch.
Table 21: Connecting Pipe from DOAS Unit to Y-Branch.
Liquid Pipe
Model No.
O.D.
ARND093DCR4 3/8
ARND153DCR4 1/2
ARND203DCR4 1/2
Table 22: Main Pipe (A) Diameter from Outdoor Unit to First Y-Branch.
ODU
Capacity
Liquid Pipe
(ton)
(Inches O.D.)
10 1/2Ø
12 1/2Ø
14 5/8Ø
16-18 5/8Ø
20 5/8Ø
22-28 3/4Ø
30-42 3/4Ø
Table 23: Refrigerant Pipe (B) Diameters Between Y-Branches, and Y-Branches / DOAS Unit.
Downstream DOAS Capacity (Btu/h)

Conditional Applications

Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.
If the equivalent length between the first Y-branch to the farthest DOAS unit is >131 feet (maximum 295 feet):
• Pipe segment diameters between the first branch and the last branch must be sized up by one. This applies to both the liquid and low / high
pressure vapor pipes. If the next size up is not available, or if the pipe segment diameters are the same as main pipe (A) diameters, sizing
up is not possible.
• While calculating total refrigerant piping length, pipe (B) segment lengths between the first Y-branch and second Y-branch, and between the
second Y-branch and the DOAS unit must be calculated by two.
•
Low Pressure High Pressure
Pipe O.D. Pipe O.D.
3/4 5/8
1-1/8 3/4
1-1/8 7/8
Standard Pipe Diameter
Low Pressure Vapor High Pressure Vapor
Pipe (Inches O.D.) Pipe (Inches O.D.)
1-1/8Ø
1-1/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
1-3/8Ø
1-5/8Ø
Liquid Pipe O.D.
1/2 in.
5/8 in.
5/8 in.
3/4 in.
3/4 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.
Sample Layout / Conditional Applications
Figure 23: Pipe Sizing / Layout Example.
Pipe Diameter when Pipe Length is 295 feet [90m],
Liquid Pipe
(Inches O.D.)
3/4Ø 5/8Ø
7/8Ø 5/8Ø
7/8Ø 3/4Ø
1-1/8Ø 3/4Ø
1-1/8Ø 3/4Ø
1-1/8Ø 7/8Ø
1-1/8Ø 7/8Ø
Low Pressure Vapor Pipe O.D. High Pressure Vapor Pipe O.D.
1-1/8 in.
1-1/8 in.
1-3/8 in.
1-3/8 in.
1-5/8 in.
UNIT PIPING
or When Height Differential
Low Pressure Vapor High Pressure Vapor
Pipe (Inches O.D.) Pipe (Inches O.D.)
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
7/8 in.
7/8 in.
1-1/8 in.
1-1/8 in.
1-3/8 in.
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
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