LG ARND DCR4 Series Installation Manual page 23

REFRIGERANT PIPING SYSTEM INSTALLATION
Table 11: DOAS Unit Connecting Pipe from Y-Branch. Connecting Pipe from Y-Branch to DOAS Unit.
Model No. Liquid Pipe O.D.
ARND153DCR4
ARND203DCR4
Table 12: Multi V 5 Heat Recovery System Piping Length Parameters with DOAS Units Installed.
Length
L
Elevation 1
Elevation 2
Height 1
Distance between Outdoor Unit to
Outdoor Unit
Distance between Fittings and
DOAS Units
Distance between Fittings and
Y-branches
Distance between two Y-branches
Table 13: Equivalent Piping Length for Y-branches and Other Piping Components.
Component
Long Radius Elbow (ft.)
Y-branch (ft.)
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 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.
•
feet.
DOAS Layout Example / Selecting the Piping Size
Low Pressure Pipe O.D. High Pressure Pipe O.D.
1/2 1-1/8
1/2 1-1/8
Total Pipe Length
1/4 3/8
0.5 0.6
Due to our policy of continuous product innovation, some specifications may change without notification.
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3/4
7/8
Longest Actual Pipe Length
*656 feet (200m) Conditional
Applications
Longest Pipe Length after First Branch
Maximum 295 feet (90m) Conditional Applications
1
Size (Inches)
1/2 5/8 3/4 7/8 1
0.7 0.8 1.2 1.3 1.5
Equivalent Pipe Length
*738 feet (225m) Conditional
Applications
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
1.6 1.8 2.0 2.1 2.3
1.6
1
2.5 2.8
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