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27
General Refrigerant Piping System Information
Due to our policy of continuous product innovation, some specications may change without notication.
© LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Selecting Field-Supplied Copper Piping
Always follow local codes when selecting and installing copper pipe and piping system components.
Approved piping for use with LG Single Zone products will be marked “R410 RATED” along the length of the pipe. Piping wall thickness must
meet local code requirements and be approved for a maximum operating pressure of 551 psi. When bending piping, try to keep the number
of bends to a minimum, and use the largest radii possible to reduce the equivalent length of installed piping; also, bending radii greater than
ten (10) piping diameters can minimize pressure drop. Be sure no traps or sags are present.
For Single Zone Systems
LG prefers the use of ACR copper piping rated at the system working pressure was used.
Always properly support the piping as per the instructions in the “Pipe Supports” section.
Table 11: Piping Tube Thicknesses.
Type Seamless Phosphorous Deoxidized
Class UNS C12200 DHP
Straight Lengths H58 Temper
Coils O60 Temper
Table 12: ACR Rated Copper Tubing Material.
OD (in) 1/4 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8
Material Rigid or Soft ACR Rated for R410A Rigid or Solid ACR Rated for R410A
Min. Bend Radius (in) 0.563 0.9375 1.5 2.25 3.0 3.0 3.5 4.0 4.5
Min. Wall Thickness (in) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.050
Table 13: ACR Copper Tubing Dimensions and Physical Characteristics
1-3
.
Nominal Pipe
Outside
Diameter (in)
Actual Outside
Diameter (in)
Drawn Temper Annealed Temper
Nominal Wall
Thickness (in)
Weight (lb/ft)
Cubic ft per
Linear ft
Nominal Wall
Thickness (in)
Weight (lb/ft)
Cubic ft per
Linear ft
1/4 0.250 -- -- -- 0.030 0.081 0.00020
3/8 0.375 0.030 0.126 0.00054 0.032 0.134 0.00053
1/2 0.500 0.035 0.198 0.00101 0.032 0.182 0.00103
5/8 0.625 0.040 0.285 0.00162 0.035 0.251 0.00168
3/4 0.750 0.042 0.362 0.00242 0.042 0.362 0.00242
7/8 0.875 0.045 0.455 0.00336 0.045 0.455 0.00336
1-1/8 1.125 0.050 0.655 0.00573 0.050 0.655 0.00573
1
All dimensions provided are in accordance with ASTM B280 – Standard..
2
Design pressure = 551 psig.
3
The Copper Tube Handbook, 2010, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.
• Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.
• Prevent dust, water or other contaminants from entering the piping during installation.
SELECTING FIELD SUPPLIED PIPING
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