44
MULTI V 5 Outdoor Unit Installation Manual
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 Multi V products will be marked “R410 RATED” along the length of the pipe. Piping wall thickness should 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 Heat Recovery Systems
LG prefers the use of ACR hard drawn copper on pipe segments located between heat recovery units and outdoor units, between heat recov-
ery units piped in series, and between heat recovery units and multiple indoor units sharing an heat recovery unit port.
For Heat Pump Systems
LG prefers the use of ACR hard drawn copper for all pipe segments in the piping system except segments located between Y-branch fittings
(or header fittings) and indoor units.
For DOAS Units
LG prefers the use of hard drawn copper in pipe segments connecting a Dedicated Outdoor Air System (DOAS) product and an outdoor unit.
Always properly support the piping as per the instructions on page 50.
SELECTING COPPER PIPING
Table 20: ACR Rated Copper Tubing Material.
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.
Table 21: ACR Rated Piping Wall Thicknesses.
Type Seamless Phosphorous Deoxidized
Class UNS C12200 DHP
Straight Lengths H58 Temper
Coils O60 Temper
Table 22: ACR Copper Tubing Dimensions and Physical Characteristics
1-3
• Commercially available piping often contains dust and other materials. Always blow it clean with a dry nitrogen.
• Prevent dust, water or other contaminants from entering the piping during installation.
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
To Next Page
Loading...
