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REFRIGERANT SYSTEM ENGINEERING
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.
LG Electronics U.S.A.,Inc., is not responsible for any piping calculations, refrigerant leaks, degradation of performance, any other potential problems
or damages caused by the interconnecting piping, their joint connections, isolation valves, or introduced debris inside the piping system.
No Pipe Size Substitutions
Use only the pipe size selected by the information in this manual. Using a different size is prohibited and will result in a system malfunction or
failure to work at all.
No In-line Refrigeration Components
Components such as oil traps, solenoid valves, filter-driers, sight glasses, tee fittings, and other after-market accessories are
permitted on the refrigerant piping system between the outdoor units and the indoor units. LG Single Zone systems are provided with
redundant systems that make sure oil is properly returned to the compressor. Sight-glasses and solenoid valves will cause vapor to form in
the liquid stream. Over time, driers will deteriorate and introduce debris into the system. The designer and installer must verify the refrigerant
piping system is free of traps, sagging pipes, sight glasses, filter driers, etc.
Field-Provided Isolation Ball Valves
LG maintains a neutral position on using isolation valves in LG HVAC refrigerant piping systems. LG does not endorse any manufacturer of
isolation valves. It is recognized that installing isolation valves will simplify future maintenance requirements, and, if used, considerations
must be taken including, but not limited to, the following:
• Pressure drops for any component used, including isolation valves, must be known in equivalent pipe length and calculated into the total
and segment equivalent piping lengths and compared to product design limitations.
• In all cases, materials must be suitable for the application and any applicable codes, including, but not limited to, diameter and wall thick-
ness continuity per ACR standards.
Failure to do so will cause significant performance degradation. Proper leak checks must be performed. Using isolation valves does not
automatically void any LG product warranty, however, a limited warranty will be voided in whole or part if any field supplied accessory fail in
any way that causes product failure.
Using Elbows
Field-supplied elbows are allowed if they are long radius and designed for
use with R410A refrigerant. The designer and installer, however, must be
cautious with the quantity and size of fittings used, and must account for
the additional pressure losses in equivalent pipe length calculation for each
branch. The equivalent pipe length of each elbow must be added to each
pipe segment manually (see table).
Pipe Bends
When bending soft copper, use long radius bends. Refer to the "Radii of Coiled Expansion Loops and Developed Lengths of Expansion
Offsets" table for minimum radius specifications.
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Due to our policy of continuous product innovation, some speci cations may change without noti cation.
©
LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Table 13: Equivalent Piping Length for Elbows.
1/4
3/8
Elbow (ft.)
0.5
0.6
not
1/2
5/8
3/4
0.7
0.8
1.2
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