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MUL
TI V Space II Installation Manual
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.
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, page 23.
In-line refrigeration components
Components such as oil traps, solenoid valves, filter-dryers, sight glasses, tee fittings, and other after-market accessories are not permitted
on the refrigerant piping system between the outdoor units and the indoor units. Multi V Space II systems are provided with redundant sys-
tems that assure oil is properly returned to the compressor. Sight-glasses and solenoid valves may cause vapor to form in the liquid stream.
Over time, dryers may deteriorate and introduce debris into the system. The designer and installer should verify the refrigerant piping system
is free of traps, sagging pipes, sight glasses, filter dryers, etc.
field-provided Isolation Ball Valves
LG allows the installation of field-supplied ball valves with Schrader ports at each indoor unit. Full-port isolation ball valves with Schrader
ports (positioned between valve and indoor unit) rated for use with R410A refrigerant should be used on both the liquid and vapor lines.
If valves are not installed and a single indoor unit needs to be removed or repaired, the entire system must be shut down and evacuated. If
isolation ball valves are installed, and an indoor unit needs to be repaired, the unaffected indoor units can remain operational. Reclamation
of refrigerant, then, can be restricted to a single indoor unit.
Position valves with a minimum distance of three (3) to six (6) inches of pipe on either side of the valve, and placed between six (6) and
twelve (12) inches from the Y-branch or header connecting the run-out pipe to the upstream main or branch pipe. If ball valves are installed
closer to the indoor unit, a section of pipe becomes a dead zone when the valves are closed where oil may accumulate.
Valves shall be accessible for service. If necessary, install drywall access doors or removable ceiling panels, and position the valves to
face the access door or ceiling panel opening. Mount valves with adequate space between them to allow for placement of adequate pipe
insulation around the valves. Recommended best practice is to clearly label and document locations of all service valves, Y-branches, and
headers.
using elbows
Field supplied elbows are allowed as long as they are designed for use with R410A refrigerant. The designer and installer, however, should
be cautious with the quantity and size of fittings used, and must account for the additional pressure losses in equivalent pipe length calcula-
tion for each branch. The equivalent pipe length of each elbow must be added to each pipe segment in the LATS program. See page 27 for
equivalent lengths.
General InstallatIon GuIDelInes
Piping Materials and Handling
Summary of Contents for Multi V ARUN053GF2
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