Refrigerant Piping - LG LMN078HVT Installation & Maintenance

GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Preparing for Piping Installation to the Indoor Unit
Note:
Do not bend the piping / drain hose from side to side, it may damage the components.
Prepare the refrigerant piping and drain hose (indoor unit piping) for installation through the wall. Press on the top of the tubing clamp
and slowly guide the piping/hose down (depending on installation requirements, then to the left or right). Relock the tubing clamp after
the piping/hose are released.
No Pipe Size Substitutions
Use only the pipe size selected by the LATS Multi F pipe system design software or as conveyed in the product installation instructions.
Using a different size is prohibited and may result in a system malfunction or failure to work at all.
Pipe Slope
The horizontal pipe slope cannot exceed 10° up or down. Y-branches have additional restrictions described below.
In-line Refrigeration Components
Components such as oil traps, solenoid valves, filter-dryers, sight glasses, tee fittings, and other after-market accessories are not per-
mitted on the refrigerant piping system between the outdoor units and the indoor / branch distribution units.
Multi F/Multi F Max systems have redundant systems that ensure oil is properly returned to the compressor. Sight-glasses and solenoid
valves may cause vapor to form in the liquid stream.
Note:
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 recommends installing 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.
For Multi F MAX systems, position valves with a minimum distance of three (3) to six (6) inches of pipe on either side of the valve, and
between six (6) and twelve (12) inches from the first upstream Y-branch or branch distribution unit. If ball valves are installed away from
the first Y-branch and/or branch distribution unit and closer to the indoor unit, oil may accumulate where it cannot be returned to the
outdoor unit and may cause a shortage of oil in the compressor.
Valves should be easily 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.
Obstacles
When an obstacle, such as an I-beam or concrete T, is in the
path of the planned refrigerant pipe run, it is best practice to
route the pipe over the obstacle. If adequate space is not avail-
able to route the insulated pipe over the obstacle, then route
the pipe under the obstacle. In either case, it is imperative the
horizontal section of pipe above or below the obstacle be a
minimum of three (3) times greater than the longest vertical rise
(or fall) distance.
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Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 13: Installing Piping Above and Below an Obstacle.
Above an obstacle.
F
MULTI
F
MULTI MAX
Minimum
3X
Below an obstacle.