Refrigerant Piping - LG LCN097HV4 Installation Manual

F
MULTI
F
MULTI MAX
Insulating the Drain Piping
• Drain piping insulation should be made of polyethylene foam with a minimum thickness
of 7/16 inches.
• Secure drain hose insulation at the drain port connection on the indoor unit so that no
gaps exist.
Note:
LG Electronics U.S.A.,Inc., is not responsible for any piping calculations, refrigerant leaks,
degradation of performance, or any other potential problems or damages as a result of inter-
connecting piping, their joint connections, isolation valves, introduced debris inside the piping
system, or other problems caused by the interconnecting piping system.
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 on the next page.
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 maintains a neutral position on using isolation valves in VRF refrigerant piping systems. LG does not endorse any manufacturer of isola-
tion valves. It is recognized that installing isolation valves may simplify future maintenance requirements, and, if used, considerations should
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 may 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 may be voided in whole or part should any field supplied accessory
fail in any way that causes product failure.
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.
GENERAL INSTALLATION GUIDELINES
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.
Insulating Drain Piping / Refrigerant Piping
Figure 17: Insulating the Drain Piping.
Figure 18: Installing Piping Above and Below an Obstacle.
Above an obstacle.
Insulation (Field Supplied)
Drain Piping
(Field Supplied)
Indoor Unit
Elbow
Drain Pump
Minimum
3X
Below an obstacle.
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