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32
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI
F
MAX
MULTI
F
Pipe Slope
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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 / branch distribution units. Multi F and Multi F MAX systems are
provided with redundant systems 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.
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 18.
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 35 for
equivalent lengths.
GENERAL INSTALLATION GUIDELINES
Piping Materials and Handling
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
thickness 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.
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problems or damages as a result of interconnecting piping, their joint connections, isolation valves, introduced debris inside the piping system,
or other problems caused by the interconnecting piping system.
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