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No Pipe Size Substitutions
Using a different size is prohibited and may result in a system malfunction or failure to work at all.
Refrigerant Piping System Layout
Pipe Supports
Pipe supports should never touch the pipe wall; supports shall be installed outside (around) the primary
pipe insulation jacket (see Figure 50). Insulate the pipe first because pipe supports shall be installed
outside (around) the primary pipe insulation jacket. Clevis hangers should be used with shields between
the hangers and insulation.
Field provided pipe supports should be designed to meet local codes. If allowed by code, use fiber straps
or split-ring hangers suspended from the ceiling on all-thread rods (fiber straps or split ring hangers can
be used as long as they do not compress the pipe insulation). Place a second layer of in-
sulation over the pipe insulation jacket to prevent chafing and compression of the primary
insulation within the confines of the support pipe clamp.
A properly installed pipe system will have sufficient supports to avoid pipes from sagging
during the life of the system. As necessary, place supports closer for segments where
potential sagging could occur. Maximum spacing of pipe supports must meet local codes.
If local codes do not specify pipe support spacing, pipe must be supported: Maximum of
five feet (5′) on center for straight segments of pipe up to 3/4" outside diameter size.
Wherever the pipe changes direction, place a hanger within twelve (12) inches on one side
and within twelve to nineteen (12 to 19) inches of the bend on the other side as shown in
Figure 51.
Figure 51: Typical Pipe Support Location—Change
in Pipe Direction.
Max. 12"
~ 12" – 19"
Figure 50: Pipe Hanger Details.
A
B
A + B ~ 12" – 19"
Figure 52: Pipe Support at Indoor Unit.
Figure 49: Installing an Insert Into a
Concrete Beam.
Inserts and Pipe Supports
Inserts
An insert can be installed into a floor or beam before the concrete sets so that fittings such as ducts,
pipes, or suspension bolts can be added at a later time. Decide where the inserts should be placed
before support installation.
A properly installed pipe system should be adequately supported to avoid pipe sagging. Sagging pipes
become oil traps that lead to equipment malfunction.
Concrete Beam
Insert
Suspension Bolt
Anti-vibration Material
Nail
INSTALLATION & LAYOUT BEST PRACTICES
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
FOUR-WAY CASSETTE | 67
Refrigerant Piping Design and Best Practices
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