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43
General Refrigerant Piping System Information
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
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 available to route the
insulated pipe over the obstacle, then route the pipe under the obsta-
cle. In either case, it is imperative the length of the horizontal section
of pipe above or below the obstacle be a minimum of three (3) times
the longest vertical rise (or fall) at either end of the segment.
Figure 27: Installing Piping Above and Below an Obstacle.
MINIMUM
Above an obstacle
MINIMUM
Below an obstacle
3X
X
3X
X
Pipe Supports
A properly installed pipe system must be adequately supported to avoid pipe sagging. Sag-
ging pipes become oil traps that lead to equipment malfunction.
Pipe supports must
never touch the pipe wall; supports must be installed outside
(around) the primary pipe insulation jacket. Insulate the pipe first because pipe supports
must be installed outside (around) the primary pipe insulation jacket. Clevis hangers must be
used with shields between the hangers and insulation. Field provided pipe supports must 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 insulation over
the pipe insulation jacket to prevent chafing and compression of the primary insulation in the
confines of the support 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 (5) feet on center for straight segments of pipe up to 3/4 inches outside
diameter size.
• Maximum of six (6) feet on center for pipe up to one (1) inch outside diameter size.
• Maximum of eight (8) feet on center for pipe up to two (2) inches outside diameter size.
Wherever the pipe changes direction, place a hanger within twelve (12) inches on one side
and within twelve (12) to nineteen (19) inches of the bend on the other side. Support piping
at indoor units, Y-branch, and Header fittings as shown.
Figure 28: Pipe Hanger Details.
Figure 29: Typical Pipe Support Location—
Change in Pipe Direction.
Figure 30: Pipe Support at Indoor Unit. Figure 31: Pipe Support at Y-branch Fitting.
Figure 32: Pipe Support at Header Fitting.
Max. 12"
~ 12" – 19"
Max. 12" Max. 12"
Max. 12"
Max. 12"
Max. 12"
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saddles between hanger bracket and insula-
tion to promote linear expansion/contraction.
REFRIGERANT SYSTEM ENGINEERING
~12" – 19"
Maximum 12"
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