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MULTI V IV System Installation Manual
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.
Pipe Supports
A properly installed pipe system should be adequately supported to avoid pipe sagging.
Sagging pipes become oil traps that lead to equipment malfunction.
Pipe supports should never touch the pipe wall; supports shall be installed outside (around)
the primary pipe insulation jacket. 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 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 shall meet local codes.
If local codes do not specify pipe support spacing, pipe shall 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.
Pipe Sleeves and Wall Penetrations
LG requires that all pipe penetrations through walls, floors, and pipes buried
underground be properly insulated and routed through an appropriate wall sleeve
of sufficient size to prevent compression of refrigerant pipe insulation and free
movement of the pipe within the sleeve. Underground refrigerant pipe shall be
routed inside a protective sleeve to prevent insulation deterioration.
Figure 18: Pipe Hanger Details.
Figure 19: Typical Pipe Support Location—
Change in Pipe Direction.
Figure 20: Pipe Support at Indoor Unit. Figure 21: Pipe Support at Y-branch Fitting.
Figure 22: Pipe Support at Y-branch Fitting.
Max. 12"
~ 12" – 19"
A
B
A + B ~ 12" – 19"
Max. 12" Max. 12"
Max. 12"
Max. 12"
Max. 12"
Sealant
Pipe Insulation
Wall Sleeve
Pipe Slope
The horizontal pipe slope cannot exceed 10° up or down.
REFRIGERANT PIPING DESIGN
System Engineering
Figure 23: Typical Pipe Penetration.
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