LG Multi V water mini Series Installation Operation & Maintenance page 30

REFRIGERANT PIPING DESIGN
System Engineering
Pipe Supports
A properly installed pipe system should be adequately supported to avoid pipe sagging. Sag-
ging 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 (see Figure 22). 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 de-
signed 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 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 shall meet local codes.
If local codes do not specify pipe support spacing, pipe shall be supported:
• Maximum of five feet (5') on center for straight segments of pipe up to 3/4" outside
diameter size.
• Maximum of six feet (6') on center for pipe up to one inch (1") outside diameter size.
• Maximum of eight feet (8') on center for pipe up to two inches (2") 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 23. Support piping at indoor units as shown in Figure 24. Support Y-
Branch and Header fittings as shown in Figures 25 and 26.
Figure 24: Pipe Support at Indoor Unit.
Pipe Slope
The horizontal pipe slope cannot exceed 5° up or down.
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.
30
Figure 25: Pipe Support at Y-branch Fitting.
B
A
A + B ~ 12" – 19"
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.
Max. 12" Max. 12"
Max. 12"
Figure 22: Pipe Hanger Details.
Figure 23: Typical Pipe Support Location—
Change in Pipe Direction.
~ 12" – 19"
Figure 26: Pipe Support at Header Fitting.
Max. 12"
Figure 27: Typical Pipe Penetration.
Sealant
Wall Sleeve
Max. 12"
Max. 12"
Pipe Insulation