LG ARUM072BTE5 Installation Manual page 50

REFRIGERANT SYSTEM ENGINEERING
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.
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 as shown.
Pipe Support at Indoor Unit.
50
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.
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Installing Piping Above and Below an Obstacle.
3X
MINIMUM
Above an obstacle
Max. 12" Max. 12"
Max. 12"
X
3X
MINIMUM
Below an obstacle
Pipe Hanger Details.
Use a 4" + long sheet curved sheet metal
saddles between hanger bracket and insulation
to promote linear expansion/contraction.
Typical Pipe Support Location—Change in Pipe
Direction.
~ 12" – 19"
Pipe Support at Header Fitting.
Max. 12"
X
Max. 12"
Max. 12"