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Specification Guide

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66 | DUCTED
Ceiling-Concealed Ducted System Engineering Manual
No Pipe Size Substitutions
Use only the pipe size as conveyed in the product installation instructions. Using a different size is prohibited and may result in a system
malfunction or failure to work at all.
Figure 48: 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.
Concrete Beam
Insert
Suspension Bolt
Anti-vibration Material
Nail
Figure 49: Typical Pipe Support Location—Change in Pipe Direction.
A properly installed pipe system should be adequately supported to avoid pipe sagging. Sagging pipes
become oil traps that lead to equipment malfunction.
Figure 50: Pipe Support at Indoor Unit.
Pipe Supports
Pipe supports should never touch the pipe wall; supports shall be installed outside (around) the primary
pipe insulation jacket (see Figure 51). 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 insula-
tion). 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 must meet local codes.
If local codes do not specify pipe support spacing, pipe must be supported a 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 49.
Figure 51: Pipe Hanger Details.
Max. 12"
~ 12" – 19"
A
B
A + B ~ 12" – 19"
Refrigerant Piping System Layout
INSTALLATION & LAYOUT BEST PRACTICES