27
General Installation Guidelines
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GENERAL INSTALLATION GUIDELINES
Using Elbows
Field-supplied elbows are allowed as long as they are long radius and designed for use with R410A refrigerant. The designer, however,
should be cautious with the quantity and size of fittings used, and must account for the additional pressure losses in equivalent pipe length
calculation.
The equivalent pipe length of each elbow must be added to each pipe segment (Figure 23).
Piping Support, Elbow Usage
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 (see Figure 24). 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.
Figure 24: Pipe Hanger Details
Figure 25: Typical Pipe Support Location—
Change in Pipe Direction
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 pipe clamps within twelve (12) inches on
one side and within twelve to nineteen (12 to 19) inches of the bend on the other side as
A
B
Pipe
Clamps
A + B
≈
12”–19”
Component
Size (Inches)
Elbow (ft.)
1/4
3/8
1/2
5/8
3/4
0.5
0.6
0.7
0.8
1.2
Figure 23: Equivalent Piping Length for Piping Components
