U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

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iV. Venting
B. CPVC/PVC Venting (continued)
Figure 12: Field installation CPVC/PP/SS Vent Connector
Figure 13: near-Boiler Vent/Combustion air Piping
a. Plan venting system to avoid possible contact
with plumbing or electrical wires. Start at
vent connector at boiler and work towards vent
termination.
b. Design the vent system to allow 3/8 in.
(9.5 mm) of thermal expansion per 10 ft. (3.0 m)
of CPVC/PVC pipe. Runs of 20 ft. (6.1 m) or
longer that are restrained at both ends must use
an offset or expansion loop. Refer to Figure 14
and Table 15.
c. All CPVC/PVC vent and combustion air
pipe joints must be cleaned with primer and
glued with cement. Follow all manufacturer
instructions and warnings when preparing pipe
ends for joining and using the primer and the
cement.
5. Horizontal Sidewall Termination
a. Standard Two-Pipe Termination
See Figure 7.
i. Vent Piping
Running PVC vent pipe inside Enclosures
and through Walls:
• PVC vent pipe must be installed in such
way as to permit adequate air circulation
around the outside of the pipe to prevent
internal wall temperature rising above
ANSI Z21.13 standard specified limit.
• Do not enclose PVC venting. Use higher
temperature rated CPVC pipe in enclosed
spaces or to penetrate combustible or
non-combustible walls.