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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
Figure 4-15: Field Installation CPVC/PP/SS Vent Connector
Figure 4-16: Near-Boiler Vent/Combustion Air Piping
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 4-18 and Table 4-17.
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 4-6.
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.
4 Venting (continued)
WARNING
Asphyxiation Hazard.
Apply supplied dielectric grease to gasket inside vent section of vent connector. Failure to apply the grease
could result in flue gas leaks from gasket rupture during vent pipe installation or gasket deterioration due to
condensate exposure.
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