Velocity Raptor RPTR155, Installation And Operating Instructions Manual, Page: 43 / 172

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VII. Venting
E. Assembly of CPVC/PVC Vent Systems (continued)
WARNING
Asphyxiation Hazard. Failure to follow these instructions could cause products of combustion to
enter the building, resulting in severe property damage, personal injury or death.
The use of cellular core PVC (ASTM F891), cellular core CPVC or Radel (polyphenolsulfone is
prohibited.
All condensate that forms in the vent must be able to drain back to the boiler.
Never leave the boiler in operation without the gas sample cap in place (Figure 7.26).
E. Assembly of CPVC/PVC Vent Systems
1. Assemble the vent system, starting at the boiler:
a. If 3" PVC is to be used for venting, at least one 3" CPVC elbow and at least one 30" straight section of CPVC must be
used before transitioning to PVC. If necessary the 30" straight section of CPVC may be cut in any location and the CPVC
elbow inserted between the two resulting segments. 3" PVC Sidewall Vent Kit, P/N 107039-02, is available and includes
30" CPVC starter and elbow, PVC terminations, and screens.
b. When cutting CPVC or PVC pipe, use a miter saw or a saw designed to cut PVC pipe. Use a miter box or other method to
cut pipe squarely. De-burr both the inside and outside of the cut end.
c. Dry fit all vent components before assembly.
d. The vent adaptor has two different inside diameters. The larger (upper) inside diameter accepts 3" CPVC pipe and is used
in this application (the smaller, lower, inside diameter accepts 3" nominal PolyPro, Polyflue or InnoFlue). Lubricate the
upper gasket in the vent adaptor with water and insert the first piece of 3" CPVC into the vent adaptor until it bottoms out.
Tighten clamp on vent adapter to secure vent pipe.
e. If 2" CPVC is to be used for the vent system, reduce the first piece of 3" CPVC installed in Step (b) to 2" CPVC using a
CPVC reducing coupling or elbow. Otherwise assemble the 3" CPVC elbow and the remainder of the 30" CPVC piping
before transitioning to PVC. If 3" PVC is used, the first piece of PVC will either be connected to the CPVC elbow or the
end of a section of CPVC vent pipe. In the latter case, a PVC coupling may be used to connect the first piece of PVC to
the last piece of CPVC. 2" PVC Sidewall Vent Kit, P/N 107039-01, is available and includes 30" CPVC starter and elbow,
2" x 3" reducing bushings, PVC terminations, and screens.
f. Clean all CPVC and PVC components with the appropriate primer before cementing. Cement the vent system together,
starting at the boiler and following the instructions provided on the cans of cement and primer. Use a field supplied
cement and primer that is listed for use with the materials being joined (CPVC and/or PVC). The following, or its
equivalent, may be used to join CPVC to PVC:
• IPS Corporation #P-70 Primer
• IPS Corporation #790 Multi-Purpose Solvent Cement
Always use primer on both the pipe and fitting before applying the cement. Assemble the pipe in accordance with the
instructions on the cans of primer and cement.
g. Assemble the rest of the vent system, being sure to pitch horizontal sections back towards the boiler 1/4"/ft. Support the
vent at intervals not exceeding 4ft.
DANGER
Failure to follow this warning could result in asphyxiation and/or carbon monoxide poisoning. Correct
venting material and installation is required for proper vent operation. PVC Vent Systems must
include at least 30 inches of CPVC and one CPVC elbow between the boiler and PVC vent piping. See
this Section, VII. Venting for complete information.
Use CPVC vent components within any interior space where air cannot circulate freely, including
through vertical or horizontal chase ways, inside a stud wall, in closets and through wall penetrations.