39
E. Assembly of CPVC/PVC Vent Systems
1. The components shown in Table 7.26 are supplied with this boiler for use in a 3” CPVC/PVC vent system. PVC piping must
besuppliedbytheinstallerfortheairintakepipeandanyventingbeyondtherst30”.
2. Assemble the vent system, starting at the boiler:
a. If 3” PVC is to be used for venting, the 3” CPVC elbow and the 30” straight section of CPVC provided with the
boiler 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.
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. Drytallventcomponentsbeforeassembly.
d. The vent adaptor has two different inside diameters. The larger (upper) inside diameter accepts 3” CPVC pipe and
isusedinthisapplication(thesmaller,lower,insidediameteraccepts3”nominalPolypro,PolyueorInnoFlue).
A locking ring in the adaptor prevents the vent pipe from coming out of the adaptor once it is inserted. Lubricate
theuppergasketintheventadaptorwithwaterandinserttherstpieceof3”CPVCintotheventadaptoruntilit
bottoms out.
e. If2”CPVCistobeusedfortheventsystem,reducetherstpieceof3”CPVCinstalledinStep(b)to2”CPVC
using a CPVC reducing coupling or elbow. Otherwise assemble the 3” CPVC elbow and the remainder of the 30”
CPVCpipingbeforetransitioningtoPVC.If3”PVCisused,therstpieceofPVCwilleitherbeconnectedtothe
CPVC elbow supplied with the boiler, or the end of a section of CPVC vent pipe. In the latter case, a PVC coupling
maybeusedtoconnecttherstpieceofPVCtothelastpieceofCPVC.
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
eldsuppliedcementandprimerthatislistedforusewiththematerialsbeingjoined(CPVCand/orPVC).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
Alwaysuseprimeronboththepipeandttingbeforeapplyingthecement.Assemblethepipeinaccordancewith
the instructions on the cans of primer and cement.
TABLE 7.26: CPVC/PVC VENT KIT COMPONENTS
QUANTITY DESCRIPTION SIZE
1 30” STRAIGHT CPVC PIPE 3”
1 CPVC ELBOW 3”
1 PVC COUPLING TERMINATION 3”
1 PVC 90° ELBOW TERMINATION 3”
2 RODENT SCREEN 3”
To Next Page
Loading...
