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b. Cement rain cap to smaller diameter kit pipe. (See Figure 21).
5. Install concentric Y fitting and pipe assembly through the structure’s hole and field-supplied roof
boot/flashing. Do not allow insulation or other materials to accumulate inside pipe assembly when
installing through the hole.
6. Install rain cap and small diameter pipe assembly in concentric Y fitting and large pipe assembly. Ensure
small diameter pipe is cemented and bottomed in concentric Y fitting.
7. Secure assembly to structure as shown in Figure 23. Ensure clearances as shown in Figure 23.
Figure 23. Concentric Vent Side Wall Attachment
8. Cement heater combustion-air and vent pipes to concentric Y fitting termination assembly. See Figure 23
for proper pipe attachment.
9. Operate heater through one cycle to ensure combustion-air and vent pipes are properly connected to
concentric vent termination connections.
VENT PIPE PREPARATION
WARNING
DO NOT attempt to start this water heater until vent pipe solvent fumes completely clear
from the room and inside the vent piping.
INITIAL PREPARATION
1. Make sure the solvent cement you are planning to use is designed for the specific application you are
attempting.
2. Know the physical and chemical characteristics and limitations of the PVC, PVC cellular core, ABS or
CPVC piping materials that you are about to use.
3. Know the reputation of your pipe and cement manufacturer and their products.
4. Know your own qualifications or those of your contractor. The solvent welding technique of joining
PVC, PVC cellular core, ABS or CPVC pipe is a specialized skill just as any other pipe fitting technique.
5. Closely supervise the installation and inspect the finished job before start-up.
6. Contact the manufacturer, supplier, or competent consulting agency if you have any questions about the
application or installation of PVC, PVC cellular core, ABS or CPVC pipe.
7. Take the time and effort to do a professional job. Shortcuts will only cause you problems and delays in
start-up. The majority of failures in these systems are the result of shortcuts and/or improper joining
techniques.
INTERNET VERSION FOR REFERENCE ONLY