Sealing Of Pvc, Cpvc Or Abs; Pvc/Cpvc Vent Piping Materials - Watts Aerco TAG-0072 GF-146-E Operation & Maintenance Manual

AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL – VENT & COMBUSTION AIR PIPING
6.5.2 Sealing of PVC or CPVC
The PVC or CPVC should be cleaned and sealed with the pipe manufacturer's recommended
solvents and standard commercial pipe cement for the material used. The PVC or CPVC should
use a silicone sealant to ensure a proper seal at the appliance connection and the air inlet cap
connection. Proper sealing of the air inlet pipe ensures that combustion air will be free of
contaminants and supplied in proper volume.
When a sidewall or vertical rooftop combustion air supply system is disconnected for any
reason, the air inlet pipe must be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.

6.5.3 PVC/CPVC Vent Piping Materials

Installation must comply with local requirements and with the National Fuel Gas Code, ANSI
Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.
For installation in Canada, vent pipe system must be certified to ULC-S636.
Installation of a PVC/CPVC vent system should adhere to the PVC/CPVC vent manufacturer's
installation instructions supplied with the vent system.
WARNING!
Do not insulate PVC/CPVC exhaust pipes nor install into an enclosure, closet, alcove or any
other obstruction thereby preventing the cooling of the exhaust pipe.
WARNING!
PVC venting is only approved for installations with a difference of >35 degrees between
supply and return temperature, and a return temperature less than 145°F. For lower ΔT
systems, cPVC, polypropylene, or stainless steel venting is required. A high temperature kit
will also be required. Contact your manufacturer's representative for further information.
OMM-0100_E • GF-146 • 11/15/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 70 of 170