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Venting With PVC or CPVC
This appliance can be vented with non cellular core plastic pipe materials as specified in the below table.
Vent installations in Canada which utilize plastic vent systems must comply with ULC S636. This appliance
may also be vented with materials approved for Category IV appliances; refer to page 15 for instructions.
Item
Exhaust Vent
Pipe Cement/Primer
PVC/CPVC Installation Instructions
•
Use only solid PVC or CPVC schedule 40 pipe. Cellular foam core piping is not allowed.
•
75mm (3") PVC or CPVC schedule 40 pipe may also be used on this appliance, however the
BTUH input of the appliance will be reduced by up to 5%. Refer to page 14 for additional instructions.
•
In Canada, plastic vent systems must be certified to ULC S636. The components of the certified
vent system must not be interchanged with other vent systems or unlisted pipe/fittings.
•
In Canada, specified primers and glues of the ULC S636 certified vent system must be from a
single system manufacturer and not intermixed with other system manufacturer's vent system
parts.
•
Follow all general venting guidelines as outlined on pages 12 and 14 of this Installation Manual.
•
PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.
•
The pipe shall be installed so that the first 0.9m (3') of pipe from the appliance flue outlet is readily
accessible for visual inspection.
•
When preparing and assembling the pipe, follow instructions as provided by the pipe
manufacturer. In general, the following practices must be observed:
o
Squarely cut all pieces of pipe.
o
Remove all burs and debris from joints and fittings.
o
All joints must be properly cleaned, primed, and cemented. Use only cement and primer
approved for use with the pipe material as outlined in the above table.
•
All piping must be fully supported. Use pipe hangers at a minimum of 0.9m (3') intervals. Do not use
the water heater to support the vent piping.
•
When attaching the piping to the water heater, a Noritz PVC/CPVC adapter must be used. This
adapter is not supplied with the water heater and must be purchased separately (part #VP4-ADAPT-PVC,
use part #VP4x3-ADAPT-PVC when using 75mm (3") PVC or CPVC). It is not necessary to use cement
or silicone on this adapter as it is self sealing.
•
A bird screen must be installed on the vent termination to prevent debris or animals from entering
the piping. This screen is not supplied with the water heater and must be purchased separately
(part #VT4-PVCS, use part #VT3-PVCS when using 75mm (3") PVC or CPVC).
Material
Schedule 40 PVC
PVC-DWV
Schedule 40 CPVC
PVC
CPVC
Note: Do Not Use Cellular Foam Core Pipe
WARNING
CARBON MONOXIDE POISONING
Failure to properly seal the vent system could
cause flue products to enter the living space.
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2564
ANSI/ASTM F493
Canada
ULC S636 Certified
Materials Only
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