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Chapter 4. – Installation
General Requirements
•
Under normal conditions, this appliance will not produce an exhaust flue temperature in excess of 149°F (65°C) and schedule 40
PVC pipe may be used as the vent material.
• Make sure the vent system is gas tight and will not leak.
• Support the vent pipe with hangers at regular intervals as specified by these instructions or the instructions of the vent manufacturer.
• Do not common vent with other manufacturer’s water heaters or appliances. See page 43 to common vent with a Quick Connect
System.
• The total vent length including horizontal & vertical vent runs should be no less than 3' (0.9m).
• Do not store hazardous or flammable substances near the vent termination and check that the termination is not blocked in any way.
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.
Item
Material
United States
Canada
Exhaust Vent /Air Intake
Schedule 40 PVC
ANSI/ASTM D1785
ULC S636 Certified
Materials Only
PVC-DWV
ANSI/ASTM D2665
Schedule 40 CPVC
ANSI/ASTM F441
Pipe Cement/Primer
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
Note: Do Not Use Cellular Foam Core Pipe
• Use only solid PVC or CPVC schedule 40 pipe. Cellular foam core piping is not allowed.
• 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.
• PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.
• Follow all general venting guidelines as outlined on this page.
• The pipe shall be installed so that the first 3' (0.9m) 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:
* Squarely cut all pieces of pipe.
* Remove all burrs and debris from joints and fittings.
* 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 3' (0.9m) intervals. Do not use the water heater to support
the vent piping.
• A vent screen must be installed on the vent terminations to prevent debris or animals from entering the piping.
Vent Pipe Installation
4-2. Vent Pipe Installation
(Indoor Installation Only)
Summary of Contents for NRCP111-DV
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