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3 General venting
PVC/CPVC vent piping materials
Use only the materials listed in Table 3A
below for vent pipe, and fittings. Failure to
comply could result in severe personal injury,
death, or substantial property damage.
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.
Table 3A PVC, Vent Pipe, and Fittings
Install vent and combustion air piping
ƽ DANGER
The Knight XL must be vented and supplied
with combustion and ventilation air as
described in this section. Ensure the vent
and air piping and the combustion air supply
comply with these instructions regarding
vent system, air system, and combustion air
quality. See also Section 1 of this manual.
Inspect finished vent and air piping
thoroughly to ensure all are airtight and
comply with the instructions provided and
with all requirements of applicable codes.
Failure to provide a properly installed vent
and air system will cause severe personal
injury or death.
All PVC vent pipes must be glued, properly
supported, and the exhaust must be pitched
a minimum of a 1/4 inch per foot back to
the boiler (to allow drainage of condensate).
This appliance requires a special venting
system. The vent connection to the
appliance must be made with the starter
CPVC pipe section provided with the
appliance. The field provided vent fittings
must be cemented to the CPVC pipe section
using an “All Purpose Cement” suitable for
PVC and CPVC pipe. Use only the vent
materials, primer, and cement specified in
this manual to make the vent connections.
Failure to follow this warning could result in
fire, personal injury, or death.
ƽ WARNING
NOTICE
ƽ WARNING
ƽ WARNING
For closet and alcove installations, CPVC
material MUST BE used in a closet/alcove
structure. Failure to follow this warning
could result in fire, personal injury, or death.
NOTICE
All vent pipe materials and fittings must comply with the following:
Item Material
Standards for installation in:
United States Canada
Vent pipe and fittings
PVC schedule 40 ANSI/ASTM D1785
CPVC and PVC venting must be
ULC-S636 Certified. IPEX is an
approved manufacturer in Canada
supplying vent material listed to
ULC-S636.
PVC-DWV ANSI/ASTM D2665
CPVC schedule 40 ANSI/ASTM F441
Pipe cement/primer
PVC ANSI/ASTM D2564
IPEX System 636
Cements & Primers
CPVC ANSI/ASTM F493
NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
IPEX is an approved vent manufacturer in Canada
supplying vent material listed to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3. The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings. For concentric vent installations, the inner
vent tube must be replaced with field supplied certifiedvent
material to comply with this requirement.
16
Installation & Operation Manual