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Installation & Operation Manual
17
3 General venting (continued)
PVC/CPVC vent piping materials
Use only the materials listed in Table 3A
(pg. 18) 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.
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 if PVC/CPVC vent is to be used.
For stainless steel venting use an adapter
from Table 3B (pg. 20) that corresponds
with the intended vent manufacturer to be
used and discard the CPVC starter piece.
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 or
stainless steel material MUST BE used in a
closet/alcove structure. Failure to follow
this warning could result in fire, personal
injury, or death.
NOTICE
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.
Installing vent or air piping
Improper installation of PVC or CPVC
systems may result in injury or death.
ƽ CAUTION
Use only cleaners, primers, and solvents that
are approved for the materials which are
joined together.
NOTICE
1. Work from the boiler to vent or air termination. Do not
exceed the lengths given in this manual for the air or vent
piping.
2. Cut pipe to the required lengths and deburr the inside and
outside of the pipe ends.
3. Chamfer outside of each pipe end to ensure even cement
distribution when joining.
4. Clean all pipe ends and fittings using a clean dry rag.
(Moisture will retard curing and dirt or grease will prevent
adhesion.)
5. Dry fit vent or air piping to ensure proper fit up before
assembling any joint. The pipe should go a third to
two-thirds into the fitting to ensure proper sealing after
cement is applied.