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17
3 General venting (continued)
PVC/CPVC vent piping materials
Use only the materials listed in Table 3A
(pg. 18) for vent pipe, and fi ttings. 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 fi nished 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 (page
20) that corresponds with the intended
vent manufacturer to be used and discard
the CPVC starter piece. The fi eld provided
vent fi ttings 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
specifi ed in this manual to make the vent
connections. Failure to follow this warning
could result in fi re, 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 fi re, personal
injury, or death.
NOTICE
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certifi ed to ULC-S636.
IPEX is an approved vent manufacturer in Canada
supplying vent material listed to ULC-S636.
2. The fi rst three (3) feet of plastic vent pipe from the
appliance fl ue outlet must be readily accessible for visual
inspection.
3. The components of the certifi ed vent system must not be
interchanged with other vent systems or unlisted
pipe/fi ttings. For concentric vent installations, the inner
vent tube must be replaced with fi eld supplied certifi ed vent
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 fi ttings using a clean dry rag.
(Moisture will retard curing and dirt or grease will prevent
adhesion.)
5. Dry fi t vent or air piping to ensure proper fi t up before
assembling any joint. The pipe should go a third to
two-thirds into the fi tting to ensure proper sealing after
cement is applied.
ƽ WARNING
Insulation should not be used on PVC
or CPVC venting materials. The use of
insulation will cause increased vent wall
temperatures, which could result in vent
pipe failure.
Installation & Operation Manual