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Installation & Operation Manual
14
3 General venting
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 Vent Pipe, and Fittings
Install vent and combustion air piping
ƽ DANGER
The Knight wall mount boiler 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 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.
4. The 2" and 3" Concentric Vent Kits available from
Lochinvar (see Section 4 – Sidewall Termination – Optional
Concentric Vent) and the 2" and 3" Concentric Vent Kits
available from IPEX are approved for use on the Knight
wall mount boiler. Both kits are listed to the ULC-S636
standard for use in Canada.
For installations using 2" vent, the first seven
(7) equivalent feet of vent must be CPVC
(field supplied). See examples below.
ƽ WARNING
Examples: 1. Seven (7) feet vertical
2. Connector + 90° elbow + 2 feet horizontal
3. One (1) foot vertical + 90° elbow + 1 foot
horizontal