19
3
General
venting
(continued)
Installation & Operation Manual
Air contamination
Pool and laundry products and common household and hobby
products oft en contain fl uorine or chlorine compounds. When
these chemicals pass through the boiler, they can form strong
acids. Th
e acid can eat through the boiler wall, causing serious
damage and presenting a possible threat of fl ue gas spillage or
boiler water leakage into the building.
Please read the information given in Table 1A, page 11,
listing contaminants and areas likely to contain them. If
contaminating chemicals will be present near the location of the
boiler combustion air inlet, have your installer pipe the boiler
combustion air and vent to another location, per this manual.
If the boiler combustion air inlet is located in
a laundry room or pool facility, for example,
these areas will always contain hazardous
contaminants.
To prevent the potential of severe personal
injury or death, check for areas and products
listed in Table 1A, page 11 before installing
the boiler or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently.
—OR—
• Relocate air inlet and vent terminations
to other areas.
WARNING
WARNING
Optional room air
WARNING
When utilizing the single pipe method,
provisions for combustion and ventilation
air must be in accordance with Air for
Combustion and Ventilation, of the latest
edition of the National Fuel Gas Code,
ANSI Z223.1, in Canada, the latest edition
of CGA Standard B149 Installation
Code for Gas Burning Appliances and
Equipment, or applicable provisions of
the local building codes.
Table 3C Optional Room Air Kit
Commercial applications utilizing the Knight XL boiler may
be installed with a single pipe carrying the fl ue products to
the outside while using combustion air from the equipment
room. In order to use the room air venting option the
following conditions and considerations must be followed.
• Th
e unit MUST be installed with the appropriate
room air kit (Table 3C).
• Th
e equipment room MUST be provided with
properly sized openings to assure adequate
combustion air. Please refer to instructions provided
with the room air kit.
• Th
ere will be a noticeable increase in the noise level
during normal operation from the inlet air opening.
•
Using the room air kit makes the unit vulnerable to
combustion air contamination from within the
building. Please review Section 1, Prevent
Combustion Air Contamination, to ensure proper
installation.
•
Vent system and terminations must comply with the
standard venting instructions set forth in this
manual.
NOTICE
Optional room air is intended for
commercial applications. Combustion
air piping to the outside is recommended
for residential applications.
Model Description
Kit
Number
400 - 801
Filter Box Assembly
100157601
90° Elbow with Screen
100157616
Installing vent and air piping
Use only cleaners, primers, and solvents
that are approved for the materials which
are joined together.
NOTICE
PVC/CPVC
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).
NOTICE
WARNING
Th
e 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. Th
e 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 Table 3D
to make the vent connections. Failure to
follow this warning could result in fi re,
personal injury, or death.
WARNING
Insulation should not be used on PVC
or CPVC venting materials. Th
e use of
insulation will cause increased vent wall
temperatures, which could result in vent
pipe failure.
Th
is product has been approved for use with the PVC/CPVC
vent materials listed in Table 3D on page 20.
