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Installation & Operation Manual
3 General venting
Air contamination
Pool and laundry products and common household and hobby
products often contain fluorine or chlorine compounds. When
these chemicals pass through the boiler, they can form strong
acids. The acid can eat through the boiler wall, causing serious
damage and presenting a possible threat of flue 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.
Removing from existing vent
Follow the instructions in Section 1, page 12 of this manual
when removing a boiler from an existing vent system.
Vent and air piping
Vent and air system:
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.
You must also install air piping from outside to the boiler air
intake adapter. The resultant installation is direct vent (sealed
combustion).
You may use any of the vent/air piping methods covered in
this manual. Do not attempt to install the Knight boiler using
any other means.
NOTICE
ƽ WARNING
ƽ WARNING
ƽ WARNING
Model Kit Number
Equivalent Vent
Length
81 - 211 CVK3003 3 feet
286 CVK3007 3 feet
Table 3D Concentric Vent Kit Equivalent Vent Lengths
Vent, air piping and termination:
The Knight boiler vent and air piping can be installed through
the roof or through a sidewall. Follow the procedures in this
manual for the method chosen. Refer to the information
in this manual to determine acceptable vent and air piping
length.
Optional room air
ƽ 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.
• There 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.
Model Kit Number
81 - 211 KIT30052
286 KIT30053
Table 3E Optional Room Air Kit
DO NOT mix components from different
systems. The vent system could fail,
causing leakage of flue products into the
living space. Use only approved stainless
steel, PVC or CPVC pipe and fittings. For
PVC/CPVC use with primer and cement
specifically designed for the material used.
Commercial applications utilizing the Knight boiler may
be installed with a single pipe carrying the flue 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.
• The unit MUST be installed with the appropriate
room air kit (Table 3E).
• The equipment room MUST be provided with
properly sized openings to assure adequate
combustion air. Please refer to instructions provided
with the room air kit.
NOTICE
Optional room air is intended for
commercial applications. Combustion
air piping to the outside is recommended
for residential applications.