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3
General venting
Removing from existing vent
Follow the instructions in Section 1, page 11 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
NOTICE
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 wall mount
boiler using any other means.
WARNING DO NOT mix components from different
systems.
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.
Vent, air piping and termination:
The Knight wall mount 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
Optional room air is intended for
NOTICE
commercial applications. Combustion air
piping to the outside is recommended for
residential applications.
Commercial applications utilizing the Knight wall mount
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 3D).
•
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.
•
There will be a noticeable increase in the noise level
during normal operation from the inlet air opening.
20
The vent system could fail,
Installation & Operation Manual
•
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.
When utilizing the single pipe method,
WARNING
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 3D Optional Room Air Kit
Model
Vent Size
55 - 110
55 - 285
199 - 399
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 10,
listing contaminants and areas likely to contain them.
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
WARNING
in a laundry room or pool facility, for
example, these areas will always contain
hazardous contaminants.
To prevent the potential of severe personal
WARNING
injury or death, check for areas and products
listed in Table 1A, page 10 before installing
the boiler or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently.
• Relocate air inlet and vent
terminations to other areas.
Kit Number
2"
KIT30051
3"
KIT30052
4"
KIT30053
—OR—
If
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