Install Instructions

16
3 General venting
Installation & Operation Manual
This appliance requires a special venting
system. Use only approved stainless steel,
PVC, CPVC or polypropylene pipe and
fi ttings listed in Tables 3D, 3E, and 3G 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
 DANGER
The Knight XL 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 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.
 WARNING
NOTICE
 WARNING
For closet and alcove installations, CPVC,
polypropylene 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.
Air intake/vent connections
1. Combustion Air Intake Connector (FIG. 3-1) - Used to
provide combustion air directly to the unit from outdoors. A
fi tting is provided on the unit for fi nal connection.
Combustion air piping must be supported per guidelines
listed in the National Mechanical Code, Section 305, Table
305.4 or as local codes dictate.
2. Vent Connector (FIG.'s 3-2 thru 3-6) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fi tting is provided on the unit for
fi nal connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
The Knight XL 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.
You may use any of the vent/air piping methods covered in this
manual. Do not attempt to install the Knight XL boiler using
any other means.
You must also install air piping from outside to the boiler
air intake adapter unless following the Optional Room Air
instructions on page 19 of this manual. The resultant installation
is direct vent (sealed combustion).
 WARNING
DO NOT mix components from different
systems. The vent system could fail,
causing leakage of fl ue products into the
living space. Mixing of venting materials
will void the warranty and certifi cation of
the appliance.
 WARNING
Do not connect any other appliance to
the vent pipe or multiple boilers to a
common vent pipe. Failure to comply
could result in severe personal injury,
death, or substantial property damage.
Improper installation of venting systems
may result in injury or death.
 CAUTION
Follow the instructions in Section 1, page
12 of this manual when removing a boiler
from an existing vent system.
NOTICE
T
AIR
Figure 3-1 Near Boiler Air Piping