10
1
Determine boiler location
Provide air openings to room:
Knight XL alone in boiler room
1. No air ventilation openings into the boiler room are
needed when clearances around the Knight XL are
at least equal to the SERVICE clearances shown in
FIG.’s 1-1 and 1-2. For spaces that do NOT supply this
clearance, provide two openings as shown in FIG. 1-1.
Each opening must provide one square inch free area per
1,000 Btu/hr of boiler input.
Knight XL in same space with other gas or oil-fi red
appliances
1. Follow the National Fuel Gas Code (U.S.) or CSA B149.1
(Canada) to size/verify size of the combustion/ventilation
air openings into the space.
Th
e space must be provided with
combustion/ventilation air openings
correctly sized for all other appliances
located in the same space as the Knight
XL.
Do not install the boiler in an attic.
Failure to comply with the above warnings
could result in severe personal injury,
death, or substantial property damage.
2. Size openings only on the basis of the other appliances in
the space. No additional air opening free area is needed
for the Knight XL because it takes its combustion air
from outside (direct vent installation).
Do not install the boiler on carpeting even
if foundation is used. Fire can result,
causing severe personal injury, death, or
substantial property damage.
If fl ooding is possible, elevate the boiler suffi
ciently to prevent
water from reaching the boiler.
Flooring and foundation
Flooring
Th
e Knight XL is approved for installation on combustible
fl ooring, but must never be installed on carpeting.
Residential garage installation
Precautions
Take the following precautions when installing the appliance
in a residential garage. If the appliance is located in a
residential garage, it should be installed in compliance with
the latest edition of the National Fuel Gas Code, ANSI Z223.1
and/or CAN/CGA-B149 Installation Code.
• Appliances located in residential garages and in
adjacent spaces that open to the garage and are not part
of the living space of a dwelling shall be installed so that
all burners and burner ignition devices are located not
less than 18 inches (46 cm) above the fl oor.
• Th
e appliance shall be located or protected so that it is
not subject to physical damage by a moving vehicle.
Vent and air piping
Th
e Knight XL requires a special vent system, designed for
pressurized venting.
Th
e boiler is to be used for either direct vent installation or
for installation using indoor combustion air. When room
air is considered, see the General Venting Section. Note
prevention of combustion air contamination below when
considering vent/air termination.
Vent and air must terminate near one another and may be
vented vertically through the roof or out a side wall, unless
otherwise specifi ed. You may use any of the vent/air piping
methods covered in this manual. Do not attempt to install the
Knight XL using any other means.
Be sure to locate the boiler such that the vent and air piping
can be routed through the building and properly terminated.
Th
e vent/air piping lengths, routing and termination method
must all comply with the methods and limits given in this
manual.
Prevent combustion air contamination
Install air inlet piping for the Knight XL as described in this
manual. Do not terminate vent/air in locations that can allow
contamination of combustion air. Refer to Table 1A, page
11 for products and areas which may cause contaminated
combustion air.
You must pipe combustion air to the boiler
air intake. Ensure that the combustion air
will not contain any of the contaminants
in Table 1A, page 11. Contaminated
combustion air will damage the boiler,
resulting in possible severe personal
injury, death or substantial property
damage. Do not pipe combustion air
near a swimming pool, for example. Also,
avoid areas subject to exhaust fumes from
laundry facilities. Th
ese areas will always
contain contaminants.
WARNING
WARNING
WARNING
Installation & Operation Manual
