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Clearances to Combustibles
This furnace is Design Certified by CSA Inter-
national for the minimum clearances to com-
bustible material listed in Table 3. Refer to the
furnace rating plate, located inside of the fur-
nace cabinet, for the specific model number
and clearance information.
Access for positioning and servicing the unit
must be considered when locating unit. 24
inches is the minimum required clearance from
the front of the unit for servicing it. 30 inches is
the minimum required clearance from the front
of the unit for positioning it. 36 inches is the
recommended clearance from the front of
the unit. Please note that a panel or door can
be located such that the minimum clearance on
the rating plate is satisfied, but that panel or door
must be removable and allow the appropriate
clearance for your installation.
This furnace is certified for use on wood flooring.
This furnace must not be installed directly on
carpeting, tile, or any combustible material
other than wood flooring.
A gas-fired furnace installed in a residential
garage must be installed so the burners and the
igniter are located not less than 18 inches (457
mm) above the floor, and the furnace must be
located or protected to avoid physical damage
by vehicles.
WARNING:
!
Do not place combustible material on or
against the furnace cabinet or within 6
inches of the vent pipe (for B-vent use the
recommended clearance). Do not place
combustible materials, including gasoline
and any other flammable vapors and
liquids, in the vicinity of the furnace.
VENTING AND COMBUSTION
AIR REQUIREMENTS
General
Provisions must be made in the installation of this
furnace to provide an adequate supply of air for
combustion. Detailed instructions for determining
the adequacy of an installation can be found in the
current revision of the National Fuel Gas Code
(ANSI Z223.1 / NFPA54) or in applicable local
building codes. Consult local codes for special
requirements. For Canadian installations consult
Canadian Installations Codes and (CAN/CGA
B149.1 or .2).
If the furnace is operated with inadequate air for
combustion one of the flame roll-out switches
located in the burner compartment or the vent
switch will open, turning off the gas supply to the
burners. These safety devices are manually
reset switches. DO NOT install jumper wires
across these switches to defeat their function.
DO NOT reset a switch without identifying and
correcting the fault condition. If a switch must be
replaced, use only the correct part specified in
the Replacement Parts List.
Air openings in the furnace door, supply air
registers, and return air grilles must not be
restricted.
!
CAUTION:
Combustion air must not be drawn from
a corrosive atmosphere.
To maximize heat exchanger life, the combustion
air must be free of chemicals which form
corrosive acidic compounds in the combustion
gases. Some examples of these chemicals are
chlorine, fluorine, and sulphur. Some common
sources of these chemicals are detergents,
bleaches, aerosol sprays, cleaning solvents,
and a wide variety of commercial and household
products.
When installing a furnace in a commercial building
or in a laundry room or workshop of a residence,
it may be necessary to provide outside air to the
furnace for combustion.
!
WARNING:
Furnace installation using methods
other than those described in the
following sections must comply with
the National Fuel Gas Code and all
applicable local codes to provide
sufficient combustion air for the furnace.
Installation In An Unconfined Space
An unconfined space is an area including all
rooms not separated by doors with a volume
greater than 50 cubic feet per 1,000 Btuh of the
combined input rates of all appliances which draw
7
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