Owners Manual

3
Specifications subject to change without notice.
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S In a direct−vent (2−pipe) application, your furnace uses air
from outside the home for combustion and vents flue gas to
the outdoors. This type of application will have two pipes
running from the furnace to the outdoors (see Figure 2). In
this application, the vent and air−intake pipes must terminate
outside the structure and must not be obstructed in any way.
In some cases, the inlet air pipe may be located in an area
that has access to outdoor air, such as an attic. In all cases,
the outlet vent pipe must be routed to the outdoors. Do not
bock or obstruct air openings on furnace or spaces around
furnace.
S In a non−direct vent (1−pipe) application, your furnace
uses air from adjacent to the furnace for combustion and
vents flue gas to the outdoors. This type of application will
have only one pipe running from the furnace to the outdoors.
(see Figure 3) The other pipe will terminate in the same
space as the furnace and is the source of combustion air for
your furnace. Therefore, the furnace must not be enclosed in
an airtight room or be sealed behind solid doors. It must have
adequate airflow for efficient combustion and safe
ventilation. Do not obstruct the combustion−air pipe in any
way. The vent pipe must terminate outside the structure and
must not be obstructed in any way. Do not block or obstruct
air openings or space around furnace.
! WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe personal
injury or death due to carbon monoxide poisoning, if
combustion products infiltrate into the building.
Check that all openings in the outside wall around the vent
(and air intake) pipe(s) are sealed to prevent infiltration of
combustion products into the building.
Check that furnace vent (and air intake) terminal(s) are not
obstructed in any way during all seasons.
Figure 2 Exterior Vent Pipes
L11F046
Figure 3 Interior Combustion − Air Pipe
L11F047
S Keep the area around your furnace clear and free of
combustible materials, gasoline, and other flammable liquids
and vapors.
! WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
Figure 4
NO Combustible materials near
furnace
S Do not cover the furnace, store trash or debris near it, or in
any way block the flow of fresh air to the unit.
In addition to the safety rules above, make sure that the
following combustion−air requirements are met for non−direct
vent applications:
S Combustion air must be clean and uncontaminated with
chlorine or fluorine. These compounds are present in many
products around the home, such as: water softener salts,
laundry bleaches, detergents, adhesives, paints, varnishes,
paint strippers, waxes, and plastics.
S Make sure the combustion air for your furnace does not
contain any of these compounds. During remodeling be sure
the combustion air is fresh and uncontaminated. If these
compounds are burned in your furnace, the heat exchangers
may deteriorate.
S A furnace installed in an attic or other insulated space must
be kept free and clear of insulating material. Examine the
furnace area when the furnace is installed or when insulation
is added. Some insulation materials may be combustible.