4
SAFETY
CONSIDERATIONS
Recognize safety information. This is
the safety-alert symbol
. When you
see this symbol on the furnace and in
instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER,
WARNING, CAUTION, and NOTE.
DANGER, WARNING and CAUTION
are used with the safety-alert symbol.
DANGER identifies the most serious
hazards which
will
result in severe per-
sonal injury or death. WARNING signi-
fies hazards which
could
result in
personal injury or death. CAUTION is
used to identify unsafe practices which
would
result in minor personal injury or
product and property damage. NOTE
is used to highlight suggestions which
will
result in enhanced installation,
reliability, or operation.
To minimize the possibility of serious
personal injury, fire, damage to
your furnace, or improper operation,
carefully follow these safety rules:
Your gas furnace uses air adjacent to the
furnace for combustion and vents flue
gas to the outdoors. Do not enclose it in
an airtight room or seal it behind solid
doors. It must have adequate airflow for
efficient combustion and safe ventila-
tion. The vent pipe must terminate out-
side the structure and must not be
obstructed in any way. Do not block or
obstruct air openings on furnace or
spaces around furnace.
3
• Keep the area around your furnace
clear and free of combustible materials,
gasoline, and other flammable liquids
and vapors.
4
• Do not cover the furnace, store trash
or debris near it, or in any way block
the flow of fresh air to the unit.
• Combustion air must be clean and
uncontaminated with chlorine or fluo-
rine. 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.
• 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.
• 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 fur-
nace is installed or when insulation is
added. Some insulation materials may
be combustible.
This furnace contains SAFETY
DEVICES which must be MANU-
ALLY RESET. If the furnace is left un-
attended for an extended period of time,
have it checked periodically for proper
operation. This precaution will prevent
problems associated with no heat, such
as frozen water pipes, etc. See “Before
You Request a Service Call” section in
this manual.
BEFORE STARTING
YOUR FURNACE
Examine the furnace installation to
determine that:
1. All flue gas carrying areas external
to the furnace (i.e. chimney, vent
connector) are clear and free of
obstructions.
2. The vent connector is in place,
slopes upward and is physically
sound without holes or excessive
corrosion.
3. The return-air duct connection(s)
is physically sound, is sealed to the
furnace casing, and terminates
outside the space containing the
furnace.
4. The physical support of the furnace
is sound without sagging cracks,
gaps, etc. around the base.
5. There are no obvious signs of dete-
rioration of the furnace.
6. The pilot and burner flames are in
good adjustment (by comparison
with pictorial sketches or drawings
of the main burner flame and, if
applicable, the pilot burner flame).
STARTING AND
SHUTTING DOWN YOUR
FURNACE
Should the gas supply fail to shut off or
if overheating occurs, shut off the gas
valve to the furnace before shutting off
the electrical supply. Instead of a con-
tinuously burning pilot flame which
wastes valuable energy, your furnace
uses an automatic, hot surface ignition
system to light the burners each time
the thermostat starts your furnace.
Fol-
low these important safeguards:
5
• Never attempt to light the burners
manually with a match or other source
of flame.
• Read and follow the operating
instructions on the inside of main fur-
nace door, especially the item that
reads as follows:
!
WARNING
Fire Hazard! Failure to keep in-
sulation clear of furnace could
result in fire, personal injury/
death or property damage.
WARNING
Do not keep combustible ma-
terials, gasoline, and other
flammable liquids or vapors
around your furnace. Failure
to follow this warning could
result in fire, personal injury/
death or property damage.
WARNING
For proper and safe operation
the furnace needs air for com-
bustion and ventilation. Do not
block or obstruct the openings
on the furnace, air openings to
the area in which the furnace is
installed, and the space around
the furnace. Failure to follow
this warning could result in fire,
personal injury/death or prop-
erty damage.
!
!
!
Summary of Contents for 345MAV
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