Lennox International Inc. G43UF User Manual
E 2004 Lennox Industries Inc.
Dallas, Texas, USA
504,898M
02/04
G43UF
SERIES
GAS FURNACE
Failure to follow safety warnings exactly could result in serious injury, death,
or property damage.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
02/04
*2P0204*
Litho U.S.A.
WARNING
FIRE OR EXPLOSION HAZARD.
WHAT TO DO IF YOU SMELL GAS:
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Leave the building immediately.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
D If you cannot reach your gas supplier, call
the fire department.
504,898M
*P504898M*
G43UF Parts Identification
TOP CAP
UPPER ACCESS
PANEL
COMBUSTION AIR
PROVING
(PRESSURE)
SWITCH
DURALOK
EXCHANGER
ASSEMBLY
TM
HEAT
BURNERS
CABINET
GAS VALVE AND
MANIFOLD
FLUE
COLLAR
COMBUSTION AIR
INDUCER
INTEGRATED
CONTROL BOARD
BLOWER ACCESS
PANEL
FIGURE 1
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
NOTE − This manual must be left with the equipment
user.
BLOWER
MOTOR
CONTROL BOX
WARNING
Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the furnace before
shutting off electrical supply.
CAUTION
Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at the
disconnect switch.
Page 2
WARNING
Do not use this furnace if any part has been underwater. A flood−damaged furnace is extremely dangerous. Attempts to use the furnace can result in
fire or explosion. Immediately call a qualified service technician to inspect the furnace and to replace
all gas controls, control system parts, and electrical
parts that have been wet or to replace the furnace,
if deemed necessary.
IMPORTANT
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the application needs must be made by a Lennox service
technician using factory specified and approved
parts.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal injury or loss of life. Installation and service must
be performed by a qualified installer, service agency
or the gas supplier.
Safety Instructions
1 − Keep the furnace area clear and free of combustible
material, gasoline, and other flammable vapors and
liquids. If it is installed in an insulated area, the furnace
must be kept free of insulating material. Insulating material may be combustible.
2 − DO NOT obstruct air flow to unit. Unit must receive an
unobstructed flow of combustion and ventilating air.
DO NOT block or obstruct air openings on the furnace
or air openings to the area in which the furnace is
installed. Take care to maintain established clearances surrounding the furnace.
3 − DO NOT store chlorine or fluorine products near unit
or introduce these products into the combustion air.
These products can cause furnace corrosion.
4 − DO NOT draw return air from a room where this fur-
nace, or any other gas appliance (ie., a water heater), is installed. When return air is drawn from a room,
a negative pressure is created in the room. If a gas appliance is operating in a room with negative pressure,
the flue products can be pulled back down the vent
pipe and into the room. This reverse flow of the flue
gas may result in incomplete combustion and the
formation of carbon monoxide gas. This toxic gas
might then be distributed throughout the house by the
furnace duct system.
WARNING
The blower door must be securely in place when the
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
the living space resulting in personal injury or death.
Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the production of carbon monoxide gas. Complete combustion of
the gas requires, but is not limited to, correct gas pressure
and gas flow rate, adequate combustion, air, and proper
venting.
WARNING
Carbon monoxide gas is invisible, odorless and
toxic.
Exposure to carbon monoxide gas can cause personal injury and even death to all occupants, including pets. Any item
that is powered by or gives off heat from a combustion process (including lawn mowers, automobiles, and fireplaces)
has the potential to produce carbon monoxide gas. Because
of this, Lennox recommends the use of a carbon monox-
ide detector in your home, even if you do not own gas
appliances. Reliable detectors are available at reasonable
retail prices. Contact your Lennox dealer for more details
about this investment in your safety.
Your furnace is designed to meet standards set by national agencies, and to operate safely when properly installed
and maintained. However, the unit’s performance can be
greatly impacted by the individual installation and the operating environment. It is your responsibility to ensure that
this appliance is maintained. Proper maintenance is critical for your safety and the satisfactory operation of the
product. Lennox strongly recommends annual in-
spection and maintenance of this appliance. Contact
your Lennox dealer for an inspection by a qualified service
technician.
Lighting Information & Operation
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE LIGHTING the unit, smell all around the ap-
pliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the
floor.
Page 3
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