E 2012 Lennox Industries Inc.
Dallas, Texas, USA
EL280DF
SERIES
506897−01
08/2012
GAS FURNACE
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 licensed professional installer (or
equivalent), a service agency, or the gas supplier.
Litho U.S.A.
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly
could result in serious injury, death, or
property damage.
WHAT TO DO IF YOU SMELL GAS:
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any D Do not try to light any appliance.
other appliance.
D Extinguish any open flames.
phone in your building.
D Do not touch any electrical switch; do not use any
Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
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.
08/12
506897−01
*2P0812*
*P506897-01*
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Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the pro-
duction 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.
CAUTION
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at the
disconnect switch.
NOTICE
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the ap-
plication needs must be made by a licensed profes-
sional installer (or equivalent) using factory−speci-
fied and approved parts.
WARNING
Asphyxiation Hazard
The exhaust vent for this furnace must be leak−free
and must be securely connected to the furnace flue
collar at all times.
Safety Instructions
For your safety and to fulfill the terms of the limited
warranty, a licensed professional service technician
(or equivalent) must annually inspect this furnace
and its vent system.
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 ma-
terial may be combustible.
Exposure to carbon monoxide gas can cause personal inju-
ry and even death to all occupants, including pets. Any item
that is powered by, or gives off heat from, a combustion pro-
cess (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.
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 clear-
ances 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 heat-
er), is installed. When return air is drawn from a room,
a negative pressure is created in the room. If a gas ap-
pliance 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.
Your furnace is designed to meet standards set by nation-
al 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 op-
erating environment. It is your responsibility to ensure that
this appliance is maintained.
Proper maintenance is critical for your safety and the sat-
isfactory operation of the product. Lennox strongly rec-
ommends annual inspection and maintenance of this
appliance. Contact your Lennox dealer for an inspection
by a licensed professional service technician.
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.
Page 3
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7 − Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instruc-
tions. If you do not smell gas go to next step.
DANGER
Danger of explosion.
There are circumstances in which odorant used with
LP/propane gas can lose its scent. In case of a leak,
LP/propane gas will settle close to the floor and may
be difficult to smell. An LP/propane leak detector
should be installed in all LP applications.
8 − Move switch on gas valve to ON. Do not force. See
figure 2.
WHITE RODGERS GAS VALVE
Do not attempt to bleed the gas lines of air. Call your
local gas provider.
Start−Up & Operation Information
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
GAS VALVE SHOWN IN OFF POSITION
FIGURE 2
BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
9 − Replace the upper access panel.
10 − Turn on all electrical power to to the unit.
11 − Set the thermostat to desired setting.
The gas valve on the EL280DF is equipped with a gas con-
trol switch. Use only your hand to move the gas control
switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Call a licensed professional
service technician (or equivalent). Force or attempted re-
pair may result in a fire or explosion.
NOTE − When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
12 − If the appliance will not operate, follow the instructions
ꢀTurning Off Gas to the Unit" and call your service tech-
nician or gas supplier.
Turning Off Gas to the Unit
Placing the EL280DF furnace into operation:
®
EL280DF units are equipped with a SureLight ignition
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.
system. Do not attempt to manually light burners on these
furnaces. Each time the thermostat calls for heat, the burn-
ers will automatically light. The ignitor does not get hot
®
when there is no call for heat on units with the SureLight
1 − Set the thermostat to the lowest setting.
ignition system.
2 − Turn off all electrical power to the unit if service is to be
performed.
Operating the Gas Valve (Figures 2)
1 − STOP! Read the safety information at the beginning of
3 − Remove the upper access panel.
this section.
4 − Move switch on gas valve to OFF. Do not force. See
figure 2.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
5 − Replace the access panel.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
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.
5 − Remove the access panel.
6 − Move switch on gas valve to OFF. Do not force. See
figure 2.
Page 4
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Inspect the furnace venting system to make sure it is in
place, physically sound and without holes, corrosion, or
blockage. The vent connector must be correctly posi-
tioned and sloped upward. The vent connector must be
physically sound, without holes or excessive corrosion.
Filters
EL280DF filters are installed external to the unit. Filters
should be inspected monthly. Clean or replace the filters
when necessary to ensure that the furnace operates prop-
erly. Replacement filters must be rated for high velocity air-
Inspect the furnace return air duct connection. The duct
must be sealed to the furnace and it must terminate outside
the space containing the furnace.
TABLE 1
Filter Size
Furnace
Cabinet Width
Inspect the physical support of the furnace to guarantee
that it is sound. The support must not sag and must not
have cracks or gaps around the base of the furnace. There
must be a seal between the furnace base and the support.
Side Return
Bottom Return
14−1/2"
17−1/2"
21"
16 X 25 X 1 (1)
16 X 25 X 1 (1)
16 X 25 X 1 (1)
14 X 25 X 1 (1)
16 X 25 X 1 (1)
20 X 25 X 1 (1)
During a seasonal check, the service technician will in-
spect the indoor blower and the burner flames along with
the venting system.
Maintenance
A licensed professional service technician (or equivalent)
should inspect the complete system each season (heating
and cooling). The following maintenance procedures
should only be conducted by a licensed professional ser-
vice technician (or equivalent). Do not attempt to service
the unit in any way.
Blower
Check blower wheel for any debris and clean it, if neces-
sary. The blower motor is pre−lubricated for extended bear-
ing life. No further lubrication is needed.
WARNING
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal inju-
ry or death.
Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or
property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
When servicing controls, label all wires prior to dis-
connecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
Service Reminder
Call your Lennox service technician if the unit will not oper-
ate. Before calling, always check the following to be sure
service is required.
1 − Check that electrical disconnect switches are ON.
2 − Check room thermostat for proper setting.
3 − Replace any blown fuses or reset circuit breakers.
4 − Gas valve should be ON.
CAUTION
5 − Air filter should not be plugged, which will limit air flow.
6 − Is gas turned on at meter?
To ensure proper operation, a licensed professional
service technician (or equivalent) should check the
burner flame and conduct a combustion analysis
annually.
7 − Is manual main shut−off valve open?
Record the model and serial number of the furnace. These
numbers are on the unit nameplate, which is located below
the burners.
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger and burners for corro-
sion, deterioration, or deposits of debris. Remove any ob-
structions.
Serial Number ________________________________
Model Number ________________________________
Page 5
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Safety Precautions
Planned Service
If you discover any of the following, shut down your
unit, and contact a Lennox dealer for an inspection by
a licensed professional service technician (or equiva-
lent).
You should expect a service technician to check the follow-
ing items during an annual inspection. Power to the unit
must be shut off for the service technician’s safety.
Fresh air grilles and louvers (on the unit and in the room
where the furnace is installed) − Must be open and unob-
structed to provide combustion air.
D If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a problem. For
example, poorly performing burners can produce unfa-
miliar noises.
Burners − Must be inspected for rust, dirt, or signs of water.
D If you smell any unusual odors, your unit may be operat-
ing improperly. For example, units can give off unfamil-
iar odors if components are required to operate in ab-
normal conditions.
Vent pipe − Must be inspected for signs of water, damaged
or sagging pipe, or disconnected joints.
D Look for visible signs of a malfunctioning unit. Examples
include unusual amounts of condensate on windows in-
side your house, visibly burnt components or unusual
dirt or rust accumulations on the vent pipe or in the unit.
Unit appearance − Must be inspected for rust, dirt, signs
of water, burnt or damaged wires, or components.
Blower access door − Must be properly in place and pro-
vide a seal between the return air and the room where the
furnace is installed.
D If you experience headache, nausea, fatigue, or dizzi-
ness, the cause could be exposure to carbon monoxide
gas. This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu−like symp-
toms that are exaggerated at home, but seem to sub-
side while you are away from the house, exposure to
carbon monoxide could be the cause.
Return air duct − Must be properly attached and provide
an air seal to the unit.
Operating performance − Unit must be observed during
operation to monitor proper performance of the unit and the
vent system.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualified service technician as
an investment in your well being.
Combustion gases − Flue products must be analyzed and
compared to the unit specifications.
Problems detected during the inspection may make it nec-
essary to temporarily shut down the furnace until the items
can be repaired or replaced.
WARNING
Do not use this furnace if any part has been under-
water. A flood−damaged furnace is extremely dan-
gerous. Attempts to use the furnace can result in
fire or explosion. Immediately call a licensed pro-
fessional service technician (or equivalent) to in-
spect 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 neces-
sary.
Pay attention to your furnace. Situations can arise be-
tween annual furnace inspections that may result in unsafe
operation. For instance, items innocently stored next to the
furnace may obstruct the combustion air supply. This could
cause incomplete combustion and the production of car-
bon monoxide gas.
Page 6
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Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model
number listed on the CSA International nameplate −− Example: EL280DF110P60C−1. All service must be done by a li-
censed professional installer (or equivalent), a service agency, or the gas supplier.
Cabinet Parts
Main access panel
Heating Parts
Flame Sensor
Blower access panel
Top Cap
Heat exchanger assembly
Gas manifold
Control Panel Parts
Transformer
Combustion air inducer
Gas valve
Integrated control
Door interlock switch
Circuit Breaker
Main burner cluster
Main burner orifices
Pressure switches
Ignitor
Blower Parts
Primary limit control
Secondary limit
Blower wheel
Blower housing
Motor
Flame rollout switch
Motor mounting frame
Blower housing cut−off plate
WARNING
The State of California has determined that this prod-
uct may contain or produce a chemical or chemicals,
in very low doses, which may cause serious illness
or death. It may also cause cancer, birth defects or re-
productive harm.
Page 7
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