Lennox International Inc Furnace SL280DFV User Manual

E 2010 Lennox Industries Inc.  
Dallas, Texas, USA  
506698−01 11−2010  
SL280DFV  
SERIES  
Supersedes 506424−01  
GAS FURNACE  
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:  
D Do not try to light any appliance.  
D Extinguish any open flames.  
Do not store or use gasoline or other flammable  
vapors and liquids in the vicinity of this or any  
other appliance.  
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.  
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.  
11/10  
506698−01  
*2P1110*  
*P506698-01*  
 
WARNING  
Product contains fiberglass wool.  
WARNING  
Improper installation, adjustment, alteration, service  
or maintenance can cause property damage, person-  
al 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.  
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 Cal-  
ifornia to cause cancer.)  
Safety Instructions  
Fiberglass wool may also cause respiratory, skin,  
and eye irritation.  
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.  
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  
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.  
WARNING  
3 − DO NOT store chlorine or fluorine products near unit  
or introduce these products into the combustion air.  
These products can cause furnace corrosion.  
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.  
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.  
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.  
WARNING  
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.  
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 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.  
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  
Carbon monoxide gas is invisible, odorless, and  
toxic.  
Page 3  
 
Placing the SL280DFV furnace into operation:  
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.  
®
SL280DFV units are equipped with a SureLight ignition  
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  
ignition system.  
Operating the Gas Valve (Figures 2 and 3)  
1 − STOP! Read the safety information at the beginning of  
this section.  
2 − Set the thermostat to the lowest setting.  
3 − Turn off all electrical power to the unit.  
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.  
4 − This furnace is equipped with an ignition device which  
automatically lights the burners. Do not try to light the  
burners by hand.  
5 − Remove the upper access panel.  
6 − Move switch on gas valve to OFF. Do not force. See  
figure 2 or 3.  
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.  
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.  
8 − Move switch on gas valve to ON. Do not force. See fig-  
9 − Replace the upper access panel.  
10 − Turn on all electrical power to to the unit.  
11 − Set the thermostat to desired setting.  
DANGER  
Danger of explosion.  
NOTE − When unit is initially started, steps 1 through 11  
may need to be repeated to purge air from gas line.  
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.  
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.  
Do not attempt to bleed the gas lines of air. Call your  
local gas provider.  
WHITE RODGERS GAS VALVE  
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  
HONEYWELL GAS VALVE  
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.  
The gas valve on the SL280DFV is equipped with a gas  
control switch. Use only your hand to turn 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.  
GAS VALVE SHOWN IN ON POSITION  
FIGURE 3  
Page 4  
 
 
Turning Off Gas to the Unit  
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.  
1 − Set the thermostat to the lowest setting.  
2 − Turn off all electrical power to the unit if service is to be  
performed.  
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.  
3 − Remove the upper access panel.  
4 − Move switch on gas valve to OFF. Do not force.  
5 − Replace the access panel.  
Filters  
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.  
SL280DFV 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-  
flow. Table 1 lists recommended filter sizes.  
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.  
TABLE 1  
During a seasonal check, the service technician will in-  
spect the indoor blower and the burner flames along with  
the venting system.  
Filter Size  
Furnace  
Cabinet Width  
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)  
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.  
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.  
WARNING  
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.  
Burner Flame  
WARNING  
ELECTRICAL SHOCK, FIRE,  
OR EXPLOSION HAZARD.  
CAUTION  
To ensure proper operation, a licensed professional  
service technician (or equivalent) should check the  
burner flame and conduct a combustion analysis  
annually.  
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.  
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.  
When servicing controls, label all wires prior to dis-  
connecting. Take care to reconnect wires correctly.  
Verify proper operation after servicing.  
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.  
Venting System  
WARNING  
Asphyxiation Hazard  
5 − Air filter should not be plugged, which will limit air flow.  
6 − Is gas turned on at meter?  
The exhaust vent for this furnace must be leak−free  
and must be securely connected to the furnace flue  
collar at all times.  
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.  
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.  
Serial Number ________________________________  
Model Number ________________________________  
Page 5  
 
 
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.  
Safety Precautions  
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).  
Burners − Must be inspected for rust, dirt, or signs of water.  
Vent pipe − Must be inspected for signs of water, damaged  
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.  
or sagging pipe, or disconnected joints.  
Unit appearance − Must be inspected for rust, dirt, signs  
of water, burnt or damaged wires, or components.  
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.  
Inner blower access panel − Must be properly in place and  
provide a seal between the return air and the room where  
the furnace is installed.  
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.  
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.  
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.  
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.  
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.  
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.  
Planned Service  
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.  
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: SL280DF090V48B−01. All service must be done by a li-  
censed professional installer (or equivalent), a service agency, or the gas supplier.  
Cabinet Parts  
Access panel  
Heating Parts  
Flame Sensor  
Blower access panel  
Top Cap  
Heat exchanger assembly  
Gas manifold  
Combustion air inducer  
Gas valve  
Control Panel Parts  
Transformer  
®
Main burner cluster  
Main burner orifices  
Pressure switches  
Ignitor  
SureLight integrated control  
Door interlock switch  
Circuit Breaker  
Blower Parts  
Primary limit control  
Secondary limit  
Blower wheel  
Motor  
Flame rollout switches  
Blower housing cut−off plate  
Page 6  
 

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