Page 4
<RXUIXUQDFHLVDJDVDSSOLDQFHIt 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 
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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 
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places) has the potential to produce carbon monoxide 
gas. Because of this, /HQQR[UHFRPPHQGVWKHXVHRI
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\RXGRQRWRZQJDVDSSOLDQFHV 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 great-
ly 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. 
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PDLQWHQDQFH RI WKLV DSSOLDQFH Contact your Lennox 
dealer for an inspection by a licensed professional service 
technician (or equivalent).
 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/
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installed in all LP applications. Do not attempt to bleed 
the gas lines of air. Call your local gas provider.
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 WARNING
If you do not follow these instructions exactly, 
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property damage, personal injury or death.
%()25(3/$&,1*7+(81,7,17223(5$7,21smell 
all around the appliance area for gas. Be sure to smell 
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be equipped with a gas control switch. Use only your hand to 
move the 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 repair 
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not attempt to manually light burners on this furnace.
Each time the thermostat calls for heat, the burners will auto-
matically light. The ignitor does not get hot when there is no 
call for heat on units with this ignition system.
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1 -   STOP! Read the safety information at the beginning of 
this section.
2 -   Set the thermostat to the lowest setting.
3 -  7XUQRႇDOOHOHFWULFDOSRZHUWRWKHXQLW
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 -  0RYHVZLWFKRQJDVYDOYHWR2))6HH¿JXUH
7 -  :DLW¿YHPLQXWHVWRFOHDURXWDQ\JDV,I\RXWKHQVPHOO
gas, STOP! Immediately call your gas supplier from a 
neighbor’s phone. Follow the gas supplier’s instructions. 
If you do not smell gas go to next step.
8 -  0RYHVZLWFKRQJDVYDOYHWR216HH¿JXUH
GAS VALVE SHOWN IN ON POSITION
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  Replace the upper access panel.
10 -  Turn on all electrical power to the unit.
11 -  Set the thermostat to desired setting.
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 section 
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professional service technician (or equivalent).
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1 -   Set the thermostat to the lowest setting.
2 -  7XUQRႇDOOHOHFWULFDOSRZHUWRWKHXQLWLIVHUYLFHLVWR
be performed.
3 -   Remove the upper access panel.
4 -   Move switch on gas valve OFF.
5 -   Replace the upper access panel.