Lennox SL280DFNV Installation Instructions Manual page 42

Cleaning the Burners
NOTE - Use papers or protective covering in front of the
furnace during cleaning.
1 - Turn off both electrical and gas power supplies to
furnace.
2 - Label the wires from gas valve, thermal switches,
primary limit switch and make-up box then disconnect
them.
3 - Disconnect gas supply piping. Remove the screws
securing the air fuel plenum to the vestibule panel
and
Air Intake Assembly
Burner Removal For Cleaning Or Replacement
Air Gas Plenum
Gas Valve
remove the air intake assembly (can stay intact) / air fuel
plenum assembly from the unit. The air intake assembly
and air fuel plenum can be removed as one component
4- To clean burner, run a vacuum cleaner with a soft
brush attachment over the face of burner. Visually
inspect inside the burner. Remove any blockage.
5- Reinstall air fuel plenum / air intake assembly.
6- Re-install gas supply and turn on electrical power to furnace.
Gasket
(replace)
Figure 29
Page 42
Burner