Lennox SL280UH090V36B Installation Instructions Manual page 47

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, rollout switches,
primary limit switch and make-up box then
disconnect them.
3 - Disconnect gas supply piping. Remove the screw
securing the burner box cover and remove cover.
Remove the four screws securing the burner
manifold assembly to the vestibule panel and
remove theassembly from the unit.
Sensor
SL280UHV BURNER ASSEMBLY AND REMOVAL
4 - To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually
inspect inside the burners and crossovers for any
blockage caused by foreign matter. Remove any
blockage. Figure 38 shows burner detail.
5 - Reinstall burner box, manifold assembly and burner
box cover.
6 - Re-install gas supply and turn on electrical pwer to
furnace.
Ignitor
Rolllout Switches
Manifold And Gas Valve
Burner Detail Front View
Cross Over
FIGURE 38
Page 47
Retention Rings