Lennox Rooftop Unit LGH094

Turn off the electrical power to the unit

Turn off the gas supply to the unit

Remove the appropriate component based on unit type

Disconnect the pressure switch air tubing from the combustion air inducer port

Remove and retain the screws securing the combustion air inducer to the flue box

Remove and retain screws from the bracket supporting the vent connector

Turn off the electrical power to the unit

Turn off the gas supply to the unit

Remove the burner compartment access panel

Remove screws securing burners to burner support

Lift the entire burner assembly from the orifices

Ensure all necessary tools and materials are available, including a hand grease gun and lithium base grease.

Select the grease to be used for lubrication

Use a hand grease gun for relubrication.

Add grease until a bead appears at the seal lip contacts.

Was a bead of grease visible at the seal lip contacts?

Ensure no excess grease is left around the bearings.

Remove the combustion air inducer assembly as described in the Combustion Air Inducer subsection

Clean the flue box with a wire brush as required

Clean the tubes with a wire brush

Replace gaskets during reassembly

Filter Inspection and Replacement

Check the condition of the filters

Is the air flow direction marking on the filter frame noted?

Replace factory-installed filters if within 30 days of initial unit start-up

Replace temporary filters before building is occupied

Refer to local codes or appropriate jurisdiction for approved filters and note any specific requirements

Were the filters replaced with approved filters?

Check for any damage to the unit after filter replacement