Lennox Rooftop Unit LGH242

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

Label all wires prior to disconnection

Check and replace filters as necessary

Verify proper operation after servicing

Attach proof of service documentation

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 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

Were the filters replaced with approved filters?

Check for any damage to the unit after filter replacement

Ensure all necessary tools and materials are available, including a hand grease gun and lithium base grease (e.g., Alvania 3, Chevron BRB2, or Regal AFB2).

Verify that the motor does not require additional lubrication beyond factory settings.

Check that blower shaft bearings are prelubricated.

Enter the number of units to be lubricated.

Use a hand grease gun to apply lithium base grease to the bearings.

Did a bead of grease appear at the seal lip contacts after lubrication?

Inspect the following components for corrosion, deterioration, or debris deposits

Remove any obstructions or blockages found during inspection

Refer to Figure 5, Figure 6, or Figure 7 for detailed diagrams