Lennox Rooftop Unit LGH300H

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

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 the 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?

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

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

Reassemble the unit and replace gaskets

Filter Inspection and Replacement

Check if filters need replacement

Take note of air flow direction marking on filter frame when reinstalling filters

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

Ensure filters are replaced with approved filters before building is occupied

Refer to local codes or appropriate jurisdiction for approved filters

Verify that temporary filters are replaced with approved filters to prevent damage to unit

Notes on filter condition and any actions taken