Lennox Rooftop Unit LGH048

Ensure all motors are lubricated at the factory

Verify that no further lubrication is required for factory-lubricated motors

Blower Shaft Bearings Lubrication

Check that blower shaft bearings are prelubricated

Is it time for the 2-year lubrication cycle?

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

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

Label all wires prior to disconnection

Ensure all necessary tools and equipment are available

Check and replace filters as necessary

Disconnect controls after labeling wires

Inspect controls for any visible damage

Reconnect controls ensuring proper wiring

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

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