Lennox Cooling Unit LCH036

Ensure the unit is not in operation before starting the filter replacement.

Verify the correct filter size from table 32.

Remove the temporary filters from the unit

Install the approved filters according to local codes or appropriate jurisdiction

Are the new filters installed correctly and securely?

Spray the coil steadily and uniformly from top to bottom with water

Ensure water pressure does not exceed 900 psi

Ensure spray angle does not exceed 45 degrees

Ensure nozzle is at least 12 inches from the coil face

Check for fractures between the fins and refrigerant tubes

Reduce pressure and work cautiously to prevent damage

Clean condenser coil with detergent or commercial coil cleaner

Shut off power supply and gas to unit

Remove the mullion on the right side of the heat section

Disconnect pressure switch air tubing from combustion air inducer port

Remove and retain screws securing combustion air inducer to flue box

Clean inducer wheel blades with a small brush

Turn off electrical power to the unit

Turn off gas supply to the unit

Remove screws securing burners to burner support

Lift the burners from the orifices and clean as necessary

Inspect the condition of the all-aluminum coils

Is there any visible debris on the all-aluminum coils?

Clean the all-aluminum coils if debris is present

Inspect the condition of the fin/tube coils

Is there any visible debris on the fin/tube coils?

Clean the fin/tube coils if debris is present