Lennox Cooling Unit LGH120H

Turn off electrical power to the unit

Turn off gas supply to the unit

Remove burner compartment access panel

Remove screws securing burners to burner support

Locate the ignitor under the left burners

Remove combustion air inducer assembly

Remove flue box cover and clean

Inspect the condition of the all-aluminum coils

Are the all-aluminum coils free from debris and obstructions?

Inspect the condition of the fin/tube coils

Are the fin/tube coils free from debris and obstructions?

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

Ensure pressure does not exceed 900 psi

Ensure 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

Inspect the evaporator coil for dirt and debris

Clean the coil using mild detergent or commercial coil cleaner

Flush the condensate drain with water

Ensure the following are not wet during flushing

Is the coil clean and free of debris?