Lennox Cooling Unit LCH150S

Shut off power supply and gas to unit

Disconnect pressure switch air tubing from combustion air inducer port

Remove screws securing combustion air inducer to flue box and retain them

Clean inducer wheel blades with a small brush

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

Remove combustion air inducer assembly

Remove flue box cover and clean

Inspect the condition of the all-aluminum coils

Clean the all-aluminum coils if necessary

Inspect the condition of the fin/tube coils

Clean the fin/tube coils if necessary

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

Lift the burners from the orifices and clean as necessary

Check the following components for proper condition

Check ignitor spark gap with twist drills or feeler gauges