Aaon HVAC Unit RN-031-4-0-CR

Is the fan at normal operating temperature?

Select the grease used for lubrication

Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts

Inspect blower wheels and bands for excessive dust build up

Is there excessive dust build up on any blower wheel or band?

Clean blower wheels and bands if excessive dust is found

Check for any signs of vibration or component failure after cleaning

Describe any issues found during the maintenance

Gather necessary cleaning tools and materials

Inspect the drain pan for any visible debris or blockage

Remove any debris from the drain pan

Clean the drain pan with an appropriate cleaning solution

Is the drain line clear and unobstructed?

Ensure all necessary equipment and materials are available

Prepare a cleaning solution with 5% phosphoric acid or 5% oxalic acid

Pump the cleaning liquid through the heat exchanger

Ensure the cleaning solution flow rate is at least 1.5 times the normal flow rate

Was the cleaning performed in a back-flush mode?

Rinse the heat exchanger with clean water

Check for debris or foreign matter in the vent outlet

Is the vent outlet clear of debris?

Turn the appliance back on if maintenance is complete

Describe any issues found during inspection