Aaon Packaged Rooftop Unit RNA-040-D-0-3-HAAD-00A

Ensure all necessary equipment is available

Prepare a 5% phosphoric acid or 5% oxalic acid solution in the tank

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

Is the cleaning solution being circulated in a back-flush mode?

Rinse the heat exchanger with clean water

Circulate a 1-2% sodium hydroxide or sodium bicarbonate solution before the last rinse

Is the fan at normal operating temperature?

Select the grease used for lubrication

Ensure the unit is turned off before starting

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

Select the appropriate chemical cleaner

Ensure water pressure does not exceed 689.5 kpa (100 psi)

Maintain a minimum distance of 15.25 centimeters (6 inches) from the coils while cleaning

Is the water aimed perpendicular to the coils?

Notes on the inspection warning

Inspection of Flue Product Carrying Areas

Inspect all flue product carrying areas of the furnace

Inspect main burners for safe operation

Is the furnace safe for continued operation?

Inspect the belt for any visible wear or damage

Is the belt free from visible wear or damage?

Measure the current belt tension

Is the belt tension within the recommended range?

Does the belt require tension adjustment?

Adjust the belt tension if necessary