Aaon Packaged Rooftop Unit RN-025

Ensure all necessary materials are available

Prepare the cleaning solution with weak acid (5% phosphoric or oxalic acid)

Pump the cleaning liquid through the heat exchanger

Rinse the heat exchanger with clean water

Circulate a solution of 1-2% sodium hydroxide or sodium bicarbonate through the heat exchanger

Perform a final rinse with clean water to ensure all acid is neutralized

Suction Filter Removal Instructions

Shut down operation of the unit

Close both shut-off valves to isolate the suction filter

Reclaim the refrigerant from the suction filter section

Remove the bolts from the suction filter end plate

Remove the pleated filter assembly

Replace the suction filter end plate and bolts

Evacuate the suction filter assembly to 300 microns

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

Select the cleaning products to be used

Use low pressure water or compressed air to clean the coils.

Ensure no harsh chemicals, household bleach, or acid cleaners are used.

Perform a clean water rinse for coils in coastal or industrial environments.

Document the cleaning process to maintain coating warranty coverage.

Gain access to the aluminum energy recovery wheel

Remove the energy recovery wheel from the unit

Remove small foreign materials using one of the following methods

Use compressed air at a distance of at least 0.08 m (2 ft) from the wheel

Use water at a distance of at least 0.08 m (2 ft) from the wheel

Ensure temperature is below 25°C (77°F)

Set unit controls to cooling mode of operation with supply fans on

Is the fan operating in the correct direction?

Is the compressor operating correctly?

Is the compressor rotating correctly?