Aaon Packaged Rooftop Unit RN-020

Clean the Energy Recovery Wheel

Polymer Wheel Air Seals Inspection and Adjustment

Inspect the following components

Loosen diameter seal adjusting screws

Back seals away from wheel surface

Rotate wheel clockwise until two opposing spokes are hidden behind the bearing support beam

Use a folded piece of paper as a feeler gauge between the wheel surface and diameter seals

Adjust seals towards wheel surface until slight friction is detected on the feeler gauge

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)

Gain access to the energy recovery wheel

Brush foreign material from the face of the wheel

Prepare a 5% solution of non-acid based coil cleaner or alkaline detergent with warm water

Wash the segments or small wheels in the prepared solution

Ensure solution temperature does not exceed 76.7°C (170°F)

Soak segments in the solution until grease and tar deposits are loosened

Replace filters with the correct size

Ensure arrow on replacement filters points towards the blower

Wear appropriate personal protective equipment (PPE)

Check for presence of moisture and microbial growth

Is there any visible plugging of the drain lines?

Clean the drain pans thoroughly