Aaon Packaged Rooftop Unit RN-006

Wear appropriate personal protective equipment (PPE)

Inspect the drain pans for moisture and microbial growth

Remove any debris from the drain pans

Clean the drain pans with an appropriate cleaning solution

Is the drain line clear and unobstructed?

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

Obtain access to the pulley side bearing access plate if bearing access plates are provided.

Remove two bearing access plate retaining screws and the access plate.

Using hexagonal wrench, loosen set screw in bearing locking collar.

Using light hammer and drift, tap collar in the direction of wheel rotation to unlock collar.

Using socket wrench with extension, remove two nuts which secure bearing housing to the bearing support beam.

Aluminum Wheel Air Seals Inspection

Check the condition of the non-contact sealing on wheel peripheries and brush sealing middle beam

Are the non-contact seals free from being flipped, rolled, or pierced?

Aluminum Wheel Brush Plate Inspection

Inspect the condition of the brushes and their adherence to the wheel matrix surface

Do the brushes require replacement or repositioning?

Adjust the position of the brushes if necessary by unscrewing and repositioning them

Aluminum Wheel Purge Sector Inspection

Check the condition, rigidness, and cleanliness of the purge sectors

Record the entering air temperature

Is the entering air temperature above 3.3°C (38°F)?

Verify compliance with safety requirements

Check the sealing of water piping entries into the unit

Describe any issues found during inspection