Aaon Packaged Rooftop Unit RNA-025-C-0-4-KAFB-00A

Is the fan at normal operating temperature?

Add grease to purge the seals (do not over-lubricate)

Have the seals been purged of excess grease?

Ensure pressure washer or compressed air is set to a very low pressure to prevent fin and/or coil damages.

Avoid using harsh chemicals, household bleach, or acid cleaners on e-coated coils.

Select the approved coil cleaner used

Clean the coil with the selected approved coil cleaner according to the manufacturer's directions.

Use the approved chloride remover to remove soluble salts and revitalize the unit.

Inspect the coil for any visible damage or residue after cleaning.

Inspection of Purge Sector Condition

Check the condition of the purge sector

Verify the rigidness of the purge sector

Use compressed air to clean the purge sector if required

Measure the distance of the sector against the recovery wheel matrix

Is the distance within the acceptable range?

Check the condition of the seals

Are the seals tight and in good visual condition?

Ensure non-contact seals are not flipped, rolled, or pierced

If seals are damaged, describe the issue and contact technical support

Obtain access to the pulley side bearing access plate

Remove two bearing access plate retaining screws and the access plate

Loosen set screw in bearing locking collar using hexagonal wrench

Tap collar in the direction of wheel rotation to unlock collar using light hammer and drift

Remove two nuts securing bearing housing to the bearing support beam using socket wrench with extension

Was the bearing removable by hand?