Aaon Packaged Rooftop Unit RN-040

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

Inspection of Fans, Evaporator Coils, and Filters

Inspect the following components

Is the unit located in a coastal or industrial environment?

Perform a clean water rinse on the coils

Describe any issues encountered during coil cleaning

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

Inspect all air filters for condition and cleanliness.

Inspect the Air Seals and Wheel Drive Components

Select the ASHRAE Class of Air for the environment

Clean the energy transfer media

Verify the cleanliness of the energy transfer media

Is the Energy Recovery Wheel operating optimally?

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.

Disconnect power to wheel drive motor

Remove belt from pulley and position temporarily around wheel rim

Loosen set screw in wheel drive pulley using a hex head wrench and remove pulley from motor drive shaft

While supporting weight of drive motor in one hand, loosen and remove (4) mounting bolts

Install replacement motor with hardware kit supplied

Install pulley to dimension as shown and secure set screw to drive shaft

Stretch belt over pulley and engage in groove

Check that all tools are accounted for