Aaon Packaged Rooftop Unit RNA-060-D-0-3-FAEJ-00A

Ensure the power to the unit is off and locked out.

Clean the area around the unit to remove leaves, grass, or loose debris.

Remove any grease or oil film with GulfClean™ Coil Cleaner.

Ensure all barriers such as soils, grease, or dirt are removed to allow contact with salts.

Application of GulfClean™ Coil Cleaner

Apply GulfClean™ Coil Cleaner to the interior air exiting side coil surfaces first.

Work in sections/panels moving side to side and from top to bottom.

Ensure all necessary equipment and materials are available

Prepare a cleaning solution with 5% phosphoric acid or 5% oxalic acid

Set the cleaning solution flow rate to at least 1.5 times the normal flow rate

Is the cleaning solution being pumped in a back-flush mode?

Pump the cleaning liquid through the exchanger

Rinse the heat exchanger with clean water

Ensure the unit is turned off before starting

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

Select the appropriate chemical cleaner

Ensure water pressure does not exceed 689.5 kpa (100 psi)

Maintain a minimum distance of 15.25 centimeters (6 inches) from the coils while cleaning

Is the water aimed perpendicular to the coils?

Ensure the machine is powered off and disconnected from the power source

Remove any covers or guards to access the belt

Measure the current belt tension

Is the belt tension within the recommended range?

Adjust the belt tension if necessary

Reinstall any covers or guards removed earlier

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

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