Aaon Packaged Rooftop Unit RN-014

Terminate electrical power to the unit

Ensure gas supply to the unit is within specified pressures

Spray soap solution leak detector at each threaded connection of the gas supply piping

Observe each connection for bubbles indicating leaks

Inspect joints with bubbles for thread engagement and/or damage and tighten as needed

Rinse piping thoroughly after leak test to prevent corrosion

Set unit controls to cooling mode of operation with supply fans on

Is the fan operating in the correct direction?

Is the compressor operating correctly?

Is the compressor rotating correctly?

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)

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 on both upper sides of the profiles

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

Inspect all flue product carrying areas of the furnace and main burners for continued safe operation.

Check all gas piping connections for leaks.

Ensure all gas supply lines have been purged of air before turning on the electrical power switch.

Turn the gas valve to the on position.

Turn the main electrical power on and set the controls to the heating mode of operation.

Did the combustion ventilation motor enable?