Issue:
This document describes what to look for in an legacy airflow unit if you discover a loud noise or squealing noise.

Product line:
Airflow, AFX, CCT, CM, TC.

Environment:
All Product models, all serial numbers.

Cause:
Possible fan or motor bearing noise.

Resolution:
Loud noises or squealing coming from unit is usually indicative of a fan issue.

• Bearings need to be check for proper lubrication.
• Blower wheel and housing need to be checked for alignment.
• Fan belt and motor pulley. Check for worn belt or dirty and grease on the pulley.
• Check for cracks in the motor adjustment plate.
• Ensure that the motor is secure to the motor adjustment plate.
• Verify motor amperage to the nameplate (overheating).
• NOTE: most bearings are a sealed cartridge style which need to be replaced, pillow block bearings should be greased accordingly.

Released for:Schneider Electric Nigeria