Fan Troubleshooting

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Excessive Vibration and Noise

• Belts too loose - worn or oily belts
• Speed too high
• Damaged or unbalanced wheel
• Bearings need lubrication or replacement
• Fan surge
• Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly

Low Capacity or Pressure

• Poor fan inlet conditions - There should be a straight clear duct at the inlet
• Incorrect direction of rotation - Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
• Improper wheel alignment

Overheated Motor

• Motor improperly wired
• Cooling air diverted or blocked
• Improper inlet clearance
• Incorrect fan RPM
• Incorrect direction of rotation - Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
• Incorrect voltage

Overheated Bearings

• Improper bearing lubrication
• Excessive belt tension

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Related Topics

• Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

Related Documents

• Belt driven Fans - Motor and Fan Speed - Speed of Fan versus Speed of Motor with Belt Drives
• Fan Affinity Laws - Affinity laws can be used to calculate volume capacity, head or power consumption - when speed or rpm, and wheel diameters are changed
• Fan Motors - Starting Torques - A fan motor must be capable not only of driving the fan at operating speed, but also be capable of accelerating the fan wheel to operating speed