SERVICE TIP

Rotary Blowers

General Safety Notes

• Lock out – tag out when service is being performed.
• Rotating parts including shaft and v-belt drives must be properly guarded to prevent personal injury.
• Electrical wiring must be accomplished by a qualified electrician in accordance with all applicable codes.

1. Do not run fan above its safe speed.
2. Do not operate in dangerous environments.
3. Read all instructions carefully.

• When unit is received, inspect for missing or damaged parts.
• Even though all units are factory inspected, rough handling enroute may cause concealed damage or cause nuts, set screws, bolts or locking collars to work loose. Be sure all fasteners are tightened securely.
• Rotate wheel by hand to verify that it rotates freely and there are not obstructions.
  

• Handle your equipment with care. Some fans are provided with lifting lugs or holes for easy handling, others must be handled with nylon straps or well padded chains and cable to protect the fans coating and housing.
• Spreader bars should be used when lifting large parts.
• Do not lift centrifugal fans by the fan shaft, wheel, flanges or inlet support.
  

General Maintenance

• Inspect all fasteners and retighten if necessary.
• Inspection doors should be tight and sealed.
• Turn rotating assembly by hand to insure that it does not strike housing. If the wheel strikes the housing, the wheel may be moved on the shaft or the bearings may have shifted in transit. Correction must be made prior to start up.
• Check the motor to insure proper speed and electrical characteristics.
• Check v-belt drive for alignment and correct belt tension.
• After wiring, energize the motor 1 second to check for proper rotation.

• The key to good fan maintenance is a regular and systematic inspection of all fan parts.
• Severity of the application should determine frequency of inspection.
• The components requiring service are generally the moving parts which include bearings, fan wheel, belts, sheaves and motor.
• In a severe dirty operation, the wheel should be cleaned with a wire brush to prevent an accumulation of foreign matter that could result in fan unbalance.
• After cleaning wheel, inspect for possible cracks or excessive wear, which can cause unbalance.
• DO NOT OPERATE a wheel that is cracked, chipped, has broken blades or excessive wear.
• If wheel has set screws that have loosened and / or wheel is removed from shaft, set screws must be replaced. Set screws cannot be used more than once.

Posted 8 October 2001