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Troubleshooting
Problem
Excessive Noise
Low CFM
High CFM
Static Pressure
Wrong
High Horsepower
Fan Doesn't Operate
Overheated Shaft
Bearing
Excessive
Vibration
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor and result in
motor failure. Do not exceed the maximum cataloged RPM of the fan.
NOTE: Always provide the unit model and serial numbers when requesting parts or service information.
Cause
Corrective Action
Adjust wheel.
Wheel rubbing (inlet)
Tighten wheel hub or bearing collars on shaft.
Tighten Sheaves on motor/fan shaft. Adjust belt tension. Align
V-belt drive
sheaves properly (see V-Belt Drives section). Replace worn belts
or sheaves.
Replace defective bearing(s). Lubricate bearings.
Bearings
Tighten collars and fasteners.
Clean all dirt off wheel. Check wheel balance, rebalance if
Wheel unbalance
necessary.
Fan
Check wheel for correct rotation. Increase fan speed.*
Duct system
See page 3.
Fan
Decrease fan speed.
Duct system
Resize ductwork. Access door, filters, grilles not installed.
Duct system
has more or less
Change obstructions in system. Use correction factor to adjust
restriction than
for temperature/altitude. Resize ductwork. Change fan speed.*
anticipated
Fan
Check rotation of wheel. Reduce fan speed.
Resize ductwork. Check proper operation of face and bypass
Duct system
dampers. Check filters and access doors.
Check fuses/circuit breakers. Check for switches turned off or
Electrical supply
disconnected. Check for correct supply voltage.
Drive
Check for broken belts. Tighten loose pulleys.
Assure motor is correct horsepower and not tripping overload
Motor
protector.
Lubrication
Check for excessive or insufficient grease in the bearings.
Replace damaged bearing. Relieve excessive belt tension. Align
Mechanical
bearings. Check for bent shaft.
Adjust tightness of belts. Replacement belts should be a matched
Belts
set.
Check alignment of shaft, motor and pulleys. Check wheel
System unbalance
balance, rebalance if necessary.
Check alignment between coupling, motor and fan shafts.
Coupling
Any adjustments should be made per coupling manufacturer's
misalignment
instructions. Shim only under motor.
11
Model BCSW-FRP
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