COOK SQI - Manual (Page 6)

6
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direc-
tion as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the
inlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direc-
tion as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direc-
tion as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
Wheel-to-Inlet Clearance
The correct wheel-to-inlet
clearance is critical to
proper fan performance.
This clearance should be
verified before initial start-
up since rough handling
during shipment could
cause a shift in fan compo-
nents. Refer to wheel/inlet
drawing for correct overlap.
Adjust the overlap by
loosening the wheel hub
and moving the wheel along
the shaft to obtain the cor-
rect value.
A uniform radial gap
(space between the edge of
the cone and the edge of
the inlet) is obtained by
loosening the inlet cone
bolts and repositioning the inlet cone.
Size Overlap
70 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”