Installation Guide

FAN TROUBLE-SHOOTING CHART
PROBLEM POSSIBLE CAUSES
Excessive Vibration Propeller, wheel or sheaves loose on shaft
Belts loose or too tight
Out of balance propeller
Excessive buildup of dirt/dust on propeller
Bent shaft
Weak mounting base for fan
Fan mounting bolts loose
Loose or worn bearings
Bearing or drive misalignment
Mismatched belts
Structures not crossbraced (wall fans)
Curb not at and level
Excessive Horsepower Static pressure higher than design
Wheel or propeller rotating in wrong direction
Fan speed higher than design
Too Little Air Restricted fan inlet or outlet
Filters are dirty or clogged
Wheel or propeller rotating in the wrong direction
System is more restrictive (more static pressure) than expected
Fan speed lower than design
Inlet or Outlet screens clogged
Too Much Air Filters not in place
Fan speed higher than design
System is less restrictive (less static pressure) than expected
Fan Does Not Operate Wrong voltage
Electricity turned off or note wired properly
Loose pulleys
Blown fuses
Overload protector has broken circuit
Broken belts
Excessive Noise Propeller, wheel or sheaves loose
Bearing or drive misalignment
Accumulation of material on propeller
Worn or corroded propeller
Wheel or propeller out of balance
Wheel or propeller hitting housing
Bent shaft
Defective or bad bearings
Bearings need lubrication
Loose bearing bolts
Loose or worn bearings
Mismatched belts
Belts too loose or too tight
Belts oily or dirty
Belts worn
Loose fan mounting bolts
Rattle of components in high velocity airstream
Electrical noise
Noise from high velocity air system
Vibrating parts not isolated from building
Vibrating duct work
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