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VI. Troubleshooting Guide
Trouble
Blower Does Not Turn
and there is -
A Humming Sound
No Sound
Blower Turns, but -
Fuse Blows
Overheats or Thermal
Protector Activates
Makes Abnormal Sound
The Spencer Turbine Company 600 Day Hill Road, Windsor, CT 06095-4706 TEL 800-232-4321
18
Possible Cause
– One phase of power line disconnected
– One phase of stator line open
– Bearing(s) defective
– Impeller jammed by foreign material
– Impeller jammed against casing or
side cover
– Rubbing of rotor core and stator core
– Capacitor open (single-phase models)
– Two phases of power line disconnected
– Two phases of stator winding open
– Faulty switch connection
– Fuse blown
– Fuse capacity insufficient, wiring fault
– Short circuit
– Terminals shorted
– Excessive load
– Power source unbalance; possible
voltage drop
– Operating in single-phase condition
– Excessive friction due to defective bearings
– Impeller contaminated by foreign material
– Impeller rubbing against casing or side cover
– Operation at less than minimum rated flow
– Impeller rubbing against casing or side cover
– Impeller rubbed by foreign material
– Bearing(s) defective
– There is a leak or air passages are clogged
– Loose cap screw
Corrective Action
Connect power leads properly
Contact factory
Change defective bearing(s)
Clean impeller
Adjust gap
Contact factory
Change capacitor
Connect power leads properly
Contact factory
Change switch
Change fuse
Inspect wiring
Repair
Improve insulation and check
connections
Increase air flow
Check voltage; phases must be
balanced within 5% and voltage must
be within 10% of rated
Check connections
Replace bearings
Clean impeller
Adjust gap
Increase air flow
Adjust gap
Clean impeller
Replace bearings
Repair or clean
Tighten screw
860-688-8361
FAX 860-688-0098
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