ALX SERIES
SPUN ALUMINUM EXHAUSTERS
ALX-M-06_27_22
Page 5 of 7
FAN TROUBLESHOOTING
Disconnect and secure to the OFF position all electrical power to the fan prior to inspection or servicing. Failure to comply with this safety
precaution could result in serious injury or death.
1.
Ventilator should be checked at least once a year. For critical or severe applications a routine check every two to three months is
suggested.
2.
Guard to be kept free of debris. Easily installed/removed using the integrated twist lock tabs. Gently twist the guard tab so that it slips
under the support arm to lock in place. Guard is easily removeable for fan servicing and cleaning. No tools are required.
3.
When moving or installing a belt, don’t force the belt over the sheave. Loosen the motor mount so that the belt can be easily slipped
over the sheave.
4.
The belt, on belt driven units, should be removed and carefully checked for cracks, ply separation or irregular wear. A small
irregularity in the contact surface of the belt will result in noisy operation. If any of these defects are apparent the belt should
be replaced. At the same time check the sheaves for chips, dents or rough surfaces that could damage the belt.
5
. The correct belt tension is important. Too tight a belt will result in excess bearing pressure, which can cause premature bearing failure
and may cause the motor to overload. Too loose a belt will result in slippage, which will burn out belts. Proper belt deflection should
be 1/64” (half way between sheave centers) for each inch of belt span when a force of approximately 5 lbs. is applied.
6.
The belt alignment should be checked to be sure that the belt is running perpendicular to the rotating shafts. Motor and drive shafts
must be parallel.
7.
A periodic inspection of all fasteners should be carried out to ensure they have not loosened due to vibration. Particular attention
should be paid to fasteners attaching the wheel to the shaft and those attaching the shaft to the bearing.
MAINTENANCE
WARNING
MA
k
E SURE THE UNIT IS NOT CAPABLE OF OPERATION
DURING REPARATION.
PROBLEM
POSSIBLE ISSUE
SOLUTION
Wheel rubbing inlet
Adjust wheel, loosen set screw(s) and move the wheel, acquiring
clearance between inlet and wheel, then re-tighten set screw(s)
Wheel unbalance
Check wheels for debris or dirt build up and clean when necessary
Object in rotation area or housing
Remove object
Motor compartment loose
Re-tighten the fasteners
Malfunction of electrical supply
Check supply voltage, fuse and switch
Malfunction of motor
Check wiring and overload protector
Motor overload/overheat
Wrong wheel rotation
Re-wire the motor to change direction of rotation
Damper Malfunction
Check opening side of back draft damper, check operation status of
controlled damper
Wrong wheel rotation
Re-wire the motor to change direction of rotation
Improper Duct System
Check obstruction of duct in the duct or dirty filter
Discharge Blockage
Check discharge and remove any debris
Excessive noise/vibration
Fan does not operate
Reduced airflow
