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Troubleshooting
Before taking any corrective action, make certain unit is not capable of operation during repairs.
PROBLEM
Too much airflow Resistance lower than designed
System resistance too high
Reduced airflow
Fan too close to damper
Fan speed too low
Excessive dirt buildup on propeller
Excessive vibration
Defective motor
Excessive noise
Variable frequency drive (VFD)
Debris
1
3
Electrical supply
Fan does not
operate
Motor
1
2
Parts List
Each fan bears a manufacturer's nameplate with model number and serial number embossed. This information
will assist the local representative and the factory in providing service and replacement parts. Before taking any
corrective action, make certain unit is not capable of operation during repairs.
3
4
5
Direct Drive AER-M
3
2
4
®
WARNING
CAUSE
Decrease fan speed.
Check backdraft dampers for proper operation. Remove obstructions in
ductwork. Clean dirty filters. Check for adequate supply air for exhaust
fans or exhaust air for supply fans.
Increase distance between fan and damper.
Increase fan speed.
Clean propeller.
Clean dirt buildup from propeller. Check all setscrews and fasteners for
tightness. Check for worn bearing. Correct propeller imbalance. Check
2
for loose dampers, guards or ductwork.
4
Replace motor.
Check VFD for drive setting, some controllers are able to be adjusted
to lower the harmonic noises sometimes heard during operation by
adjusting a simple setting on the controller.
Exhaust
Airflow
Remove all debris from the fan.
Check fuses/circuit breakers. Check for switches turned off or
disconnected. Check for correct supply voltage.
Assure motor is correct horsepower and not tripping overload protector.
Exhaust
Airflow
1
5
6
7
8
Exhaust
Airflow
CORRECTIVE ACTION
6
Supply
Airflow
5
Supply
Airflow
Supply
Airflow
1. Fan Panel
2. Propeller
3. Venturi Insert
4. Corner Brackets (4)
5. Drive Frame Upper Arm (2)
6. Motor
7. Motor Plate
8. Drive Frame Lower Arm (2)
Sidewall Propeller Fans
7
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