Typical Damper Motor Schematic
For 3 phase, damper motor voltage should be the same between L1
and L2. For single phase application, disregard L3. *Damper motors
may be available in 115, 230 and 460 volt models. The damper motor
nameplate voltage should be verified prior to connection. **A
transformer may be provided in some installations to correct the
damper motor voltage to the specified voltage.
Final Installation Steps
1. Inspect fasteners and setscrews, particularly fan mounting and bearing fasteners, and tighten according to the
recommended torque shown in the table Recommended Torque for Setscrews/Bolts.
2. Inspect for correct voltage with voltmeter.
3. Ensure all accessories are installed.
Recommended Torque for Setscrews/Bolts (IN/LB)
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power sources.
2. Ensure fasteners and setscrews, particularly those used for mounting the fan, are tightened.
3. Inspect belt tension and pulley alignment.
4. Inspect motor wiring.
5. Ensure belt touches only the pulleys.
6. Ensure fan and ductwork are clean and free of debris.
7. Inspect wheel-to-inlet clearance. The correct wheel-to-inlet clearance is critical to proper fan performance.
8. Close and secure all access doors.
9. Restore power to the fan.
Start Up
Turn the fan on. In variable speed units, set the fan to its lowest speed and inspect for the following:
1. Direction of rotation.
2. Excessive
vibration.
3. Unusual
noise.
4. Bearing
noise.
5. Improper belt alignment or tension (listen for squealing).
6. Improper motor amperage or voltage.
If a problem is discovered, immediately shut the fan off. Lock out all electrical power and check for the cause of the
trouble.
See
Troubleshooting.
7
