Troubleshooting
Problem | Cause | Corrective Action | |
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| Wheel rubbing inlet | Adjust wheel and/or inlet cone. Tighten wheel hub or | |
| bearing collars on shaft. | ||
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| Tighten sheaves on motor/fan shaft. Adjust belt tension. | |
| Align sheaves properly (see procedure). Replace worn | ||
Excessive noise |
| belts or sheaves. | |
| Bearings | Replace defective bearing(s). Lubricate bearings. | |
| Tighten collars and fasteners. | ||
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| Wheel unbalance | Clean all dirt off wheel. Check wheel balance, replace if | |
| necessary. | ||
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| Fan | Check wheel for correct rotation. Check blade position | |
Low CFM | of bypass air plenum (BAP) damper, increase fan speed.* | ||
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| Duct system | Higher pressure than design. Filters need replacement. | |
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| Fan | Decrease fan speed. | |
High CFM |
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Duct system | Increase BAP damper blade open position. Resize | ||
| ductwork. Access door, filters, dampers not installed. | ||
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| Duct system has more | Change obstructions in system. Use correction factor | |
| to adjust for temperature/altitude. Adjust set point used | ||
Static pressure wrong | or less restriction than | ||
to control BAP damper modulation. Resize ductwork. | |||
| anticipated | ||
| Clean filters/coils. Change fan speed.* | ||
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| Fan | Check rotation of wheel. Reduce fan speed. | |
High horsepower |
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Duct system | Resize ductwork. Check proper operation of isolation | ||
| and bypass dampers. Check filters and access doors. | ||
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| Electrical supply | Check fuses/circuit breakers. Check for switches turned | |
| off or disconnected. Check for correct supply voltage. | ||
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Fan doesn’t operate | Drive | Check for broken belts. Tighten loose pulleys. | |
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| Motor | Assure motor is correct horsepower and not tripping | |
| overload protector. | ||
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| Lubrication | Check for excessive or insufficient grease in the bearing. | |
Overheated bearing |
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Mechanical | Replace damaged bearing. Relieve excessive belt | ||
| tension. Align bearings. Check for bent shaft. | ||
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| Belts | Adjust tightness of belts. Replacement belts should be a | |
| matched set. | ||
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Excessive vibration |
| Check alignment of shaft, motor and pulleys. Adjustable | |
| pitch pulleys with motors over 15 hp are especially | ||
| System unbalance | ||
| prone to unbalance. Check wheel balance, rebalance if | ||
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| necessary. | |
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*Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor and result in motor failure. Do not exceed the maximum cataloged rpm of the fan.
Unit Identification
The tag below is an example of an identification label on the fan. The information provides general details about the fan, as well as containing specific information unique to the unit. When contacting your Greenheck representative with future needs or questions, please have the information on this label available.
Tags are mounted in an area which is clearly
®
MODEL S/N
MARK
Model — General description of fan
S/N — Serial Number assigned by Greenheck, which is a unique identifier for every unit
Mark — Customer supplied identification
14
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