Maintenance
WARNING
Disconnect all electrical power to the fan and secure to the ‘OFF’ position prior to inspection or servicing. Failure to comply with this safety precaution could result in serious injury or death.
Once the fan has been put into operation, a periodic maintenance program should be set up to preserve the reliability and performance of the fan. Items to be included in this program are:
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Belts
Premature belt failures are frequently caused by improper belt tension (either too tight or too loose) or misaligned pulleys. The proper tension for operating a
centers is 1/64 inch for each inch of belt span.
For example, if the belt span is 64 inches, the
belt deflection should be
one inch using moderate thumb pressure at
midpoint of the drive.
Check belt tension two times during the first 24 hours of operation and periodically thereafter. To adjust belt tension, simply loosen four fasteners (two on each side of the motor plate) and slide the motor plate away from the fan shaft until proper belt tension is attained. On
some fans, fasteners attaching the motor to the motor | |
plate must be loosened in order to adjust |
|
the belt. |
|
It is very important that the drive |
|
pulleys remain in proper alignment |
|
after adjustments are made. |
|
Misalignment of pulleys will result |
|
in premature belt wear, noise, | Belt |
vibration and power loss. | Alignment |
Fasteners and Set Screws
A periodic inspection should include checking all fasteners and set screws for tightness. Particular attention should be paid to set screws attaching the wheel to the shaft.
Motors
Many fractional horsepower motors installed on the smaller fans are lubricated for life and require no further attention. Motors supplied with grease fittings should be greased according to directions printed on the motor.
Removal of Dust and Dirt
Dirt clogs cooling openings on the motor housing, contaminates bearing lubricant, and collects on the impeller causing severe imbalance if left unchecked. The exterior surface of the motor and impeller should be thoroughly cleaned periodically. Use caution and do not allow water or solvents to enter the motor or bearings. Under no circumstances should motors or bearings be sprayed with steam or water.
Fan Shaft Bearings
The bearings for Greenheck fans are carefully selected to match the maximum load and operating conditions of the specific class, arrangement, and fan size. The instructions provided in this manual and those provided by the bearing manufacturer will minimize any bearing problems. Bearings are the most critical moving part of the fan; therefore, special care is required when mounting them on the unit and maintaining them. Locking collars and set screws, in addition to fasteners attaching the bearing to the bearing plate must be checked for tightness. Greenheck Fan Corporation recommends bearings to be relubricated quarterly at a minimum. All
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monthly rotation of the shaft and purging grease prior to storage and
Laboratory Exhaust System 9
®
