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Routine Maintenance and Operation
Before taking any corrective action, make certain unit is not capable of operation during repairs.
Avant d'entreprendre toute action corrective, s'assurer que l'appareil ne pourra pas fonctionner durant les
réparations.
Once the unit has been put into operation, a routine maintenance schedule should be set up to accomplish the
following:
1. Lubrication of bearings and motor.
2. Wheel, housing, bolts and set screws on the entire fan should be checked for tightness.
3. Any dirt accumulation on the wheel or in the housing should be removed to prevent unbalance and possible
damage.
4. Inspect fan impeller and housing looking for fatigue, corrosion, or wear.
Fan Operation
All fans should be run every thirty (30) days, or at least "bumped" every thirty days. It is preferred that each fan
is run as this causes all electrical and mechanical components to get up to temperature, displacing any formed
condensation, redistributes load on bearings, and redistributes grease in the bearings (motor and shaft bearings).
When operating conditions of the fan are to be changed (speed, pressure, temperature, etc.), consult
manufacturer to determine if the unit can operate safely at the new condition.
Belt Drive Maintenance
V-belt drives must be checked on a regular basis for wear, tension, alignment and dirt accumulation. Premature
or frequent belt failures can be caused by improper belt tension (either too loose or too tight) or misaligned
sheaves. Abnormally high belt tension or drive misalignment will cause excessive bearing loads and may result in
failure of the fan and/or motor bearings. Conversely, loose belts will cause squealing on start-up, excessive belt
flutter, slippage and overheated sheaves. Either excessively loose or tight belts may cause fan vibration.
When replacing V-belts on multiple groove drives, all belts should be changed to provide uniform drive loading.
Use a set of matched belts whenever possible. Do not pry belts on or off the sheave. Loosen belt tension until
belts can be removed by simply lifting the belts off the sheaves. After replacing belts, ensure that slack in each
belt is on the same side of the drive. Belt dressing should never be used.
Do not install new belts on worn sheaves. If the sheaves have grooves worn
in them, they must be replaced before new belts are installed.
The proper tension for operating a V-belt drive is the lowest tension at which
the belts will not slip at peak load conditions. Belts are adjusted by raising
or lowering the motor pivot plate. For initial tensioning, the proper belt
deflection halfway between sheave centers is 1/64-inch for each inch of belt
span.
For more information about measuring belt tension, refer to Product
Application Guide, FA/127-11, Measuring Belt Tension, found online at
greenheck.com in the library section.
Check belt tension two times during the first 24 hours of operation and periodically thereafter.
16
Universal Single Width Fans
WARNING
AVERTISSEMENT
IMPORTANT
Belt Span
Deflection =
64
Belt Span
®
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