After 24 hours of operation under load, the following services
should be performed:
1. Examine the unit for any unusual noise or vibration.
2. Readjust fan belt tension if required.
It is imperative that maintenance personnel conduct a
thorough start-up before running the unit after a prolonged
shutdown.
At minimum, the following checks must be preformed:
1. Clean any debris from guards, fans, eliminators, heat
transfer coils, and lters.
2. Turn the fan(s) by hand to ensure rotation without
obstruction.
3. Verify and, if necessary, adjust the fan belt tension. (See
section)
4. Prior to start-up, lubricate the fan shaft and motor
bearings. The ball bearings are factory lubricated, but should
be relubricated if the unit has been sitting on site for more
than a year before start-up.
5. Check the locking collar on each fan shaft bearing and
tighten if necessary.
6. Verify
the voltage and current of all three legs of the fan
motors. The current should not exceed the rated service factor.
After prolonged shutdowns, the motor insulation should be
checked with a Megger Tester prior to restarting the motors.
7. Start the fan(s) and verify proper rotation as indicated by
sticker on unit.
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