User manual

Improper installation of the fan cylinder and fan guard will destroy the

structural integrity of the fan guard. Failure of the fan guard could allow

operating or maintenance personnel to fall into the rotating fan.

3. Spin the fan(s) manually to assure that all fan blades properly clear the inside of

the fan cylinder. If equipped, observe the action of the coupling (or drive shaft

couplings) to be sure that the motor and Geareducer are properly aligned.

If necessary, correct the alignment in accordance with the included manual.

For belt drive equipped models observe the action of the sheaves and

belts to be sure that the motor is properly aligned with the fan sheave.

See Belt Tensioning and Sheave Alignment on pages 22 thru 24.

It is essential that the fan cylinder and fan guard be installed in ac-

cordance with the drawings shipped with the tower. Do not force

the fan cylinder out of round.

4. Momentarily bump (energize) the motor(s) and observe rotation of the

fan(s). If rotation is backwards, shut off the fan and reverse two of the

three primary leads supplying power to the motor.

Iftowerisequippedwithatwo-speedmotor,checkforproperrota-

tionatbothspeeds.Checkalsotoseethatstarterisequippedwitha

20 second time delay which prevents direct switching from high

speed to low speed. If the fan is intended to be reversed for deicing

purposes,makesurethatthestarterisequippedwitha2minute

time delay between changes of direction. These delays will prevent

abnormalstressfrombeingappliedtothemechanicalequipment

and the electrical circuit components.

5. Run the motor and observe the operation of the mechanical equipment.

Operation should be stable, and, if equipped, there should be no evidence

of oil leakage from the Geareducer.

6. If equipped with belt drive check the torque on the fan and motor sheave after

10 - 60 hrs. of operation. See Bushing Fastener Torque Values on page 25.

If the water supply system is not being operated—or if there is no

heat load on the system—motor amps read at this time may indicate

an apparent overload of as much as 10–20%. This is because of the

increased density of unheated air ﬂowing through the fan. Deter-

mination of an accurate motor load should await the application of

the design heat load.

Caution

Installation

Note

Warning