Marley Primus P11, User Manual

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Mechanical Equipment:
Always shut off electrical power to the tower fan motor prior to
performing any maintenance on the tower. Any electrical switches
should be locked out and tagged out to prevent others from turning
the power back on.
1. Spin the fan manually to assure that all fan blades properly clear the
inside of the fan cylinder. On belt-drive models observe the action of
the sheaves and belt(s) to be sure that the motor is properly aligned
with the fan sheave. If necessary, correct the alignment. See the
Maintenance section for belt tensioning and sheave alignment—
pages 30 and 31.
2. Momentarily energize (“bump”) the motor and observe rotation of the
fan. The fan should rotate in a counterclockwise direction when viewed
from above. 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 rotation
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.
3. Run the motor and observe the operation of the mechanical equipment.
Operation should be stable.
4. After the first 30 minute run check motor amps and voltage with full
water and heat load. Refer to motor manual.
5 . After 10 to 60 hours of operation check the torque on the fan and motor
sheave bushings and check belt tension on belt-drive models. Refer
to the Maintenance section of this manual for torque values and belt
tensioning instructions—pages 30 and 31.
Operation
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Warning
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Caution
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