Filter
Top Products
11
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. 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. If necessary, correct the alignment in ac-
cordance with the Belt Tensioning and Sheave Alignment section on
pages 21 and 24.
The following steps require operation of the fan motor while the
access door is open. DO NOT view the fan operation from near or
inside the access door location. Fan rotation should be viewed from
tower grade.
The access door should NOT be opened while the fan is operating. The
fan rotation causes a negative pressure inside the cooling tower and
will abruptly pull the door open should access be attempted. Only open
the cooling tower access door when the fan is off and locked out.
2. Momentarily bump (energize) the motor and observe rotation of the
fan. The fan should rotate in a counterclockwise direction when viewed
from below. 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.
Warning
Installation
Warning
Caution
Caution