Fan System; Fan Motor Bearings; Fan Shaft Ball Bearings - EVAPCO ATC-E Operation And Maintenance Instruction Manual

System / Condensing Temperature Drops
Decrease the fan speed, as required .
System Off / No Load
The system pump turns off . The starter interlock will energize any optional basin heaters in cold weather .
The recirculation pump should not be used as a means of capacity control, and should not be cycled frequently .
Please see section "Capacity Control" for more informations .
Dry Operation
During colder winter months it is possible to turn off the spray pump, drain the cold water basin, and just cycle the fans . Be sure to
leave the basin drain open during this time to prevent collection of rain water, snow, etc . If the unit has positive closure dampers they
should be fully opened before the fans turn on . If this method will be used on a forced draft unit, be sure to verify that the motor and
drives have been properly sized to handle the reduction in static pressure experienced when the spray water is turned off .
NOTE: MINIMUM CONTROL POINT FOR PROCESS FLUID SHOULD NEVER BE LOWER THAN 6°C .
NOTE: WHEN A UNIT IS PROVIDED WITH A DISCHARGE DAMPER ASSEMBLY, THE CONTROL SEQUENCE SHOULD
CYCLE THE DAMPERS OPEN AND CLOSED ONCE A DAY REGARDLESS OF CAPACITY REQUIRMENTS TO PREVENT THE
ASSEMBLY FROM SEIZING . THE FAN MOTOR SHOULD BE SHUT OFF WHENEVER THE DAMPERS ARE CLOSED .

Fan System

The fan systems of both centrifugal and axial driven units are rugged; however, the fan system must be checked regularly and
lubricated at the proper intervals . The following maintenance schedule is recommended .

Fan Motor Bearings

EVAPCO evaporative cooling units use either a T .E .A .O . (Totally Enclosed Air Over) or a T .E .F .C . (Totally Enclosed Fan Cooled)
fan motor . These motors are built to "Cooling Tower Duty" specifications . The fan motor bearings for motors up to 30 kW are
lubricated for the lifecycle of the bearings, higher motor powers require relubrication (please see motor manual for more detail) . All
fan motors are supplied with special moisture protection on the bearings, shaft and windings . After extended shut-down periods,
the motor should be checked with an insulation tester prior to restarting the motor .

Fan Shaft Ball Bearings

Lubricate the fan shaft bearings every 1,000 hours of operation or every three months for induced draft units . Lubricate the
fan shaft bearings every 2,000 hours of operation or every six months for forced draft units . Use any of the following synthetic
waterproof, inhibited greases which are suitable for operation between -40°C and 120°C . (For colder operating temperatures,
contact the factory) .
Feed grease slowly into the bearings or the seals may be damaged . A hand grease gun is recommended for this process .
When introducing new grease, all grease should be purged from the bearings .
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Operation and Maintenance Instructions
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