AEC Econo-Cool Chillers - Manual (Page 56)

AEC Water Temperature Control Units Page 55
6-5 Safety Devices
Caution!
Make sure that only qualified electricians test safety devices!
Safety devices should be tested for function every six (6) months. Perform the
following procedures for testing:
Motor Overload
Disconnect main power. Open the electrical enclosure and rotate the manual TEST
button on the motor overload to the tripped position. Close the enclosure and reconnect
main power. Push the
START button. The unit should not start and the Pump
Overload indicator should illuminate.
Press the
RESET button. The unit is now ready for operation.
Pressure Switch
With the unit running, program a set point of 30ºF (-1ºC). Allow the process
temperature to drop under 100ºF (38ºC). When the process temperature reaches that
point, turn off the water supply. The pump should stop and the Low Water Pressure
indicator should illuminate. Turn the water supply on to reset the pressure switch.
Adjusting the Pressure Switch
The pressure switch used in your Economical Series water temperature control unit is
factory set at 16 psig (110.3 kPa/1.1 bars). However, if the process does not require the
unit to operate at 250ºF (121ºC), you can adjust the switch to meet your process needs.
Tools Required
•
Small flat blade screwdriver
•
#2 Phillips head screwdriver