Sterlco SEU Series Economical Water TCU - Manual (Page 32)

WTR1-600 Chapter 5: Operation 32 of 42
kPa/1.10 bars) for the best cooling capacity and to prevent water boiling in the
process circuit at high temperatures, particularly at the pump suction.
• After venting, the microprocessor controller monitors the TO PROCESS probe,
cycling open the cooling/vent valve to discharge warm water or energizing the
immersion heater to maintain the process set temperature.
5-5 Checking Motor Rotation Direction
Check for correct pump rotation direction by looking at the end of the motor. Press the ON/OFF
switch from the OFF ( O ) position to the ON ( | ) button, and note the direction that the motor
turns. Rotation should be clockwise when viewed from the motor end.
Make sure that a qualified electrician performs the following steps.
To change rotation direction:
•
Disconnect and lock out power at the fused disconnect.
•
Reverse any two incoming leads at the power terminal blocks.
•
Do not switch leads at the motor or motor starters.
5-5 Shutting Down the Temperature Control Unit
Cool the unit down by selecting a set point of zero (
0
). Let the unit stabilize at one temperature
close to the incoming water temperature, then press the STOP button. Now press the VENT
button to relieve any remaining pressure in the system.