Mode Select. With the pump running, you can select the AUTO position or the Maintained (manual cooling) position with the Mode Select switch. Select AUTO mode to energize the controller, permitting it to monitor and control the process. The switch automatically returns to the Center Default position when in AUTO mode. The switch stays in the Maintained position in Manual Cooling mode.
Caution! Always let the pump run for at least one (1) minute before switching to AUTO mode.
Never switch to AUTO mode when filling or venting the unit, except as described in the Unit Startup. Improper switching can seriously damage the heater, as it could become energized with air in the system.
Alarm Silence. Press the ALARM SILENCE button to silence the audible alarm on the console.
Caution! After you silence the alarm, make sure you locate and correct the alarm condition before continuing with unit operation.
Identifying System Status Board Indicators
The system status board is located next to the controller panel. It displays indicator lights to show current operation status, letting you analyze system performance.
Figure 5: System Status Board Indicators
Use the status board to optimize unit performance. For example, if you observe a rapid cycling of the Heater and Cool Solenoid indicators, the unit is operating with a process inefficiency; see the Troubleshooting section for more information.
What follows is a description of system status board indicators.
Upright Portable Hot Oil TCUs | Chapter 4: Operation | 26 |