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Upright Portable Hot Oil TCUs Chapter 4: Operation 26
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.