Sequence Of Operation - Groen TDBC 20C Operator's Manual

Sequence of Operation

The following "action-reaction" outline is provided to help understand how the kettle works.
When the operator starts up the kettle by turning the power switch to "ON" and temperature dial from "OFF" to a desired setting,
the control relay closes. This lights up the heating indicator light and causes the contactors to close, allowing power to flow to the
heating elements. When the temperature of the steam jacket reaches the value corresponding to the dial setting, the control relay
opens. This turns off the heating indicator light and causes the contactors to open, stopping the power to the heaters. As soon as the
control senses that the kettle is cooling below the set point, the switch closes, the heating indicator light comes on, the contactors
close, and the heaters come on again. On-off cycling continues, keeping the kettle at the set temperature. This is why the heating
indicator light cycles on and off during normal operation. Every time the kettle is tilted, the tilt cut-off switch interrupts the power
supply to the heaters, so that the heating elements will not operate while not submerged in the jacket water.
If steam pressure greater than 50 PSI is generated in the jacket, the pressure relief valve will open and relieve the excess pressure.
In the event that the jacket water level gets too low and the heating elements overheat, the high limit control will open and shut off
power to the elements until the kettle cools. Setting the operating power switch to "OFF" shuts down all control and heating circuits.
14 OM-TDB/TDBC