Groen DEE-CE Series, Operator'S Manual

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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 on the power switch and by turning
the operating thermostat dial from “0” to a desired setting, the thermostat switch
closes and the green POWER lamp comes on. This also lights up the amber HEAT
indicator light and causes the contactors to close, allowing power to flow to heating
elements.
When the temperature of the steam jacket reaches the value corresponding to the
dial setting, the thermostat switch opens. This turns off the HEAT indicator light and
causes the contactors to open, stopping the power to the heaters.
As soon as the thermostat senses that the kettle is cooking below the set point, the
thermostat switch closes, the HEAT 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 HEAT 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 345 kPa (50 psi) is generated in the jacket, the safety
valve will open and relieve the excess pressure.
If the jacket water level gets too low before the heating elements overheat, the high-
limit control will open and shut off power to the elements until the kettle cools.
Setting the operating thermostat dial to “0” shuts down the heating circuits. Turning
the power switch to OFF shuts down all heating and control circuits.