Groen DEES-40, Руководство оператора

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OM-DEES 13
Sequence of Operation
The following “action-reaction” outline is provided to help the user understand how the equipment works.
When the operator starts up the kettle by turning the power switch “ON” and heat knob 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 heating elements.
When the temperature of the steam jacket reaches the value corresponding to the heat 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 controller senses that the kettle is cooling below the set point, the control relay 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 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 power switch dial to “OFF” shuts down all control and heating circuits.
The kettle has the following safety features:
1. Low water cutoff relay that will remove power from control and contactors until the jacket water level is corrected.
2. High limit pressure switch, set to open at about 46 PSI and to shut down the heat until jacket pressure is decreased.
3. Pressure relief valve, which will release steam if jacket pressure exceeds 50 PSI.
4. Tilt switch, which shuts off all heat when the kettle is tilted.