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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 operating thermostat dial from
"OFF" to a desired setting, the thermostat switch 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
dial setting, the thermostat switch opens. This turns off the heating indicator light and
causes the contactors to open, cutting the power to the heaters.
As soon as the thermostat senses that the kettle is cooling below the set point, the
thermostat 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.
If steam pressure greater than 30 PSI is generated in the jacket, the safety valve will
open and relieve the excess pressure.
If the jacket water level gets too low, the high- limit control will open and shut off
power to the elements until the kettle cools. This will prevent the heating elements
from overheating.
Setting the operating thermostat dial to "OFF" shuts down all control and heating
circuits.
10
OM-KLS-E
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