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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, stopping 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. 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 operation thermostat dial to "OFF" shuts down all control and heating circuits.
The kettle has the following safety features in addition to the 90-second ignition timer:
1.
Low water cutoff relay that will shut off gas supplies to all burners until the jacket
water level is corrected.
2.
High limit pressure switch, set to open at about 46 PSI and to shut down the burners
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 burners when the kettle is tilted.
5.
Gas pressure regulator built into the gas control valve.
OM-40ES-KLT
11
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