Groen DHS-40, Руководство оператора

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14 OM-DHS
Sequence of Operation
The following “action-reaction” outline is provided to help understand how the kettle works.
1. When the power switch is turned on, it starts the spark igniter and opens the automatic valve for the pilot burner. The spark
ignites a pilot flame, which heats the sensor. The sensor then sends a signal to turn off the spark. The flame thereafter acts as
a standing pilot until the power is turned off.
2. If the pilot flame is not sensed within 90 seconds after spark begins, a timer shuts down the entire operation. To attempt a
second trial for ignition, turn off the power switch. Check the gas supply valves and wait 5 minutes before trying again by
switching power on. If you cannot establish a pilot flame in four tries, close all valves, turn off the power, and contact an
authorized Groen Service Agency.
3. When the operator sets a temperature on the controller, it causes the automatic valve to admit gas to the main burner, where
it is ignited by the pilot flame. When the kettle reaches the set temperature, the switch opens. This stops the signal to the gas
control valve and shuts off gas to the main burner. The pilot flame remains lit. When the kettle cools below the set temperature,
the switch closes and starts another cycle. On and off cycling continues and maintains the kettle at the desired temperature.
This action is indicated by the Heat indicator light.
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.