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| Vehicular internal air exhausting device |
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| Dutch oven type cooking vessel with combination cooking surface |
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| System for cooking dried food stuff |
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| Oscillatory food warming apparatus |
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| Cherry pitter |
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| Vacuum seasoning device |
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Direct ignition system for gas appliance with DC power source
| Details |
Inventors: Rudich, Jr., George; Matthews, Russell B.;
Assignee: Johnson Controls, Inc. (Milwaukee, WI)
Primary Examiner: Dority, Jr.; Carroll B.
Assistant Examiner:
Attorney, Agent or Firm: Emrich, Root, Lee, Brown & Hill
An ignition system for use with a source of dc (or full-wave-rectified) power without the need for an inverter includes a flame sensing relay and a checking relay interlocked to achieve lockout if the proper starting sequence or timing are not met or if a flame-out occurs during operation. The checking relay is energized in response to a call-for-heat signal to isolate the flame detection circuitry from its source and commence a trial-for-ignition period in the flame detection circuitry which includes a timing circuit. The timing circuit actuates the flame-sensing relay during the trial-for-ignition period. The flame sensing relay energizes the fuel valve and a spark generator to ignite the fuel. If a flame is detected during the trial-for-ignition period by a flame probe, the timing circuit is disabled and operation continues until the call for heat is terminated as long as the flame is sensed. Another circuit senses flame at the spark gap and disables the spark gap generator after a flame is established. If a flame-out or fuel interruption occurs, the spark generator is re-energized, and the timing circuit is enabled to commence a re-ignition timing period, after which the flame relay is disabled and the system is locked out if ignition is not proved. Once locked out, the system can be re-started only by cycling the thermostat or a remote switch. A minimum re-cycle time is defined by a charging circuit connected to the timing circuit when either switch is re-cycled. |
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DETAILED DESCRIPTION Referring then to the drawing, reference numeral 10 designates a source of dc electrical power, such as a 12 v.
battery as is commonly used in recreational vehicles or the like.
Power is fed to a conventional thermostat 11 which includes a set of contacts for generating a call-for-heat signal on a line 12.
The signal is coupled through a diode D2 to three principal branches of the circuit.
One branch, generally designated 14 includes the coil of a checking relay K2 and a remote (reset) switch 15.
This switch may be located at any convenient location according to the application--for example, in the case of a water heater where the thermostat is not in a convenient location, switch 15 may be located on a wall.
If the thermostat is convenient, switch 15 is not needed.
A second branch generally designated 16 includes a lockout indicator 17 which may be an incandescent lamp or a Light Emitting Diode if it is desired to conserve power.
The third branch is generally designated 18, and it includes a spark generator generally designated 20 which is enabled by a first enabling circuit 21.
This branch of the circuit also includes a spark gap 22.
The spark gap 22 comprises a pair of electrodes set apart at a predetermined distance to define the gap.
The electrodes are assembled to a burner to be supplied with gas in a manner such that the gas will pass through the gap and be ignited when a spark is generated between the electrodes.
The electrode remains in the flame after the gas is ignited and continues to burn.
Spark gaps of this type are well known in the industry.
Turning now to the right side of the circuit diagram, dc power is coupled through relay contacts to be described to Flame Detection Circuitry 24 which includes the following circuits: (1) an initiation timing circuit generally designated 25; (2) a trial-for-ignition timing circuit 26; (3) a flame sensing circuit 27 which includes a flame probe 28; (4) a second enabling circuit 30; (5) a drive circuit 31; (6) the coil of a flame sensing relay K1; and (7) a re-cycle timing circuit generally designated 32
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Cooking 
