Title: Heater safety control system

Abstract: A safety control system for use on a heater which shuts off the heater fuel supply if the heater flame is not present within a predetermined time after initial ignition is attempted or after re-ignition is attempted should the flame be extinguished. A flame sensor which makes use of the electrical conductivity of the flame is employed with a solid-state switch, silicon controlled rectifier, and time delay relay to provide a fast response control circuit for shutting off the fuel supply valve in the absence of flame after a predetermined delay.

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Inventors: Bedford, Robert E. (Canoga Park, CA, US)

Application Number: 518750
Filing Date: 1974-10-29
Publication_date: 1976-03-02
Assignee: Scheu Manufacturing Company (Upland, CA)
Primary Class(es): 431/80
Other Classes:
US Patent Ref:

3630648	Dec, 1971	Hulsman	431/80.
3689194	Sep, 1972	Das et al.	431/80.
3847533	Nov, 1974	Riordam	431/78.

Other Refs:
Primary Examiner: Favors, Edward G.
Assistant Examiner:
Attorney: Fleit & Jacobson