Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1976-05-10
1978-05-02
Sprague, Kenneth W.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 43, 431 59, F23Q 908
Patent
active
040872300
ABSTRACT:
A control arrangement for a fuel ignition system including redundant pilot and main valves, includes a thermal heat sensor mounted on a heat exchanger or in an exhaust stack of main burner apparatus and having a heating element which is energized in response to operation of thermostatically controlled contacts to close associated contacts to effect energization of the pilot valve permitting fuel to be supplied to a pilot outlet and the main valve which is operated when a pilot flame is established, the heating element being deenergized when the main valve is operated and the heat sensor being responsive to heat from the main burner to maintain the contacts closed maintaining the pilot valve energized. The heat sensor responds to a flame out condition to deenergize the pilot valve, thereby interrupting fuel flow to main valve.
REFERENCES:
patent: 1596836 (1926-08-01), Hoff
patent: 2722977 (1955-11-01), Hotchkiss
patent: 3376099 (1968-04-01), Giuffrida et al.
patent: 3902839 (1975-09-01), Matthews
Johnson Controls Inc.
Jones Larry
Sprague Kenneth W.
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