Intermittent pilot type burner control with a single control rel

Details Intermittent pilot type burner control with a single control rel Intermittent pilot type burner control with a single control rel

1990-10-22

1991-06-04

Dority, Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of first burner controls second burner, e.g., pilot...

431 46, 431 54, F23Q 908

Patent

active

050209884

ABSTRACT:
A burner control system for an intermittent pilot burner system uses a single pole double throw relay to control first and second electromagnetic valves respectively supplying fuel for both burners and for the main burner only. The normally open contact pair supplies the current for the first and the normally closed contact pair supplies the current for the second valve. By selecting the valve supplying fuel for both burners to be of the type which has an appreciably higher pull-in current than drop-out current, and by shunting the relay's normally open contacts with a properly selected resistor, only a single relay is necessary. This resistor is selected to supply current sufficient to hold the valve open (current greater than the drop-out value) after the valve has received pull-in current through the closing of these normally open contacts, but insufficient to open the valve. Use of a single relay reduces cost, size, and power, and increases safety of the control system.

REFERENCES:
patent: 3282324 (1966-11-01), Romanelli
patent: 4360338 (1982-11-01), Katchka
patent: 4435150 (1984-03-01), Rippelmeyer
patent: 4689006 (1987-08-01), Gann
patent: 4806095 (1989-02-01), Goldstein et al.

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