Combustion – Process of combustion or burner operation – Starting or shutdown procedure
Patent
1993-06-09
1994-09-20
Dority, Carroll B.
Combustion
Process of combustion or burner operation
Starting or shutdown procedure
431 31, 431 46, 431 70, 431 71, F23N 520
Patent
active
053484665
ABSTRACT:
A heat exchanger system, a fuel control system therefor and methods of making the same are provided, the fuel control system having an electrical circuit means that comprises an ignition trial portion, a flame sensing control portion and a timer portion that comprises a counter having a plurality of outputs and a timer that clocks the output of the counter on each discharge of the timer, the timer portion also comprising a capacitor, a trial time resistor and a wait time resistor that are selectively placed in series with the capacitor by the counter when clocked to certain outputs by the timer to determine an ignition trial time period and a wait time period, and a transistor operatively interconnected to the capacitor to discharge the capacitor when flame is sensed by the flame sense portion.
REFERENCES:
patent: 4836770 (1989-06-01), Geary
patent: 4856983 (1989-08-01), Geary
patent: 4971549 (1990-11-01), Geary
patent: 4976605 (1990-12-01), Geary
patent: 5141431 (1992-08-01), Geary
patent: 5209655 (1993-05-01), Geary
Chapter 8, pp. 155-173 of the book, IC Timer Handbook . . . with 100 projects & experiements by Joseph J. Carr (1981).
Dority Carroll B.
Robertshaw Controls Company
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