Combustion – Timer – programmer – retarder or condition responsive control – By combustion destructible element – e.g. – fusible plug – etc.
Patent
1975-10-14
1977-07-12
Favors, Edward G.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion destructible element, e.g., fusible plug, etc.
431 22, 137 66, F23N 524
Patent
active
040351343
ABSTRACT:
An automatic fuel ignition system which provides automatic detection of a leak condition for a pilot valve which is operable to supply fuel to a pilot burner for ignition to establish pilot flame and a main valve which is operable to supply fuel to a main burner for ignition by the pilot flame of the system including a control circuit operable in response to a request signal to activate the system tentatively, a delay circuit which delays the operation of the pilot valve for a first delay period after the occurrence of the request signal, a flame sensing circuit which senses the presence of the pilot flame and effects operation of the main valve after a second delay period established by the control circuit, the flame sensing circuit being responsive to the presence of a flame at the pilot burner during the first delay period or at the main burner during the second delay period to cause the system to be deactivated.
REFERENCES:
patent: 3273019 (1966-09-01), Matthews
patent: 3488131 (1970-01-01), Myers et al.
patent: 3840322 (1974-10-01), Cade
patent: 3947220 (1976-03-01), Dietz
Charvat Robert J.
Favors Edward G.
Johnson Controls Inc.
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