Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1977-01-24
1978-09-26
Favors, Edward G.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 26, F23H 500
Patent
active
041166132
ABSTRACT:
A control circuit for a fuel ignition system of the direct ignition type for providing an interlock on start-up to prevent the energization of a fuel supply valve of the system under certain failure conditions includes an interlock relay which is energized, after a predetermined delay, over normally closed contacts of a flame relay to control a timing network to cause a flame sensing circuit to enable the flame relay to energize the valve during a trial for ignition interval defined by the timing network, the flame sensing circuit maintaining the flame relay, and thus the valve, energized when a flame is provided during the trial for ignition interval, the energization of the valve and the interlock relay being prevented if the normally closed contacts of the flame relay are open on start-up, and the delayed operation of the interlock relay preventing lockout of the system following momentary loss of power.
REFERENCES:
patent: 3830619 (1974-08-01), Cade
patent: 3832123 (1974-08-01), Walbridge
patent: 3847533 (1974-11-01), Riordan
patent: 3892981 (1975-07-01), Bauer
patent: 3941553 (1976-03-01), Bedford
Favors Edward G.
Johnson Controls Inc.
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