Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1976-12-27
1978-02-28
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 46, F23N 524
Patent
active
040764877
ABSTRACT:
A fail-safe, self-checking ignition and control system for a gas burning apparatus having a pilot burner which is initially ignited by electric ignition means upon a need for operation of the apparatus and which in turn ignites a main burner after a flame is established at the pilot burner, the gas flow to the pilot burner being through a first valve and the gas flow to the main burner being through a second valve receiving its gas supply from the first valve. Energization of the ignition means and the two valves is controlled by circuit means of the system including a time delay device, two relays, and solid state flame detecting means. Each time the system is initially energized upon a need for operation of the gas burning apparatus, it tests the critical components of the system and acts to prevent operation of the apparatus if the failure of any such critical component is detected. In the absence of such a failure, the ignition and control system effects energization of the first valve and the ignition means and, subsequently, upon the establishment of a flame at the pilot burner, effects energization of the second valve. If the gas issuing from the pilot burner fails to ignite within a predetermined time period after initial energization of the first valve, the time delay device terminates the energization of the first valve.
REFERENCES:
patent: 3082814 (1963-03-01), Pinckaers
patent: 3376099 (1968-04-01), Giuffrida et al.
patent: 3482922 (1969-12-01), Blackett
Dority Jr. Carroll B.
Essex Group Inc.
Freiburger Lawrence E.
Sommer Robert D.
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