Combustion control device

Details Combustion control device Combustion control device

2005-09-13

2005-09-13

Basichas, Alfred (Department: 3749)

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

C431S067000, C431S072000, C431S073000

Reexamination Certificate

active

06942482

ABSTRACT:
A safety circuit31, which compulsorily closes an on-off valve for supplying a gas to a burner when a microcomputer for performing a combustion control is in an abnormal condition, does not operate unless abnormality occurs to the microcomputer1, and therefore even when the safety circuit31is out of order, an ignition operation is performed as it is. A transistor4is not turned off until a fixed time elapses from a start of an ignition sequence in the safety circuit31, but the fixed time is shortened by a timer acceleration circuit32, and if the transistor4is turned off by a transistor2being turned on, the safety circuit31is determined as normal, so that the normal ignition sequence is executed thereafter.

REFERENCES:
patent: 4190414 (1980-02-01), Elmy
patent: 4375950 (1983-03-01), Durley, III
patent: 5094259 (1992-03-01), Hsu
patent: 5722823 (1998-03-01), Hodgkiss
patent: 6666676 (2003-12-01), Rodriguez-Rodriguez et al.

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