The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 1984
Filed:
Jun. 20, 1979
Phillip J Cade, Winchester, MA (US);
Electronics Corporation of America, Cambridge, MA (US);
Abstract
A burner control apparatus for use with a furnace installation that has an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in the monitored combustion chamber, one or more devices for control of ignition and relay fuel flow, and a modulator controlling air and fuel flow to a main burner for varying heat output. The burner control apparatus comprises a lockout relay for shutting down the furnace, a control device for actuating the ignition and fuel control devices, and a timing circuit that provides several successive and partially overlapping timing intervals of precise relation, including a purge interval, a pilot ignition interval, and a main fuel ignition interval. The present invention includes circuitry for providing a purge interval with the modulator at a high air flow setting. After the purge interval, pilot flame ignition is prevented until the modulator has been moved to a low fire position. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace including particularly a fuel valve end switch, an air flow switch, and modulator position switches.