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US 4,056,348 AGranted
Glow coil ignition system with flame sensing
AssigneeRobertshaw Controls Company
InventorDenis G. Wolfe
Life of this patent
Estimating the term…
Abstract
The heat from an electric resistance igniter is used both (1) to start fuel flow to a burner after ignition temperature, and (2) to stop the fuel flow after a delay in the event of flame failure.
Claims9
A burner ignition system comprising
- fuel flow control means,
- an electrical resistance igniter,
- first means operated by heat from the igniter for opening the fuel flow control means when the igniter is at fuel ignition temperature,
- second means operated by heat from the igniter overriding the operating first igniter temperature operated means for closing the fuel flow control means after a duration of operation of the first igniter temperature responsive means, and
- burner flame sensing means for overriding the operating second igniter heat operated means during the presence of a flame.
2 more elements
Dependencies are inferred from the claim text.