US PATENT SUBCLASS 431 / 69
.~ Shutdown by sensed absence of flame in proving period

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
69.~ Shutdown by sensed absence of flame in proving period {2}
70  DF  .~.~> Recycle through proving period on sensing of failure of established flame
71  DF  .~.~> Igniter cut off when flame establishment proved

DEFINITION

Classification: 431/69

(under subclass 18) Apparatus including a "shutdown" device for a burner actuated at the expiration of a period established by a timer or retarder means; the start of the means being correlated with the movement of a demand controller to "start" position; and a flame responsive control effective to prevent "shutdown" by the device if flame is sensed within the period.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15, for means indicating a shutdown or aborted start attempt.

27, for a control providing repeated start attempts prior to shutdown upon failure to establish combustion.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

471, for an automatic or time delay control means responsive to thermal conditions, and subclass 480 for a similar control responsive to radiant energy, in which an electric motor is the ultimate and sole electrical device controlled.