US PATENT SUBCLASS 431 / 51
.~.~ Both burners cut off upon sensed extinguishment of first burner

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
42  DF  .~ Sensor of first burner controls second burner, e.g., pilot and main, etc. {8}
51.~.~ Both burners cut off upon sensed extinguishment of first burner {2}
52  DF  .~.~.~> First burner manual reset valve cut off {2}
56  DF  .~.~.~> Having cut-off valve by-pass or additional supply to first burner

DEFINITION

Classification: 431/51

(under subclass 42) Apparatus including means controlling the feed to the first and second burners; the means automatically cutting off the feed to both burners if the flame at the first burner is sensed as being extinguished.