US PATENT SUBCLASS 431 / 50
.~.~ Sensing of flame at both burners required for continued operation of second 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}
50.~.~ Sensing of flame at both burners required for continued operation of second burner

DEFINITION

Classification: 431/50

(under subclass 42) Apparatus in which: (1) the sensed failure of flame at either burner during operation will result in the cut off of fuel to the second burner; or (2) the presence of a flame at both burners must be indicated at least momentarily in the starting procedure to prevent cut off of the second burner.