US PATENT SUBCLASS 431 / 48
.~.~ Sensor of second burner controls third 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}
48.~.~ Sensor of second burner controls third burner

DEFINITION

Classification: 431/48

(under subclass 42) Apparatus in which there is a third burner and an additional sensor which controls the third burner in response to a sensed condition of the second burner.