US PATENT SUBCLASS 431 / 42
.~ Sensor of first burner controls second burner, e.g., pilot and main, etc.

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
42.~ Sensor of first burner controls second burner, e.g., pilot and main, etc. {8}
43  DF  .~.~> With electrical igniter {4}
48  DF  .~.~> Sensor of second burner controls third burner
49  DF  .~.~> And an igniting burner for first burner
50  DF  .~.~> Sensing of flame at both burners required for continued operation of second burner
51  DF  .~.~> Both burners cut off upon sensed extinguishment of first burner {2}
57  DF  .~.~> Manual reset of second burner required upon first burner extinguishment
58  DF  .~.~> Sensor controls diaphragm motor of second burner valve
59  DF  .~.~> Electrical or magnetic sensor controls second burner

DEFINITION

Classification: 431/42

(under subclass 18) Apparatus in which a means responsive to a condition of one burner head or assembly effects or locks a control means of a second burner head or assembly.

SEE OR SEARCH CLASS

137, Fluid Handling,

65+, for a control subcombination of a burner assembly comprising a combustion failure responsive fuel safety cut off for a burner feed line where the subcombination does not include the flame holder fed by the controlled line.