US PATENT SUBCLASS 431 / 70
.~.~ Recycle through proving period on sensing of failure of established flame

Current as of: June, 1999
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431 /   HD   COMBUSTION

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

DEFINITION

Classification: 431/70

(under subclass 69) Apparatus in which a sensing of flame failure, after the sensing of flame establishment has prevented. "Shutdown", acts to initiate a restart attempt to be terminated by flame establishment or "shutdown".