F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/19
F23N 1/00 (2006.01)
Patent
CA 1119694
Abstract of the Disclosure A burner control apparatus includes a timing circuit for providing two successive timing intervals of precise duration, one being a pre-ignition timing interval and the other being an ignition timing interval. The timing circuit includes a capacitor the charging rate of which determines one of the timing intervals and the discharge rate of which determines the other timing interval. In response to a call for burner operation a blower is energized to purge the burner of potentially explosive gases during the pre-ignition timing interval. When the pre-ignition interval comes to an end relays are energized to energize a pilot fuel control and an ignition control. If a flame is sensed during the ignition interval a further relay is energized closing the ignition control and switching over from pilot to main fuel control. If no flame is sensed during this interval a lockout actuator shuts down the entire burner and energizes an alarm. If after establishment of normal burner operation the flame goes out, the cycle of two successive timing intervals is repeated. The flame sensor and lockout actuator are connected directly to a power supply so that power is applied to the flame sensor and lockout circuitry independently of a request for burner operation but the control circuitry for initiating an ignition sequence is energized only after a request for burner operation.
372075
Electronics Corporation Of America
Smart & Biggar
LandOfFree
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