Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1989-05-09
1990-09-11
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 25, 431 69, 431 78, 340579, F23N 500
Patent
active
049558064
ABSTRACT:
An integrated electronic control arrangement is disclosed in the illustrative environment of burner such as in a gas-fired furnace. The control incorporates a self-test feature which shuts down the furnace in the event of any one of a number of possible sensed faults. Self-testing occurs automatically before an attempt at ignition and during furnace operation. Proper functioning of the sensor which senses for induced air flow through the burner combustion chamber is tested prior to enabling a fan which causes that induced air flow. Air flow is confirmed by sending to and receiving back from the sensor a sequence of pulses. Should air flow not be sensed during a combustion period, combustion is terminated. A flame sensor is provided for determining the presence of a flame in the combustion chamber. During times when a flame should be present, pulse sequences are sent to and received back from the flame sensor to confirm that a flame is present. When it is known that no flame is present, if sent pulses are received back, a fault has occurred and the system locks out. If, at any time, any pulses are received when none were sent the system also locks out.
REFERENCES:
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patent: 4662838 (1987-05-01), Riordan
patent: 4672324 (1987-06-01), van Kampen
Grunden Michael T.
Mierzwinski Eugene P.
Youtz Stephen E.
Hamilton Standard Controls Inc.
Price Carl D.
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