Over temperature limiting scheme by reducing gas pressure

F - Mech Eng,Light,Heat,Weapons – 23 – N

Patent

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Details

F23N 5/02 (2006.01) F23N 5/26 (2006.01)

Patent

CA 2393156

An apparatus for and method for protecting the electronic circuitry within a gas appliance. The electronic circuitry is arranged on a circuit board. A temperature sensor, located on the circuit board is periodically read to determine the current temperature. If the current temperature exceeds a first predetermined value, a microprocessor commands a stepper motor to reduce the input fuel pressure to the main burner. If the current temperature is within an acceptable range, the microprocessor permits the user to increase main valve outlet pressure.

L'invention concerne un appareil et un procédé permettant de protéger un circuit électronique dans un appareil à gaz. Le circuit électronique est agencé sur une carte de circuit électronique. Un capteur de température, situé sur ladite carte est périodiquement lu de façon à déterminer la température courante. Si la température courante dépasse une première valeur prédéterminée, un microprocesseur commande à un moteur pas à pas de réduire la pression du combustible d'entrée dans le brûleur principal. Si la température courante se situe dans une plage acceptable, le microprocesseur permet à l'utilisateur d'augmenter la pression de sortie de la vanne principale.

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