Patent ID: 7250870
Filing Date: 2007-07-31
Classification: F23N,F24H

Abstract:
1. An alarm assembly adapted for sensing and recording a back drafting event proximate a flue gas opening in an atmospherically vented, combustion heating device, the alarm assembly comprising: an alarm member; a temperature sensor unit adapted for positioning proximate the flue gas opening of the heating device, the temperature sensor unit in electrical communication with the alarm member and activating the alarm member upon sensing an increase in temperature above a predetermined value; a time delay circuit interposed between the temperature sensor unit and the alarm member providing a delay of predetermined duration between the temperature sensor unit sensing an increase in temperature above the predetermined value and activation of the alarm member; a light emitting diode in electrical communication with the alarm member, the diode being lit upon powering of the alarm assembly; a reset switch in electrical communication with the alarm member, the reset switch deactivating the alarm member and resetting the time delay circuit; a test button for momentarily activating the alarm member; and a power source for providing electrical power to the alarm assembly.