Patent ID: 7252502
Filing Date: 2007-08-07
Classification: F23N,G05D,Y10T

Abstract:
1. An apparatus comprising: a first pilot valve in fluid communication with a gas inlet and a pilot burner; a second pilot valve in fluid communication with the gas inlet and the pilot burner; a selectable input device that is manually operable to select a temperature setting and that can open the first pilot valve to allow gas flow from the gas inlet through the first pilot valve to the pilot burner and that can close the first pilot valve to oppose gas flow from the gas inlet through the first pilot valve to the pilot burner; one or more thermal detection devices in thermal communication with the pilot burner, the one or more thermal detection devices being able to output a variable voltage potential upon being heated; and a controller that can receive the variable output voltage potential from the one or more thermal detection devices and that can use the variable output voltage potential to power an electric servo operator pilot valve that can open the second pilot valve when the controller supplies power to it and that can close the second pilot valve when the controller stops supplying power to it, and wherein when open the second pilot valve can maintain gas flow from the gas inlet through the second pilot valve to the pilot burner; and wherein the only voltage potential needed to power the controller can be supplied by the one or more thermal detection devices.