Proving system for fuel burner blower

摘要

The invention is a fuel burner system including an electrical control circuit for initiating fuel flow to a burner in response to a call-for-heat from a condition responsive sensor, and an electrical ignitor for igniting the fuel emanating from the burner. Combustion or purging air is directed to the burner by a fan, the integrity of which is monitored by a sensor circuit that produces a fault signal in response to rotation of the fan at any speed in a given range of speeds. An inhibit circuit inhibits the control circuit to prevent opening of a fuel supply valve in response to the presence of the fault signal. Fan rotation at speeds either above or below a predetermined normal range indicates a malfunction and results in the fault signal that prevents the initiation of fuel flow and a try for ignition.