Patent ID: 7290502
Filing Date: 2007-11-06
Classification: F22D,F23M,F23N,F24H

Abstract:
1. A control for a gas-fired water heater appliance having a flame arrestor in the air inlet to a burner, the appliance comprising: a pressure switch that closes to complete a circuit in the control when sensing a predetermined level of airflow sufficient for maintaining proper burner operation, wherein the level of air flow sufficient for maintaining proper burner operation produces less than 0.04 percent of carbon monoxide in the flue gases; a water temperature sensor; and a processor connected to the water temperature sensor and connectable to the burner for controlling the operation of the burner for heating the water in the tank to a desired temperature, the processor being further connected to the pressure switch to receive a communication from the pressure switch indicating a burner shut down resulting from an insufficient level of airflow, wherein the processor discontinues burner operation after the occurrence of a predetermined number of shut downs before the water is heated to the desired temperature, in which shut downs the burner is shut down within a predetermined time of initiating burner operation as a result of an open pressure switch.