公开(公告)号：US12098867B1

公开(公告)日：2024-09-24

申请号：US17555711

申请日：2021-12-20

申请人： A. O. SMITH CORPORATION

发明人： Brian Branecky

IPC分类号： F24H15/36 ,  F24H1/00 ,  F24H9/20 ,  F24H15/238 ,  F24H15/31 ,  F24H15/421

CPC分类号： F24H15/36 ,  F24H1/0027 ,  F24H9/2035 ,  F24H15/238 ,  F24H15/31 ,  F24H15/421

摘要： A water heating system includes a burner and a gas valve fluidly connected to the burner to deliver a flow of combustible gas thereto. The gas valve has an adjustable throttle for the flow of combustible gas, along with a motor to adjust a position of the throttle. A controller is configured to determine a throttle position corresponding to a target air-fuel ratio of the burner during a calibration sequence, and to control the motor in order to operate the burner at that target air-fuel ratio throttle position during a start sequence. The controller is configured to monitor a characteristic of the burner during the start sequence, and to initiate the calibration sequence if the monitored characteristic exceeds an error threshold.