| 摘要 |
The present invention discloses a gas water heating appliance including a housing, a burner, a heat exchanger, an air supply fan, and an air pressure switch. The burner is disposed in the housing to generate heat. The heat exchanger is adapted for absorbing the heat and transferring the heat to water passing therethrough. The air supply fan is disposed in the housing for supplying air to the burner. The air pressure switch has a negative pressure port and a positive pressure port; wherein the negative pressure port is connected to the air supply fan via a first tube, and the positive pressure port is connected to atmosphere via a second tube. Since the pressure exerted by the adverse winds can also be detected at the positive pressure port, the pressure change at the negative pressure port is counterbalanced by the pressure change at the positive port, therefore, the air pressure switch would not be affected by adverse winds, and the misoperation to the appliance caused by adverse winds can be avoided. |
