Pressure sensing device in gas furnace and method for controlling operation thereof

摘要

Pressure sensing device in a gas furnace including a first tube in communication with a position of an air supply pipe on an inlet side of an air supply fan having a pressure identical to an inlet of the air supply fan, a second tube in communication with a position of an air supply pipe on an outlet side of the air supply fan having a pressure identical to an outlet of the air supply fan, and a pressure difference sensing means respectively connected to the first and second tubes for providing an electric signal according to a pressure difference caused by pressure on the first and the second tubes, thereby detecting clogging states both of the air supply pipe and the exhaust gas pipe, and method for controlling operation of a gas furnace, including the steps of (1) a pressure difference sensing device providing an electric signal according to a pressure difference between inlet/outlet of an air supply fan during operation or a pre-purge step for starting operation, (2) comparing the electric signal to a preset signal at the controller, and (3) either stopping the operation or continuing a normal operation according to a pressure state detected in the comparing step.