US 2025/0067474 A1 · Systems and Methods for Detecting Pressure in a Gas Furnace

Abstract

Systems and methods are provided for gas furnace systems, including a pressure transducer and optionally one or more pressure switches for efficiently achieving multiple operating modes and/or multiple fuel-to-air mixtures. The pressure transducer may determine a pressure setting at the heat exchanger and based on the pressure value may determine an amount to open a gas valve. As pressure transducer is capable of detecting a range of pressures, multiple different operational modes may be achieved by adjusting the opening of the gas valve depending on the detected pressure. The pressure switches may be used to calibrate and/or confirm the accuracy of the pressure transducer. For example, the output of a pressure switch may be compared to an output of a pressure transducer at a given inductor fan setting to determine whether the pressure transducer is accurate and/or calibrated.

Claims20

Dependent claims

A furnace system comprising:

a gas line configured to receive a gas;
a heat exchanger connected to the gas line and comprising a gas valve for restricting flow of the gas and an ignition configured to selectively ignite the gas;
a fan configured to induce airflow across the heat exchanger at a first fan setting;
a pressure transducer configured to generate a transducer signal indicative of a first pressure value at the heat exchanger;
a first pressure switch configured to generate a first switch signal indicative of a second pressure value at the heat exchanger;
a controller configured to receive the transducer signal and the first switch signal,
wherein the controller is configured to compare the transducer signal to the first switch signal when the fan is at the first fan setting to determine that the pressure transducer is calibrated at the first fan setting.

4 more elements

A method for calibrating a gas furnace system, the method comprising:

causing, by a controller, a fan of the furnace system to operate at a first fan setting to generate a first airflow, the furnace system comprising the fan, a heat exchanger having a gas valve connected to a gas line for restricting a flow of gas, a pressure transducer, and a first pressure switch, the first airflow directed across the heat exchanger;
determining a transducer signal generated by the pressure transducer and indicative of a first pressure value at the heat exchanger at the first fan setting and corresponding to the first airflow;
determining a first switch signal generated by the first pressure switch indicative of a second pressure value at the heat exchanger at the first fan setting and corresponding to the first airflow;
determining that the first pressure value is the same as the second pressure value;
and
determining that the pressure transducer is calibrated at the first fan setting based on the first pressure value being the same as the second pressure value.

3 more elements

Dependencies are inferred from the claim text.

Systems and Methods for Detecting Pressure in a Gas Furnace

Life of this patent

Systems and Methods for Detecting Pressure in a Gas Furnace

Life of this patent

Abstract

Claims20