# US 11,906,192 B2 · Heating, ventilation, and air conditioning control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,192 B2 - Document ID: US11906192B2 - Status: Granted - Kind: B2 - Application number: 16/953,122 - Filed: 2020-11-19 - Published: 2021-05-13 - Granted: 2024-02-20 - Earliest claimed: 2017-02-15 - Assignees: Johnson Controls Tyco IP Holdings LLP - Applicants: Johnson Controls Technology Company - Inventors: Stephen C. Wilson - Web page: https://patentgrep.com/patent/US11906192B2 ## CPC - F24F 11/873: by controlling refrigerant heaters - F24F 11/32: Responding to malfunctions or emergencies - G01J 5/0044: {Furnaces, ovens, kilns (G01J5/0007, G01J5/004 take precedence)} - G05B 19/042: using digital processors (G05B19/05 takes precedence) - G08B 21/182: {Level alarms, e.g. alarms responsive to variables exceeding a threshold} - F24F 2110/30: Velocity - F24F 2110/40: Pressure, e.g. wind pressure - F24F 2140/20: Heat-exchange fluid temperature - G05B 2219/2614: HVAC, heating, ventillation, climate control - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract A heating, ventilation, and air conditioning (HVAC) system. The HVAC system includes a sensor that detects a temperature of a heater of a heating component and emits a signal indicative of the temperature. A flow management device controls a flow of electricity or fuel from a power source to the heating component. A controller receives the signal from the sensor and operates the flow management device to block the flow of electricity or fuel to the heating component when the signal is indicative of the temperature being above a set point. ## Claims ### Claim 1 A controller of a heating, ventilation, and air conditioning (HVAC) system, wherein the controller is configured to: receive a signal indicative of an amount of airflow through a heating component of the HVAC system from a sensor of the HVAC system; compare the signal indicative of the amount of airflow to a threshold; and operate a flow management device to block a flow of electricity or fuel to the heating component based on comparison of the signal indicative of the amount of airflow to the threshold. ### Claim 2 (depends on 1) The controller of claim 1, wherein the controller is configured to receive, from a temperature sensor of the HVAC system, a temperature of the heating component. ### Claim 3 (depends on 2) The controller of claim 2, wherein the controller is configured to operate the flow management device to block the flow of electricity or fuel to the heating component based on the temperature exceeding a temperature threshold. ### Claim 4 (depends on 3) The controller of claim 3, wherein the temperature threshold is related to a reaction temperature of a refrigerant of the HVAC system. ### Claim 5 (depends on 4) The controller of claim 4, wherein the refrigerant is an A2L refrigerant. ### Claim 6 (depends on 2) The controller of claim 2, wherein the temperature sensor is an infrared sensor, and the flow management device is a switch configured to block the flow of electricity or fuel to the heating component. ### Claim 7 (depends on 1) The controller of claim 1, wherein the sensor is a flowrate sensor or a pressure sensor. ### Claim 8 (depends on 7) The controller of claim 7, wherein the controller is configured to operate the flow management device to block the flow of electricity or fuel to the heating component based on the amount of airflow falling below the threshold. ### Claim 9 (depends on 1) The controller of claim 1, wherein the sensor is disposed at an inlet or an outlet of a furnace of the HVAC system, and wherein the furnace comprises the heating component. ### Claim 10 (depends on 1) The controller of claim 1, wherein the controller is configured to output a second signal to actuate the flow management device to block the flow of electricity or fuel to the heating component. ### Claim 11 A heating, ventilation, and air conditioning (HVAC) system, comprising: a heating component configured to heat an airflow directed through the HVAC system; a sensor configured to detect an operating parameter of the airflow directed through the HVAC system and to emit a signal indicative of the operating parameter of the airflow; a switch or valve configured to limit a flow of electricity or fuel to the heating component; and a controller configured to: receive the signal indicative of the operating parameter of the airflow; compare the signal indicative of the operating parameter of the airflow to a threshold value; and actuate the switch or valve to limit the flow of the electricity or fuel to the heating component based on comparison of the signal indicative of the operating parameter of the airflow to the threshold value, wherein the operating parameter is an amount of the airflow directed through the HVAC system. ### Claim 12 (depends on 11) The HVAC system of claim 11, wherein the sensor is a flowrate sensor or a pressure sensor. ### Claim 13 (depends on 11) The HVAC system of claim 11, wherein the sensor is a first sensor, and the HVAC system comprises a second sensor communicatively coupled to the controller and configured to detect an additional operating parameter indicative of a temperature of the heating component. ### Claim 14 (depends on 13) The HVAC system of claim 13, wherein the controller is configured to actuate the switch or valve to limit the flow of the electricity or fuel to the heating component based on the additional operating parameter indicative of the temperature of the heating component. ### Claim 15 (depends on 14) The HVAC system of claim 14, wherein the threshold value is a first threshold value, and the controller is configured to: compare the additional operating parameter indicative of the temperature to a second threshold value, wherein the second threshold value is related to a reaction temperature of a refrigerant of the HVAC system; and actuate the switch or valve to limit the flow of the electricity or fuel to the heating component based on comparison of the additional operating parameter indicative of the temperature to the second threshold value. ### Claim 16 A controller for a heating, ventilation, and air conditioning (HVAC) system, wherein the controller is configured to perform operations comprising: receiving, via a sensor, a first signal indicative of a temperature of a heating component of a furnace system of the HVAC system, wherein the heating component is configured to heat an airflow; comparing the first signal indicative of the temperature an to a threshold value; and outputting a second signal to actuate a flow management device of the furnace system to block flow of electricity or fuel to the heating component of the furnace system based on comparison of the temperature to the threshold value. ### Claim 17 (depends on 16) The controller of claim 16, wherein the sensor is an infrared sensor. ### Claim 18 (depends on 16) The controller of claim 16, wherein the operations comprise: receiving, via an additional sensor, a third signal indicative of an amount of the airflow directed through the furnace system; and outputting the second signal to actuate the flow management device of the furnace system to block the flow of electricity or fuel to the heating component of the furnace system based on an additional comparison of the third signal indicative of the amount of the airflow to an additional threshold value. ### Claim 19 (depends on 16) The controller of claim 16, wherein the controller is configured to execute processor executable instructions to perform the operations. ### Claim 20 (depends on 16) The controller of claim 16, wherein the operations comprise: receiving, via an additional sensor, a third signal indicative of a presence of refrigerant of the HVAC system within the furnace system; and outputting the second signal to actuate the flow management device of the furnace system to block the flow of electricity or fuel to the heating component of the furnace system based on the third signal.