Tyco Fire + Security Gmbh

Johnson Controls Tyco IP Holdings Llp

Theresa Thy Nguyen Gillette

Andrew Michael Boyd

Mason Sloan Dewald

D Gamage Methmini Umayangana Maheshwari Sumanasekara

A heating, ventilation, and/or air conditioning (HVAC) system includes auxiliary control circuitry configured to communicatively couple to a thermostat of the HVAC system. The auxiliary control circuitry is configured to receive a control signal from the thermostat and block subsequent transmission of the control signal in response to receipt of data indicative of a detected refrigerant external to a refrigerant circuit of the HVAC system.

Refrigerant detection system with auxiliary control circuitry

A heating, ventilation, and/or air conditioning (HVAC) system includes a conditioning system configured to condition a return air flow directed through the HVAC system and a control system configured to determine a difference value between an operating parameter value of the return air flow and a sensed operating parameter value of a space serviced by the HVAC system, retrieve a stored target operating parameter value of the space, and operate the HVAC system based on the difference value, the stored target operating parameter value, or both.

Systems and methods for operating an HVAC system

A heating, ventilation, and/or air conditioning (HVAC) system includes secondary control circuitry configured to communicatively couple to primary control circuitry of the HVAC system that is configured to operate the HVAC system in a variable operating mode. The secondary control circuitry is configured to cause operation of the HVAC system in a calibration mode to determine a calibrated target temperature and transmit the calibrated target temperature to the primary control circuitry to enable operation of the HVAC system in the variable operating mode via the primary control circuitry based on the calibrated target temperature.

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Wichita, KS, United States of America

Theresa Thy Nguyen Gillette