US 12,135,136 B2
Systems and methods for leak detection and management in heating, ventilating, and air conditioning (HVAC) systems
Daniel R. Hjortland, Milwaukee, WI (US); and Daniel R. Rumler, New Berlin, WI (US)
Assigned to TYCO FIRE & SECURITY GMBH, Neuhausen am Rheinfall (CH)
Filed by Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed on Jul. 20, 2023, as Appl. No. 18/224,433.
Application 18/224,433 is a continuation of application No. 17/371,879, filed on Jul. 9, 2021, granted, now 11,739,962.
Prior Publication US 2023/0358426 A1, Nov. 9, 2023
Int. Cl. F24F 11/36 (2018.01); F24F 11/61 (2018.01); F24F 11/63 (2018.01); F24F 11/77 (2018.01); F24F 11/88 (2018.01); F24F 5/00 (2006.01); F24F 11/00 (2018.01)
CPC F24F 11/36 (2018.01) [F24F 11/61 (2018.01); F24F 11/63 (2018.01); F24F 11/77 (2018.01); F24F 11/88 (2018.01); F24F 5/00 (2013.01); F24F 11/00 (2013.01); G05B 2219/2614 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A heating, ventilation, and/or air conditioning (HVAC) control system comprising:
control circuitry; and
memory storing instructions executable by the control circuitry to cause the control circuitry to:
send, via the control circuitry, a first command to activate one or more fans in response determining a refrigerant leak is present based on a sensor signal received from a refrigerant sensor;
subsequent to activation of the one or more fans, determine that the refrigerant leak is no longer present based on a change in the sensor signal received from the refrigerant sensor;
initiate a counter in response to determining that the refrigerant leak is no longer present; and
in response to the counter indicating that a set period of time has passed, send a second command via the control circuitry to the one or more fans to return to the one or more fans to normal operation.