US 12,298,038 B2
Feedback warning system using inducer pulse width modulation signal
Madhuka Manuranga Jayarathne, Wichita, KS (US); Andrew Michael Boyd, Wichita, KS (US); Theresa N. Gillette, Wichita, KS (US); and Thomas D. Chase, Wichita, KS (US)
Assigned to Johnson Controls Light Commercial IP GmbH, Neuhausen am Rheinfall (CH)
Filed by Tyco Fire & Security GmbH, Neuhausen am Rheinfall (CH)
Filed on Oct. 9, 2023, as Appl. No. 18/378,089.
Application 18/378,089 is a continuation of application No. 16/569,353, filed on Sep. 12, 2019, granted, now 11,781,785.
Claims priority of provisional application 62/817,857, filed on Mar. 13, 2019.
Prior Publication US 2024/0035705 A1, Feb. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F24H 15/112 (2022.01); F23N 3/08 (2006.01); F24D 19/10 (2006.01); F24F 11/30 (2018.01); F24H 15/20 (2022.01); F24H 15/242 (2022.01); F24H 15/254 (2022.01); F24H 15/35 (2022.01); F24H 15/36 (2022.01); F24H 15/395 (2022.01); F24H 15/421 (2022.01); F24H 15/45 (2022.01)
CPC F24H 15/112 (2022.01) [F24D 19/1084 (2013.01); F24F 11/30 (2018.01); F24H 15/20 (2022.01); F24H 15/242 (2022.01); F24H 15/35 (2022.01); F24H 15/395 (2022.01); F23N 3/082 (2013.01); F23N 2223/08 (2020.01); F24H 15/254 (2022.01); F24H 15/36 (2022.01); F24H 15/421 (2022.01); F24H 15/45 (2022.01); G05B 2219/2614 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller for a heating, ventilation, and air conditioning (HVAC) system, comprising:
one or more processors; and
memory storing instructions thereon that, when executed by the one or more processors, cause the one or more processors to:
initiate a burner and an inducer motor of the HVAC system to provide a combustion airflow through a tube of a heat exchanger;
establish an initial pulse width modulation (PWM) signal sent to the inducer motor as a baseline PWM signal, wherein the baseline PWM signal corresponds to a predetermined airflow pressure of the combustion airflow;
send a PWM signal to the inducer motor associated with a monitored output airflow pressure of the combustion airflow;
compare the PWM signal to the baseline PWM signal in response to the monitored output airflow pressure of the combustion airflow reaching the predetermined airflow pressure of the combustion airflow; and
control the inducer motor based on a comparison of the PWM signal and the baseline PWM signal.