The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 2026
Filed:
Jan. 12, 2024
Lennox Industries Inc., Richardson, TX (US);
Vickey Bhardwaj, Kancheepuram, IN;
Sangameshwaran Sadhasivam, Kanchipuram, IN;
Patric Ananda Balan Thobias, Chennai, IN;
Lennox Industries Inc., Richardson, TX (US);
Abstract
A method for operating an HVAC system includes receiving a first loss of charge parameter and determining that a first refrigerant circuit includes a refrigerant leak based upon a comparison of a loss of charge threshold to the first loss of charge parameter. The method includes operating the HVAC system in a pump down mode in response to determining that the first refrigerant circuit includes the refrigerant leak. During the pump down mode, the method includes closing a first controllable valve configured downstream of a first circuit of condenser coils in the first refrigerant circuit, and wherein closing the first controllable valve causes a refrigerant to vent from a first pressure relief valve if a predetermined pressure threshold is exceeded, and wherein the first pressure relief valve is configured upstream of the first controllable valve and downstream of a first compressor in the first refrigerant circuit.