Failsafe HVAC control upgrades
US8108075B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 2009 |
| Grant date | Jan 31, 2012 |
| Priority date | — |
| Expiry date | Apr 22, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B9/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method is presented for providing failsafe control in a control system used for receiving and controlling various object or medium properties in a heating, ventilating or air conditioning system. The control system comprises an HVAC controller, configured to receive failsafe data indicative of a safety related property of an object or medium, and to generate a state indicative of a connection status of a failsafe detector with respect to the HVAC controller. The control system further comprises a non-volatile memory, operably coupled to the HVAC controller and configured to store a connection indication indicative of a connection status of the failsafe detector with respect to the HVAC controller, wherein the HVAC controller is configured to generate a control signal based on satisfaction of a predetermined relationship between the generated state and the stored connection indication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.