Failsafe HVAC control upgrades
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United States of America Patent
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Jan 31, 2012
Grant Date -
Nov 25, 2010
app pub date -
May 22, 2009
filing date -
May 22, 2009
priority date (Note) -
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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.
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