Fault-tolerant HVAC system
Patent 5801940 Issued on September 1, 1998. Estimated Expiration Date: 
February 12, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 12, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesThermostat self-test apparatus and method Thermostat control system Method and system for controlling a single zone HVAC supplying multiple zones Service thermostat Automated diagnostic system having temporally coordinated wireless sensors Patent #: 5481481 InventorsAssigneeApplicationNo. 598561 filed on 02/12/1996US Classes:700/9, Supervisory control700/276HVAC controlExaminersPrimary: Ruggiero, JosephAttorney, Agent or FirmInternational ClassG06F 019/00AbstractA fault-tolerant HVAC system capable of continued operation in the event of a thermostat malfunction. An HVAC controller controls the operation of an HVAC unit in accordance with a temperature signal output from the thermostat and indicative of air temperature of a conditioned space proximate the thermostat. The HVAC controller detects a thermostat malfunction and, in response thereto, instead controls the operation of the HVAC unit in accordance with a temperature sensor outputting a signal indicative of return air temperature from the conditioned space.Field of SearchWITH ALARM, INDICATOR, SIGNAL, REGISTER, RECORDER, TEST OR INSPECTION MEANSWITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL Having heating and cooling capability Plural temperature regulators for plural zones Temperature responsive or control Plural temperature sensors WITH TIMING ELEMENT With indicator or alarm | |
