Apparatus and method for self-test of thermostat

• US 8,950,688 B2
• Filed: 06/16/2011
• Issued: 02/10/2015
• Est. Priority Date: 06/16/2011
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Babich, Thomas S.
• Primary Examiner(s): NORMAN, MARC E
• Application Number:
  US13/161,693
• Publication Number:
  US 20120318879A1
• Time in Patent Office: 1,335 Days
• Field of Search: 236/1.C, 236/51, 236/94, 700/276, 700/277, 340/870.17
• US Class Current: 236/51
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/49 ensuring correct operation, e.g. by trial operation or configuration checks
• CPC Class Codes: F24F 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/56 Remote control
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value

Abstract

An environmental control system includes at least one of a security monitoring system, or a building automation control system. A thermostat coupled to the at least one system, where the thermostat provides feedback as to output signals therefrom to evaluate functioning of the thermostat. The output signals would be coupled to a heating, ventilating and air conditioning system.

Claims

1. An environmental control apparatus comprising:

at least one of a security monitoring system, or a building automation control system; and

a thermostat which monitors temperature in a selected region, and, provides separate heating and cooling output signals, the thermostat is coupled to at least one system, the output signals would be coupled to heating and cooling inputs of a heating, ventilating and air conditioning system and the thermostat includes first and second feedback circuits coupled to the heating and cooling signals to provide feedback at the thermostat and to at least one system that the thermostat is working properly and a respective heating or cooling unit is not responding properly.

2. An apparatus as in claim 1 where the feedback provides information as to functioning of selected components of the thermostat.

3. An apparatus as in claim 2 where the selected components of the thermostat include at least one of electro-mechanical relays, or solid state switches.

4. An apparatus as in claim 1 where at least one system communicates information as to the feedback to a displaced monitoring station.

5. An apparatus as in claim 1 where at least one system includes circuitry to evaluate feedback from the thermostat.

6. An apparatus as in claim 5 where the feedback comprises electrical signals indicative of selected parameters of the output signals.

7. An apparatus as in claim 6 which includes feedback signal generating circuits coupled to electrical signals from the thermostat.

8. An apparatus as in claim 7 where the circuits include at least one of optical isolators, or operational amplifiers.

9. An apparatus as in claim 1 where the circuits include at least one of optical isolators, or operational amplifiers.

10. A regional monitoring system comprising:

one of a residential security system, or a home automation system; and

a thermostat to monitor temperature in a selected region, the thermostat includes a heating control output signal and a cooling control output signal and feedback circuits coupled to each of the output signals to generate feedback signals indicative of the real-time state of the heating control output signal, and the cooling control output signal wherein the feedback signals are coupled by the thermostat to one of the systems.

11. A system as in claim 10 where the thermostat includes an output interface to couple the feedback signals, via one of a wired, or a wireless communication link to at least one of the security system or the automation system.

12. A system as in claim 11 where the circuitry includes at least one of optical isolators, or operational amplifiers.

13. A device to control a heating and air conditioning system comprising:

a wireless thermostat to monitor temperature in a selected region, the thermostat includes at least one of a heating signal output port and a cooling signal output port for at least one of a heating control output signal or a cooling control output signal and at least one feedback circuit coupled to at least one of the output signals to generate feedback signals indicative of the real-time state of the one output signal, and, a bidirectional communications interface coupled at least to the one feedback circuit wherein the feedback signals are coupled from the thermostat via the interface, and the at least one heating or cooling output signal is emitted from the respective port.

14. A device as in claim 13 where the thermostat includes first and second feedback circuits coupled between a respective control output signal and the communications interface.

15. A device as in claim 14 where the feedback circuits each comprise an isolating electrical circuit.

16. A device as in claim 14 where the communications interface provides feedback from the thermostat to at least one separate system that the thermostat is working properly and a respective heating or cooling unit is not responding properly.