Thermostat responsive to inputs from external devices

• US 7,731,098 B2
• Filed: 08/22/2007
• Issued: 06/08/2010
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Copeland Comfort Control LP (Emerson Electric Company)
• Original Assignee: Emerson Electric Company
• Inventors: Sartain, John R., Butler, William P., Carey, Steven L.
• Primary Examiner(s): JIANG, CHEN WEN
• Application Number:
  US11/843,380
• Publication Number:
  US 20070284452A1
• Time in Patent Office: 1,021 Days
• Field of Search: 621/26, 621/27, 621/29, 621/96, 236/49.3, 236/49.2, 236/15.C, 165/11.1, 165/241, 165/256, 700/278, 700/276
• US Class Current: 236/49.3
• 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 11/38 Failure diagnosis
• CPC Class Codes: F24F 11/39 Monitoring filter performance
• CPC Class Codes: F24F 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/58 using Internet communication
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 11/76 by means responsive to temperature, e.g. bimetal springs
• CPC Class Codes: F24F 11/80 for controlling the temperature of the supplied air
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2110/12 of the outside air
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value

Abstract

A thermostat is provided that receives one or more inputs from at least one heating system of a climate control system, and initiates an appropriate action in response to the input. The thermostat can turn off a heat pump providing substandard heat and responsively turn on a fuel-fired auxiliary furnace. The thermostat may discontinue further operation of the auxiliary furnace upon receiving an operating error signal associated with the auxiliary furnace, and responsively turn on the heat pump to provide for continued heating. The thermostat may also discontinue operation of the fuel-fired furnace and turn on a circulating fan in response to an input signal indicating a furnace high-temperature or a carbon monoxide presence.

Claims

1. A system for controlling the operation of a heat pump and auxiliary heating system, comprising:

a controller for a heat pump having a compressor that is configured to transmit signals indicating that the compressor is inoperable;

an auxiliary heating system having a furnace control; and

a thermostat connected via one or more wires to the controller for the heat pump and connected via one or more wires to the furnace control, for controlling the operation of the heat pump and the auxiliary heating system, wherein the thermostat is configured to respond to input signals from the controller indicating that the compressor of the heat pump is inoperable by discontinuing operation of the heat pump and requesting operation of the auxiliary heating system to initiate auxiliary heating operation, regardless of the outside ambient temperature.

2. The system of claim 1 wherein the controller for the heat pump is capable of detecting a compressor discharge temperature or the compressor motor current above a predetermined threshold, the controller being configured to discontinue compressor operation when a predetermined threshold has been exceeded and to communicate a signal indicating that the compressor is not operating.

3. The system of claim 2 wherein the thermostat is further configured to discontinue sending signals to the controller requesting heating operation upon receiving a signal indicating that the compressor is inoperable or not operating properly, and to communicate signals to the auxiliary heating system.

4. The system of claim 1 wherein the auxiliary heating system is an electric heat source disposed within an indoor air circulator unit.

5. The system of claim 4 further comprising a controller for the indoor air circulator unit that selectively operates the auxiliary heating system upon receiving a signal from the thermostat requesting auxiliary heating operation.

6. A system for controlling the operation of a heat pump and auxiliary heating system, comprising:

a controller for a heat pump having a compressor that is configured to transmit signals indicating that the compressor is inoperable;

an auxiliary heating system having a furnace control; and

a thermostat connected via one or more wires to the controller for the heat pump and connected via one or more wires to the furnace control, for controlling the operation of the heat pump and the auxiliary heating system, wherein the thermostat is configured to respond to input signals from the controller indicating that the compressor of the heat pump is inoperable by discontinuing operation of the heat pump and requesting operation of the auxiliary heating system to initiate auxiliary heating operation, regardless of the outside ambient temperature

further comprising a two-wire network that the controller for the heat pump and thermostat are connected to, wherein the controller for the heat pump is configured to transmit signals at a fixed time period after the last transmission, which fixed time period is unique to the controller for the heat pump, and the thermostat is configured to transmit signals at a fixed time period after the last transmission that is unique to the thermostat.