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Retrieving diagnostic information from an HVAC component

  • US 7,174,239 B2
  • Filed: 11/19/2004
  • Issued: 02/06/2007
  • Est. Priority Date: 11/19/2004
  • Status: Active Grant
First Claim
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1. A controller for controlling the operation of at least one component in a climate control system, the controller comprising:

  • a first low voltage power supply for the controller, which may be connected to an external alternating current power source;

    a plug-in connection which may be connected to a second external low voltage power supply to the controller;

    a processor that receives power from either the first low voltage power supply connected to an external alternating current power source, or from a second external low voltage power supply connected to the plug-in connection, wherein the processor is capable of detecting the absence of a connection to an external alternating current power source when receiving power from a second external low voltage power supply that is connected to the plug-in connection, and responsively communicates information relating to the operating condition of the controller or at least one component of the climate control system to a display device.

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