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Thermostat self-test apparatus and method

  • US 4,448,033 A
  • Filed: 03/29/1982
  • Issued: 05/15/1984
  • Est. Priority Date: 03/29/1982
  • Status: Expired due to Fees
First Claim
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1. A method of detecting a fault in the wiring of a thermostat of an air conditioning system wherein the thermostat has a series of outputs which are energized under the appropriate conditions in known patterns to effect operation of the air conditioning system which comprises the steps of:

  • determining which outputs of the thermostat are energized;

    comparing the status of the outputs ascertained by the step of determining with the known pattern of legal thermostat outputs; and

    indicating a fault condition when the step of comparing detects that the outputs ascertained by the step of determining are other than a known pattern.

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