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Efficiency heating, ventilating, and air-conditioning through extended run-time control

  • US 9,528,717 B2
  • Filed: 02/28/2012
  • Issued: 12/27/2016
  • Est. Priority Date: 02/28/2012
  • Status: Active Grant
First Claim
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1. An extended run-time device for extending the time that a compressor-based heating, ventilating, and air-conditioning (HVAC) system runs so as to increase energy efficiency of the HVAC system, the extended run-time device comprising:

  • a temperature control device configured to generate a call-for-cool control signal having a first logic state for the duration of a requested compressor run time, the call-for-cool control signal having a second logic state after the requested compressor run time has elapsed;

    a power supply configured to generate a proxy call-for-cool control signal that is set to the first logic state irrespective of the requested compressor run time;

    a compressor time-extending switching device having;

    a first terminal including means for electrically connecting to a control circuit that controls electrical power to a compressor of the HVAC system when the first terminal is at the first logic state;

    a second terminal including means for receiving the call-for-cool control signal from the temperature control device, anda third terminal including means for receiving a proxy call-for-cool control signal from the power supply,the compressor time-extending switching device configured to extend an individual compressor run time when a requested compressor run time period is less than a predetermined minimum compressor run time period by selectively disconnecting the first terminal from the second terminal and connecting the first terminal to the third terminal, thereby causing the control circuit to receive the first logic state of the proxy call-for-cool control signal and extending the compressor run time irrespective of the logic state of the call-for-cool control signal.

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