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Heat pump motor optimization and sensor fault detection

  • US 5,440,895 A
  • Filed: 01/24/1994
  • Issued: 08/15/1995
  • Est. Priority Date: 01/24/1994
  • Status: Expired due to Term
First Claim
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1. In a heat pump system powered by an electrical line, including a refrigerant compressor and an electrically controlled expansion valve, a system operating method comprising,obtaining an outdoor air temperature by measuring a property indicative of the outdoor air temperature;

  • obtaining a line voltage by measuring a property indicative of line voltage;

    comparing the outdoor air temperature with a predetermined temperature indicative of an alert condition;

    comparing the line voltage to a predetermined value indicative of a low voltage condition, andbased on said comparing steps;

    if the outdoor air temperature is above said predetermined temperature and if the line voltage is below said predetermined value, then automatically increasing the setting of said expansion valve to increase the flow of refrigerant in said heat pump system.

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