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Defrost control apparatus and method for a refrigerating system

  • US 5,251,454 A
  • Filed: 01/30/1992
  • Issued: 10/12/1993
  • Est. Priority Date: 01/31/1991
  • Status: Expired due to Fees
First Claim
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1. A refrigerating system including an evaporator, a fan for blowing air through the evaporator and a defrost heater, comprising:

  • a temperature sensing means disposed near the evaporator;

    a microprocessor for obtaining a difference between a temperature sensed by the temperature sensing means when the fan is driven and a temperature sensed by the temperature sensing means when the fan is paused, said microprocessor controlling the fan, initiating a defrost operation by driving the defrost heater when the difference in temperature is less than a first set value, and completing the defrost operation by turning off the defrost heater when the temperature sensed by the temperature sensing means is greater than a second set value.

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