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Apparatus and method for preventing an evaporating for an air conditioning system form freezing

  • US 6,055,819 A
  • Filed: 06/08/1998
  • Issued: 05/02/2000
  • Est. Priority Date: 06/28/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for preventing an evaporator of an air conditioner from freezing, the apparatus comprising:

  • a fan disposed at a front of a condenser for blowing an air toward the condenser;

    a first temperature sensor which detects an outdoor temperature and generates a first signal;

    a second temperature sensor which detects a surface temperature of the condenser and generates a second signal;

    a control section which receives the first and second signals from the first and second temperature sensors and generates a control signal based on the first and second signals for varying an R.P.M. of a motor assembly, the motor assembly connected to the fan for rotating the fan; and

    an inverter which receives the control signal from the control section and modulates a frequency supplied thereto from a power source based on the control signal, thereby applying a modulated frequency to the motor assembly, wherein the control section generates a first control signal for rotating the fan at a high speed when the outdoor temperature is higher than a first predetermined temperature, a second control signal for rotating the fan at a middle speed when the outdoor temperature is lower than or equal to the first predetermined temperature, and a third control signal for rotating the fan at a low speed when the surface temperature of the condenser is lower than a second predetermined temperature, thereby constantly maintaining an internal pressure of the condenser.

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