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Rotation speed control device, air conditioner, and rotation speed control method

  • US 8,015,834 B2
  • Filed: 02/13/2007
  • Issued: 09/13/2011
  • Est. Priority Date: 02/17/2006
  • Status: Expired due to Fees
First Claim
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1. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:

  • a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of the refrigerant circuit;

    a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency in order to obtain a differential pressure between the high and low pressure of a compressor; and

    a switching unit configured to execute a switching control in which said switching control switchesto the first control from the second control if a first switching condition is met while the second control is being executed, andto the second control from the first control if a second switching condition is met while the first control is being executed,said first switching condition including a first outside-air-temperature condition where the outside air temperature is lower than a first temperature when operating in a cooling mode, andsaid second switching condition including a condition where the differential pressure between the high and low pressure of the compressor is below a predetermined standard value.

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