Patent ID: 8015834
Filing Date: 2011-09-13
Classification: F24F,F25B,Y02B

Abstract:
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 switches 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, and said 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.