Patent ID: 6779353
Filing Date: 2004-08-24
Classification: F25B,F25D,Y02B

Abstract:
A method for controlling a sealed system for forcing cold air through a first and a second compartment, the sealed system including a variable speed compressor, a condenser fan, an evaporator fan and a second compartment fan, the sealed system further including a controller operatively coupled to the variable speed compressor, the condenser fan, the evaporator fan and the second fan, said method comprising:establishing a control grid having at least one axis corresponding to a temperature at the first compartment, the axis divided into a plurality of operating states of the sealed system, each of the states corresponding to a sensed temperature condition at the first compartment, and each of the states including a designated compressor speed parameter, the compressor speed parameter in some of the states different from the compressor speed parameter in other of the states; operating each of the compressor and the condenser fan in a first complementary speed in at least a first one of the states; operating each of the compressor and the condenser fan in a second speed complementary in at least a second one of the states, the second speed less than the first speed; and operating each of the compressor and condenser fan in a third speed in at least a third one of the states in the control grid, the third speed in between the first speed and the second speed, wherein operating each of the compressor and condenser fan at disparate speeds in at least a second one of the states of the control grid comprises operating the condenser fan in the third speed and operating the condenser fan at a fourth speed, the fourth speed greater than the first speed.