Patent ID: 6745583
Filing Date: 2004-06-08
Classification: F25B

Abstract:
A defrosting apparatus of an air conditioner having compressors, an indoor heat exchanger, an outdoor heat exchanger, a switching valve arranged between the compressors and the indoor and outdoor heat exchangers for switching a coolant path, an LEV (Linear Expansion Valve) arranged between the indoor and outdoor heat exchangers, and a system controller for controlling the switching valve where frost is formed in the outdoor heat exchangers at a heating operation and performing a defrosting operation, comprising:a temperature sensor for sensing a pipe temperature of the outdoor heat exchanger and an outdoor temperature; a comparator for comparing the sensed pipe temperature of the outdoor heat exchanger and the sensed outdoor temperature, and generating and outputting a comparison signal; and a valve controller for increasing an opening value of the LEV at a defrosting operation and decreasing the opening value of the LEV at a defrosting operation termination.