Patent ID: 6990822
Filing Date: 2006-01-31
Classification: F25B

Abstract:
1. A pressure adjusting device for adjusting pressure in an indoor heat exchanger of an air conditioning system, comprising: pressure detecting means for detecting a pressure value of refrigerant in the indoor heat exchanger; an electric powered expansion valve configured to be installed in a gaseous refrigerant pipe that connects the indoor heat exchanger to a compressor of an outdoor unit of the air conditioning system; and opening adjusting means that adjusts an opening of the electric powered expansion valve based on the pressure value of the refrigerant detected by the pressure detecting means such that the pressure value of the refrigerant is adjusted to a prescribed pressure setting value, the opening adjusting means being configured to provide the electric powered expansion valve with an opening value that is appropriate for an oil recovery mode when the air conditioning system runs in the oil recovery mode in order to return lubricating oil that has accumulated in a refrigerant circuit to the compressor.