Patent ID: 6935125

Claim:
An air conditioning system comprising a compressor for drawing in and compressing a refrigerant, an external heat exchanger for performing heat exchange between outside air and the refrigerant, an inner heat exchanger for performing heat exchange between air that is to be blown into a passenger compartment and the refrigerant, a pressure reducing device provided along a refrigerant passageway which connects the external heat exchanger with the inner heat exchanger for reducing the pressure of the refrigerant, a bypass circuit for introducing the refrigerant discharged from the compressor into the inner heat exchanger by making the refrigerant bypass the external heat exchanger and the pressure reducing apparatus, a selector valve for performing a selection between a cooling mode in which the refrigerant discharged from the compressor is circulated from the external heat exchanger, the pressure reducing device, the inner heat exchanger and the compressor in that order and a hot gas heating mode in which the refrigerant discharged from the compressor is circulated from the bypass circuit, the inner heat exchanger and the compressor in that order, a blower for sending air into the inner heat exchanger, and high-pressure control means for controlling a high pressure of the refrigerant discharged from the compressor based on the air blowing amount so that the high pressure of the refrigerant is increased; wherein the high pressure control means controls the high pressure based on the air blowing amount only in a case where the refrigerant discharged from the compressor is caused to flow to the inner heat exchange side.