Air conditioning system and control method thereof

Abstract

An air conditioning system includes an indoor heat exchanging unit, an outdoor heat exchanging unit, a compressor forming a closed loop together with the indoor and outdoor heat exchanging units to compress refrigerant, and a compressor driver to drive the compressor. The air conditioning system also includes an outdoor temperature sensor to sense outdoor temperature, a high pressure sensor to sense a pressure of the refrigerant discharged from the compressor, a low pressure sensor to sense the pressure of the refrigerant introduced into the compressor, a bypass pipe to connect a refrigerant pipe disposed between the indoor heat and outdoor heat exchanging units with a refrigerant pipe disposed in an influx part of the compressor, a bypass valve to open and close the bypass pipe, and a controller to open the bypass valve when the pressure sensed by the low pressure sensor is a predetermined target low pressure or is below the predetermined target low pressure, and to close the bypass valve when the pressure sensed by the high pressure sensor is over a predetermined target high pressure, under a condition in which the outdoor temperature sensed by the outdoor temperature sensor is a predetermined reference temperature or is below the predetermined reference temperature during a heating operation. Thus, the air conditioning system and a control method thereof, is improved in heating effect while performing a heating operation under a condition in which the outdoor temperature is low.

Dependencies are inferred from the claim text.