Patent ID: 7793511

Claim:
A multi type air-conditioner, comprising: an outdoor unit having a plurality of outdoor heat exchangers that heat exchanges with outdoor air and a compressor that compresses a refrigerant; a plurality of indoor units that performs either cooling or heating; a high pressure pipe connected between a discharge side of the compressor and the plurality of indoor units; a low pressure pipe connected between a suction side of the compressor and the plurality of indoor units; and a refrigerant exhauster provided between the high pressure pipe and the low pressure pipe, that discharges a liquid refrigerant to the low pressure pipe when the liquid refrigerant is accumulated in the high pressure pipe, wherein the refrigerant exhauster comprises: a connection tube connected between the high pressure pipe and the low pressure pipe; an open and shut valve installed on the connection tube, that opens and closes the connection tube; a first temperature sensor installed on the discharge side of the compressor, that detects a temperature of the discharge side of the compressor; a second temperature sensor installed on the high pressure pipe, that detects a temperature of the high pressure pipe; a controller that controls the open and shut valve according to signals applied from the first temperature sensor and the second temperature sensor; and a capillary tube installed on the connection tube wherein the controller is configured to compare the discharge temperature of the compressor and the temperature of the high pressure pipe, decide whether a temperature difference therebetween is more than a set value, close the open and shut valve to maintain a state in which the connection tube is blocked when the temperature difference therebetween is less than the set value, and drive the open and shut valve so as to open the connection tube when the temperature difference therebetween is more than a set value.