Heating, ventilating and/or air-conditioning device for motor vehicle, has switching unit in position in which refrigerant is flown from compressor toward internal exchanger, accumulator, evaporator, external exchanger and compressor

摘要

The device (10) has an accumulator (20) whose gas outlet (58) is connected to an internal heat exchanger (16). A switching unit (24) is selectively brought back to a position in which refrigerant is flown from a compressor (12) toward an external heat exchanger (14), the accumulator, the internal heat exchanger, an evaporator (22), and the compressor, and another position in which the refrigerant is flown from the compressor toward the internal heat exchanger, the accumulator, the evaporator, the external heat exchanger and the compressor.