Patent ID: 8516841

Claim:
A heating and air conditioning device ( 20 ) for an automotive vehicle, comprising a refrigerant circuit ( 4 ) in which a refrigerant circulates between three distinctive units ( 6 ), ( 10 ), ( 14 ) and exchanging heat with respective secondary liquid loops ( 8 ), ( 12 ), ( 16 ), said device comprising: an evaporating unit ( 6 ) dedicated to the evaporation of the refrigerant when operating in a cooling mode, a cooling unit ( 10 ) dedicated to the cooling or condensation of the refrigerant when operating in the cooling mode as well as operating in the heating mode, and a reversible unit ( 14 ) dedicated to the evaporation of the refrigerant when operating in the heating mode and dedicated to the cooling or condensation of the refrigerant when operating in the cooling mode, wherein the reversible unit ( 14 ) includes two water heat exchangers ( 14 a , 14 b ) and the refrigerant within the reversible unit ( 14 ) exchanges heat with two distinctive loops ( 16 a , 16 b ) operating at different temperature levels to provide two stage cooling or heating within the reversible unit ( 14 ).