A method for remotely configuring, by a final user, a machine for recovering and regenerating a refrigerant fluid in an air-conditioning plant, in such a way that said machine is able to treat only a determined refrigerant fluid among a plurality of possible refrigerant fluids, said method for configuring comprising the steps of: - delivery to said final user of said machine for recovering and regenerating a refrigerant fluid in an air conditioning plant, said machine being provided with a local processing unit; - delivery to said final user a predetermined kit of basic fittings selected by said final user among a plurality of kit of fittings, each kit of said plurality being arranged to mechanically configure said machine in such a way to be able to treat only said determined refrigerant fluid, said determined kit of basic fittings being associated to a predetermined kit code provided to said final user; said method being characterized in that said machine is associated to a predetermined activation code provided to said final user and in that the method, furthermore, comprises the steps of: - communication by said final user of said activation code and of said kit code to a remote control unit, said communication being carried out by an electronic device connected to said remote control unit; - verifying of said activation code and of said kit code by said remote control unit; - generation and sending by said remote control unit to said final user of an unlocking code if the output of said verifying step is positive; - communication of said unlocking code to said local processing unit of said machine by said final user; - finalizing of said machine by said local processing unit by installing a predetermined software program selected among a plurality of software programs, each of which corresponding to a determined refrigerant fluid, said predetermined software being arranged to set predetermined values of a predetermined plurality of exercise parameters of said machine corresponding to said predetermined refrigerant fluid; - activation of said machine at the end of said finalizing step. - delivery to said final user of said machine for recovering and regenerating a refrigerant fluid in an air conditioning plant, said machine being provided with a local processing unit; - delivery to said final user a predetermined kit of basic fittings selected by said final user among a plurality of kit of fittings, each kit of said plurality being arranged to mechanically configure said machine in such a way to be able to treat only said determined refrigerant fluid, said determined kit of basic fittings being associated to a predetermined kit code provided to said final user; - communication by said final user of said activation code and of said kit code to a remote control unit, said communication being carried out by an electronic device connected to said remote control unit; - verifying of said activation code and of said kit code by said remote control unit; - generation and sending by said remote control unit to said final user of an unlocking code if the output of said verifying step is positive; - communication of said unlocking code to said local processing unit of said machine by said final user; - finalizing of said machine by said local processing unit by installing a predetermined software program selected among a plurality of software programs, each of which corresponding to a determined refrigerant fluid, said predetermined software being arranged to set predetermined values of a predetermined plurality of exercise parameters of said machine corresponding to said predetermined refrigerant fluid; - activation of said machine at the end of said finalizing step.