A method for converting a refrigerant recovery unit from use with a first refrigerant to use with a second refrigerant includes the steps of opening, with a controller, solenoids along a refrigerant path to remove residue of the first refrigerant into a holding vessel, operating a vacuum pump, as indicated by the controller, to further remove the residue of the first refrigerant from the refrigerant path, introducing, via the controller, an amount of the second refrigerant into the refrigerant path, determining, with a refrigerant identifier, a purity of the second refrigerant in the refrigerant path. A kit is also provided to convert the refrigerant recovery unit for use with the first refrigerant to the second refrigerant.