An appliance control system is described for controlling a plurality of appliances. The locking operations for a plurality of the first and second seat locking mechanisms can be carried out collectively and easily. Said membrane-electrode assembly is used in fuel cells, in water electrolysis and in other electrochemical process. Preferably, a control flow graph of the program being measured is constructed. According to the invention at least occasionally at least a substream of the compressed nitrogen-rich fraction is expanded after condensation thereof and, for the purpose of cold generation, is at least in part, preferably completely, vaporized.