The invention relates to a refrigeration machine, particularly a heat pump, comprising a closed circuit, which contains a coolant and in which an evaporator, a compressor, a condenser and an, in particular, electrically operated expansion valve are arranged one after the other. The problem is overcome or at least ameliorated by preparation of a base composition, suitable for employment in conjunction with a propellant, that contains a low molecular weight polyethylene glycol as humectant, and particularly a PEG of molecular weight 150 to 500. The method then uses the lift apparatus to raise the component into a selected one of the one or more available rack locations.