Abstract: A method of operating a refrigeration plant (10) which comprises sensing means (16a, 16b, 16c) designed to detect or derive an overheating temperature Tsh at an intake of a compressor assembly (12) of the refrigeration plant (10). The method comprises: a standard operating mode A that sets an optimal value Ropt, for the operating regime of the compressor Rcomp(t); a mode B, which verifies, whether the overheating temperature Tsh exceeds a threshold value Max, to verify whether the operating regime Rcomp(t) of the compressor assembly (12) is greater than a safety value Mpd and, in the case of a positive outcome, to limit the operating regime Rcomp(t) of the compressor assembly (12) to a safety value Mpd, setting the optimal value Ropt, overriding mode A.