“In winter, if the system is stopped, the water inside the exchangers can freeze damaging the system irreparably; thus, it is recommended to use glycol mixtures (see following paragraphs: please consider the different outputs and absorption by the chiller, the pump sizing and the performance of the system terminals/conditioners) or drain the system completely, using the suitable cocks arranged in the exchangers and in the circuit, trying to drain the water residues blowing air in the lines.”