I am currently looking into adding a VFD to one chiller in my 3 chiller plant (3 750 TRANE 1984 Chillers). I plan to make that chiller the lead one. Since the other chiller will serve as a backup only, they will be off line most of the time.
What problems can arise from having chillers off line? I know one problem is air infiltration and refrigerant leakage, but I found a company that claim it can solve this problem by recirculating hot water thus raising the regrigerant pressure to Atmospheric Pressure. It's called prevac Aquapower, did anyone here ever used it?