Is there anybody who can help with this make of chiller. unfortunatly there is a lack of technical help from the manufacturer....basicaly within 60s of start up circ 1 goes i to fault, (low differential pressure alarm) .. no one can tell me what is causing this. at start up the operating pressures are the same as circuit 2. within the pco controller there is an option to disable the low diff alarm or alter its paramaters. if disabled then c1 fails to even try and start..your thoughts would be apreciated