Hi,
Thank u first,we have chiller that use in moulding machine,having 4 compressor,with 407 c refrigerant they said its a long time problem that always show in alarm that low pressure,today i saw it that # 3 compressor is the low pressure.My experiences is in Middle east (kuwait)thats why im not pamiliar here in UK.Can i add gas if i found it that less gas?This is air cooled unit.

Thank u if you will give me an advice
Cesar/Nottingham