HI Folks, can any one help? i have a cold store on a lpr pack, 12cyl grasso compound, and i am getting a low superheat at the compressor when i can see the level in the drum at half the sight glass , being the correct charge to submerge the liquid line being subcooled. i am evaporating at -33 c and "dry return" is at 31-32 c, there is a hp float that controls the main llsv and a bleed v/v always energised both with a 3mm orifice plate. any suggestions why i should be getting such a low superheat at the m/c

Thanks