We have a York YTK7C8F1-CSJ machine that we can't seem to stablize the condenser refrigerant level. With a setpoint of 50%, it hunts +/- 25%, no matter how we set up the valve control settings. This chiller operates under near stable load conditions (data center). What is a normal fluctuation for the level? Is +/- 5% a realistic goal? We have calibrated the level sensor per York's service bulletin. Any more info needed, let me know.

Thanks in advance.