Hi, I am monitoring a couple low and medium temp hill phoenix racks. Both have Bitzer screw compressors with two unloaders on each compressor staging capacity at 50%, 75%, and 100%. I have had great success in removing unloaders from capacity control on Carlyle screws because of their inefficiencies. I don't know much about the Bitzers yet and was wondering if anybody had any experience or data on Bitzer screw unloaders and efficiencies?

Bitzer HSN5343-25 Low temp
Bitzer HSK5343-30 Med temp