I have a client who is asking if I can retrofit his McQuay Frame 3200 screw compressor on a water cooled chiller with a variable speed drive to improve energy efficiency. He can get a government subsidy to fund the works. My concern is with heat and oil and other unknowns when speed controlling the compresor.

Control is not an issue. It has been retrofitted with aftermarket controls and we have full access to it's complete function set and software.

Can anyone tell me how these Frame 3200's respond to speeds at less than 100%?