We have a client experiencing some problems with McQuay ALS series chillers (air cooled screws). The problems are repeated compressor failures, particularly the gate rotors. I'm told they are a composite material and pieces are shearing off. This is happening on multiple chillers (ALS-195, 285; year is 1996). Some are on the second or third failure. Has anyone heard of, or had experience with similar problems? Is this somehow isolated to these 2 machines or is it symptomatic of this series? The same client is having another problem on a 1999 ALS-220 with the phenolic coil coating literally flaking off. Any thoughts would be appreciated.
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