McQuay screw compressors
McQuay screw compressors
(OP)
I am looking for some history on McQuays screw chiller (mono screw) relative to compressor failures they have had and causes.
I believe this compressor is no longer manufactured but was approx 5 years ago
I believe this compressor is no longer manufactured but was approx 5 years ago





RE: McQuay screw compressors
With the McQuay screw they are trying to lubricate it with the 3% or 4% of oil mixed in the refrigerant, hence all the failures. They have since gone to a positive displacement oil setup with a seperator, this has improved the failure rate.
They also use Plastique gate rotors which fail almost on a regular basis. The original gates were compliant type which had no tolerance for floodback, the newer non compliant gates where they put a beveled washed under it to give it some additional tolerances have also helped.
IMO I wouldnt sell one. If the customer wanted one it would only be sold with the 5 year extended warranty. If you need a chiller thats dependable this wouldnt be high on my list. JMHO