Chapter 7.0 Compressor Performance
7.1 Performance Ratings
Compressor performance, including applicable capacity range, varies based on the operating conditions. The
capacity range, efficiency, and other operational information for each compressor can be determined only by using
the authorized software known as the Compressor Performance Rating (CPR) Engine or CPR Engine. This software
and a selection tool is available on our website.
7.2 Tolerance of Performance Ratings
The CPR rating conditions are based on flange-to-flange and do not take into effect any line pressure drops or
piping inconsistent with the guidance in the manual.
Compressors are guaranteed to meet the published performance ratings in the current CPR tool within the tolerance
band published in CPR. Higher accuracy is predicted in the speed only range and tolerance increases in the
mechanical unloading range (IGV < 110%). Higher tolerances are also published in the low lift and ultra-low lift
ranges. Refrigerant choice may also impact the rating tolerance.
M-AP-001-EN Rev. S-9/8/2021 Page 53 of 136
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