45 of 114M-AP-001-EN Rev. Q
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
Engine” or “CPR Engine.” This software and a selection tool is available on our website.
7.2 Tolerance of Performance Ratings
All TTS/TGS/TTH/TGH compressors are guaranteed to meet the published performance ratings in
our CPR Engine within ±5% for capacity, efficiency, and power for given operating conditions. This
tolerance band is valid for the area of the operating map, which is in the speed control range only.
As the compressor reduces speed and mechanical unloading is enabled such as the closing of the
variable IGV, the tolerance increases to ±10%.
The conditions considered are only the flange-to-flange conditions seen at the compressor rather than
the conditions seen at other points in the system.
The compressor performance ratings are based on using R-134a for the TTS/TTH series compressors
and R-1234ze for the TGS/TGH series compressors. The use of alternative refrigerants in these
compressors may lead to variances in the performance. When using refrigerant R-513A, the tolerance
rating is increased by an additional 1.5% so that it is ±6.5% in the speed control range and 11.5% in
the area where mechanical unloading is enabled.
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