Chapter 8.0 Operating Envelopes
• • • CAUTION • • •
Rating Envelope Limits
The rating envelopes which follow are only a representative guide to the operating range of each compressor model. Be certain that
expected operation is verified by a rating using the most recent version of the CPR tool. If you have any questions about whether the
compressor you are rating is appropriate for the application conditions, please consult your local Danfoss LLC Application
Engineer for expert guidance.
Danfoss LLC has recently developed several variants of our compressors, each of which is designed to operate in a specific Saturated
Suction Temperature (SST) range. Danfoss LLC strongly urges selecting a compressor which covers the range of SST expected for the
application. Danfoss LLC will not accept responsibility for any rating discrepancies resulting from operation outside of the SST ranges in
these envelopes or those in the current CPR rating.
There are also possible cases where operation at SST condition limits above those specified and rated for a particular variant, but
operation may be limited by the maximum ambient temperature around the compressor, the saturated discharge temperature, and the
compressor power input. Before offering a compressor to the market above the SST limits of each variant, they must be validated by the
OEM through controlled testing at steady state conditions at the application conditions required for a minimum of 3.5 hours. This
validation test must be reviewed and approved by Danfoss LLC Applications to ensure the compressor is able to maintain stable
operation within the limits tested.
The BMCC does not prevent operation below the SST limit for some compressor variants. This flexibility is intended to permit operation
during transitional periods which may occur during a pull-down or batch loading process. Extended operation below the minimum SST
limits for a compressor variant may result in the rejection of a warranty claim if the root cause of the failure is determined to be related
to extended operation with SST below the variant limit.
M-AP-001-EN Rev. S-9/8/2021 Page 55 of 136
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