WarningRefrigeration
CO2 MT Suction Pressure High
Medium-temp suction pressure runs above target, warming MT cases and forcing the LT stage to work against a high interstage. Often a staging, flash-gas, or false-load problem rather than a compressor fault.
Symptoms
- MT suction/SST above setpoint; MT cases losing temperature
- LT compressors struggling (their discharge dumps into a high MT suction)
- Flash-gas bypass wide open or parallel compressor not carrying flash gas
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