CriticalRefrigeration
CO2 High Gas Cooler / Discharge Pressure
On a transcritical CO2 rack the high side runs above the optimum gas-cooler pressure target, hurting efficiency and risking high-pressure trips or relief-valve discharge (relief settings are system-specific — see the unit nameplate).
Symptoms
- High-side pressure above the calculated optimum for the gas-cooler outlet temp
- MT compressors loaded/overamping, poor COP
- High-pressure alarm, or high side approaching the high-pressure cut-out / relief setting shown on the unit
- Gas-cooler outlet (approach) temperature high
Unlock the full fix
Likely causes, step-by-step troubleshooting & safety notes
Get the complete diagnostic guide for CO2 High Gas Cooler / Discharge Pressure — plus the full fault library, guided diagnostics, AI + photo diagnose, and CO₂ & R-290 reference. Start free, no card needed.
Related faults