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WarningRefrigeration

CO2 Flash Tank / Receiver Pressure (Flash Gas Bypass) Fault

The intermediate flash-tank/receiver pressure drifts off target because the flash gas bypass (FGB) valve isn't controlling correctly, upsetting liquid feed to the cases.

Symptoms
  • Flash tank / receiver pressure off its controller setpoint (setpoint is system-specific — check the controller and system documentation)
  • MT suction pressure disturbed by bypass flash gas
  • Cases starving or flooding across the whole rack
  • FGB valve hunting or pegged open/closed
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Likely causes, step-by-step troubleshooting & safety notes

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For qualified refrigeration technicians. Always follow manufacturer procedures and local codes. R-290 (propane) and other flammable refrigerants require A3-rated tools and safety practices.