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WarningCO₂ Transcritical

CO2 Moisture / Dry-Ice (Triple Point) Blockage

Moisture in a CO2 system, or letting pressure fall below the triple point (75.1 psia ≈ 60 psig / -69.8°F), can form ice or solid dry ice and block metering devices.

Symptoms
  • Intermittent restriction / starving that clears then returns
  • Blockage after a charging error or deep pressure drop
  • Acidic oil test results (carbonic acid) / moisture indicator alarm
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CO2 Standstill / Off-Cycle Pressure RiseNon-Condensables (Air) in SystemLow Suction Pressure
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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.