Refrigeration & Air Conditioning Mechanic Red Seal · Question
A semi-hermetic compressor in an R-404A system is operating with a discharge pressure of 2100 kPa gauge and a discharge temperature of 95°C. The saturated condensing temperature at 2100 kPa gauge is 48°C. What does this high discharge temperature most likely indicate, assuming normal suction conditions?
A high discharge temperature, significantly above the saturated condensing temperature for R-404A, often indicates high superheat entering the compressor, typic
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Question: A semi-hermetic compressor in an R-404A system is operating with a discharge pressure of 2100 kPa gauge and a discharge temperature of 95°C. The saturated condensing temperature at 2100 kPa gauge is 48°C. What does this high discharge temperature most likely indicate, assuming normal suction conditions?
Answer options:
- Compressor is operating efficiently.
- Liquid floodback to the compressor. ✅ Low refrigerant charge or high superheat at the suction.
- Condenser is oversized.
Correct answer: Low refrigerant charge or high superheat at the suction.
Explanation: A high discharge temperature, significantly above the saturated condensing temperature for R-404A, often indicates high superheat entering the compressor, typically due to low refrigerant charge or an underexpanding TXV.
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