Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system is operating with R-410A. The suction line pressure is measured at 860 kPa gauge, and the temperature at the compressor inlet is 8°C. What is the superheat? (Assume atmospheric pressure is 101 kPa.)
Convert gauge pressure to absolute: 860 kPa + 101 kPa = 961 kPa. For R-410A, at 961 kPa, the saturation temperature is approximately 3.5°C. Superheat = Suction
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Question: A refrigeration system is operating with R-410A. The suction line pressure is measured at 860 kPa gauge, and the temperature at the compressor inlet is 8°C. What is the superheat? (Assume atmospheric pressure is 101 kPa.)
Answer options: ✅ 4.5°C
- 8°C
- 12.5°C
- 16°C
Correct answer: 4.5°C
Explanation: Convert gauge pressure to absolute: 860 kPa + 101 kPa = 961 kPa. For R-410A, at 961 kPa, the saturation temperature is approximately 3.5°C. Superheat = Suction temperature - Saturation temperature = 8°C - 3.5°C = 4.5°C. This is a fundamental calculation for assessing system performance.
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