Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is checking subcooling on an R-134a system. The liquid line pressure is 1200 kPa gauge, and the liquid line temperature is 35°C. What is the subcooling? (Assume atmospheric pressure is 101 kPa.)
Absolute pressure = 1200 kPa + 101 kPa = 1301 kPa. For R-134a, at 1301 kPa, the saturation temperature is approx. 40°C. Subcooling = Saturation temperature - Li
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Question: A technician is checking subcooling on an R-134a system. The liquid line pressure is 1200 kPa gauge, and the liquid line temperature is 35°C. What is the subcooling? (Assume atmospheric pressure is 101 kPa.)
Answer options:
- 2.8°C ✅ 5.0°C
- 7.2°C
- 10.0°C
Correct answer: 5.0°C
Explanation: Absolute pressure = 1200 kPa + 101 kPa = 1301 kPa. For R-134a, at 1301 kPa, the saturation temperature is approx. 40°C. Subcooling = Saturation temperature - Liquid line temperature = 40°C - 35°C = 5.0°C. This calculation helps ensure complete liquid refrigerant flow to the expansion device.
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