Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system using R-407C has an evaporator temperature of -5°C and a condenser temperature of 40°C. Using a PT chart, what would be the approximate gauge pressures for the suction and discharge lines, respectively? (Assume atmospheric pressure of 101 kPa.)
For R-407C, a saturation temperature of -5°C corresponds to an absolute pressure of approx. 441 kPa. Gauge pressure = 441 - 101 = 340 kPa. For 40°C, the absolut
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Question: A refrigeration system using R-407C has an evaporator temperature of -5°C and a condenser temperature of 40°C. Using a PT chart, what would be the approximate gauge pressures for the suction and discharge lines, respectively? (Assume atmospheric pressure of 101 kPa.)
Answer options: ✅ 340 kPa and 1950 kPa
- 420 kPa and 2100 kPa
- 285 kPa and 1800 kPa
- 300 kPa and 2050 kPa
Correct answer: 340 kPa and 1950 kPa
Explanation: For R-407C, a saturation temperature of -5°C corresponds to an absolute pressure of approx. 441 kPa. Gauge pressure = 441 - 101 = 340 kPa. For 40°C, the absolute pressure is approx. 2051 kPa. Gauge pressure = 2051 - 101 = 1950 kPa. Precise PT chart reading is crucial for diagnostics.
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