Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is performing a pressure test on a newly installed split system designed for R-410A. The system has been evacuated and is being pressure tested with nitrogen. What is the maximum safe test pressure for such a system, considering R-410A design pressures?
According to CSA B52 Safety Code for Mechanical Refrigeration, the test pressure should be at least the design pressure and not more than 1.1 times the design p
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Question: A technician is performing a pressure test on a newly installed split system designed for R-410A. The system has been evacuated and is being pressure tested with nitrogen. What is the maximum safe test pressure for such a system, considering R-410A design pressures?
Answer options: ✅ Approximately 1.1 times the system's maximum operating pressure (e.g., 2750 kPa for the high side).
- 1000 kPa (145 psi) for all R-410A systems.
- The saturation pressure of R-410A at 25°C.
- 200 kPa (29 psi) according to CSA B52 standard testing.
Correct answer: Approximately 1.1 times the system's maximum operating pressure (e.g., 2750 kPa for the high side).
Explanation: According to CSA B52 Safety Code for Mechanical Refrigeration, the test pressure should be at least the design pressure and not more than 1.1 times the design pressure for the components. For R-410A systems, high-side design pressures can be around 2500 kPa, making a test pressure around 2750 kPa appropriate, respecting component ratings.
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