Why is pressurizing a system with pure refrigerant the least preferred way to leak test it?
Leak detection · EPA 608 Type II. The correct answer, and the reasoning behind it.
Signs of leaks in high-pressure systems and leak testing before charging.
The question
Why is pressurizing a system with pure refrigerant the least preferred way to leak test it?
- Refrigerant cannot reach a high enough pressure
- Refrigerant reacts with brazed joints
- Electronic detectors cannot sense a pure refrigerant charge
- Refrigerant is released when the test gas is let outCorrect answer
Why “Refrigerant is released when the test gas is let out” is correct
Whatever gas is used to pressurize the system is eventually released or lost through the leak. Using pure refrigerant means a full test charge of refrigerant escapes, which is why EPA ranks it below nitrogen and nitrogen with a trace gas.
Source: EPA: Test Topics
Why the other answers are wrong
- Refrigerant cannot reach a high enough pressure — Pressure is not the problem; emissions are.
- Refrigerant reacts with brazed joints — Refrigerant does not attack brazed joints during a leak test.
- Electronic detectors cannot sense a pure refrigerant charge — Electronic detectors sense pure refrigerant well; that is not the drawback.
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Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.