HVAC EPA Type I Practice Test

Access More Questions

True or false: Non-condensables in a recovery cylinder can cause the pressure to be higher than expected at a given temperature.

True False Only at high temperatures Not known

Correct Answer:

True

Explanation:

Non-condensables in a recovery cylinder raise the pressure at a given temperature because they are gases that do not condense with the refrigerant. When a cylinder contains both refrigerant vapor and non-condensables (like air), the total pressure reflects the contribution of all gases present. The refrigerant has its own saturated vapor pressure at that temperature, but the non-condensables add extra pressure that cannot condense away, so the overall pressure ends up higher than the refrigerant’s pure-vapor pressure. This is why charts that assume pure refrigerant don’t match the measured pressure if non-condensables are present. So the statement is true, and the idea that it only happens at high temperatures or that it’s unknown isn’t correct.

Access more questions from this quiz

Continue to HVAC EPA Type I Practice Test for more practice questions and the full quiz experience.

Access More Questions