A recovery cylinder half full of recovered R-410A at 90 degrees F will be pressurized to approximately what psi level if there are no non-condensables?

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The correct pressure in a recovery cylinder half full of R-410A at 90 degrees Fahrenheit, assuming there are no non-condensables present, is approximately 300 psig. This is due to the properties of R-410A as a refrigerant, which maintains a specific saturation pressure at given temperatures.

R-410A has a significant relationship between temperature and pressure, which can be understood through its pressure-temperature chart. At 90 degrees Fahrenheit, the saturated pressure of R-410A is indeed close to 300 psig without the presence of any non-condensable gases in the cylinder. Non-condensables, such as air, would increase the pressure readings inaccurately; however, the question stipulates a scenario where they are absent.

This means that the only contributing factor to the pressure in the cylinder is the R-410A itself, which would result in a pressure level around 300 psig at that temperature. Understanding the specific pressure-temperature relationship of refrigerants like R-410A is crucial for handling and recovering refrigerants correctly, ensuring safe and efficient operations in HVAC practices.