Answer :

Final answer:

Evacuating an R22 system typically involves pulling a vacuum not measuring pressure in psig. The target is generally below 500 microns, which is equivalent to a deep vacuum state, well past 0 psig which is atmospheric pressure.

Explanation:

When evacuating an R22 refrigeration system, it's essential to remove as much of the refrigerant as possible to avoid contaminating the system with moisture, air, and non-condensables, which can affect performance and lead to system damage. The targeted vacuum level for evacuation is generally below 500 microns, which ensures that most of the moisture and air is removed. However, your question specifies pressure in psig (pounds per square inch gauge) rather than a vacuum level in microns. The options you provided don't represent a vacuum; they represent gauge pressures. If you are asking for a vacuum level to pull down to, none of these options are correct; we aim for a level well into a vacuum, not a pressure above atmospheric. If we interpret your question as needing the pressure to not exceed a certain value before adding refrigerant, 0 psig would be the atmospheric pressure and the most neutral point to avoid outside air from entering.

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