To change the compressor on a system containing 40 pounds of R-500, using a recycling machine manufactured AFTER November 15, 1993, you must isolate the compressor, then: evacuate the isolated section of the system to ____ inches of vacuum and hold. If the system pressure does not rise, remove the compressor.

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When servicing a compressor, you want to make sure the portion of the system you’re removing the compressor from is dry and free of leaks. After isolating the compressor, evacuate that isolated section to ten inches of mercury and hold. Ten inches provides a practical depth of vacuum that removes moisture and non-condensables and also allows a simple leak test: if the isolated section can stay at that vacuum (the pressure does not rise) after you stop the pump, there aren’t leaks feeding air or refrigerant into that part, so you can safely remove the compressor. If the pressure rises, it indicates a leak, and you’d need to address that before proceeding.