49. To change the compressor on a system containing R-410A, you must isolate the compressor then:

Simply remove the compressor.
Evacuate the isolated section of the system to atmospheric pressure and hold. if system pressure does not rise, remove the compressor.
Evacuate the isolated section of the system to 10 inches of vacuum and hold. If system pressure does not rise, remove the compressor.
Evacuate the isolated section of the system to 15 inches of vacuum and hold. If system pressure does not rise, remove the compressor.

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