A refrigerant evacuation requires pulling to at least how many microns?

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Multiple Choice

A refrigerant evacuation requires pulling to at least how many microns?

Explanation:
Evacuation depth is about removing air and moisture from the refrigerant system, and it’s measured in microns of mercury. A practical target is to pull down to 500 microns or lower (a deeper vacuum confirms most moisture and non-condensables have been removed). Reaching 1000 microns would leave too much moisture or air, while 50 microns is deeper than typically needed for this purpose and can be harder to maintain in the field. So, 500 microns is the standard minimum depth to aim for before charging.

Evacuation depth is about removing air and moisture from the refrigerant system, and it’s measured in microns of mercury. A practical target is to pull down to 500 microns or lower (a deeper vacuum confirms most moisture and non-condensables have been removed). Reaching 1000 microns would leave too much moisture or air, while 50 microns is deeper than typically needed for this purpose and can be harder to maintain in the field. So, 500 microns is the standard minimum depth to aim for before charging.

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