What is the minimum evacuation level for a 1000-pound system using R-407C?

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Multiple Choice

What is the minimum evacuation level for a 1000-pound system using R-407C?

Explanation:
Removing air and moisture from the system before charging is essential, especially with moisture-sensitive refrigerants like R-407C. For a large, 1000-pound system, the minimum evacuation level you should reach is ten inches of mercury vacuum. This depth ensures non-condensables and most moisture are removed to a safe level before charging. Evacuating to shallower levels (8 inches) wouldn’t meet the minimum, while deeper levels (12 or 15 inches) are more thorough than required by the question. So, ten inches of Hg is the threshold you’re expected to meet.

Removing air and moisture from the system before charging is essential, especially with moisture-sensitive refrigerants like R-407C. For a large, 1000-pound system, the minimum evacuation level you should reach is ten inches of mercury vacuum. This depth ensures non-condensables and most moisture are removed to a safe level before charging. Evacuating to shallower levels (8 inches) wouldn’t meet the minimum, while deeper levels (12 or 15 inches) are more thorough than required by the question. So, ten inches of Hg is the threshold you’re expected to meet.

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