Residential HVAC Installation Practice Exam

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What micron gauge reading indicates a deep vacuum in a refrigeration system?

  1. 100 or below

  2. 250 or below

  3. 500 or below

  4. 750 or below

The correct answer is: 500 or below

A micron gauge reading measures the level of vacuum in a refrigeration system. The lower the reading, the deeper the vacuum. A reading of 500 or below indicates a deep vacuum, which is the desired state for a refrigeration system to function properly. Options A, B, and D would still be considered acceptable vacuum levels, but they are not as deep as a reading of 500 or below. Therefore, they may not be optimal for the system.

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