Residential HVAC Installation Practice Exam

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What does a multiple evacuation involve in relation to a refrigeration system?

  1. Introducing noncondensable gases

  2. Performing maintenance

  3. Using a single vacuum cycle

  4. Pulling a vacuum more than once with intervals

The correct answer is: Pulling a vacuum more than once with intervals

A multiple evacuation, in relation to a refrigeration system, involves pulling a vacuum more than once with intervals. This process is crucial for ensuring that all moisture, air, and other non-condensable gases are properly removed from the system. Each subsequent vacuum cycle helps to further evacuate any contaminants that may still be present, ultimately leading to a cleaner, more efficient system. By repeatedly pulling a vacuum with intervals, technicians can help prevent issues such as system inefficiency, component damage, and system breakdowns due to the presence of moisture and non-condensable gases.

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