Automotive Service Excellence (ASE) Air Conditioner Certification Practice Exam 2025 – Your All-in-One Guide to Exam Success!

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How long should a technician wait after the recovery unit is off to check for residual pressure?

1 minute.

5 minutes.

Waiting for 5 minutes after the recovery unit is off allows enough time for any residual refrigerant pressure to stabilize in the system before measurement. During this waiting period, remaining vapor can migrate and equalize, which is critical for obtaining an accurate assessment of the system's pressure. This wait time helps ensure that what the technician measures is reflective of the system's true condition rather than transient fluctuations caused by the operation of the recovery unit.

In shorter time frames, such as 1 minute, there may still be movement and pockets of refrigerant that haven't fully settled, leading to misleading readings. A longer wait time may not be necessary and could be inefficient, as pressures tend not to change significantly beyond the 5-minute mark in a properly functioning system.

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10 minutes.

15 minutes.

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