Residential HVAC Installation Practice Exam

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What does the hiss indicate when removing rubber plugs from a line set during HVAC work?

  1. The tubing is leaking

  2. The tubing is expanding

  3. The tubing is contracting

  4. The tubing is not leaking

The correct answer is: The tubing is not leaking

When removing rubber plugs from a line set during HVAC work, the hiss sound typically indicates that the tubing is not leaking. This is because the hissing sound is a sign of pressure being equalized, meaning that the tubing is maintaining the same pressure without losing any air or refrigerant. The other options are incorrect because if the tubing was leaking, there would be a different sound, such as a whoosh or a hiss that quickly disappears. The tubing expanding or contracting would also not produce a hissing sound.

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