Residential HVAC Installation Practice Exam

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Where is the electronic vacuum gauge attached to measure the pressure inside the system?

  1. Outside the condenser unit

  2. On the evaporator coil

  3. Inside the compressor

  4. Inside the system

The correct answer is: Inside the system

The electronic vacuum gauge is attached inside the system to measure the pressure. This is because the purpose of using a vacuum gauge is to measure the pressure levels within the HVAC system, specifically during evacuation and refrigerant charging processes. Placing the gauge inside the system allows for a more accurate reading of the pressure levels directly within the components where it is needed. Placing the gauge outside the system, on the condenser unit, on the evaporator coil, or inside the compressor would not provide an accurate representation of the pressure levels inside the system during these critical processes.

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