HVAC Journeyman Practice Exam

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What is the required air flow sequence in a system when not otherwise specified?

  1. Bypass duct first

  2. Cooling coil first

  3. Diverter unit first

  4. Heat exchanger first

The correct answer is: Heat exchanger first

In an HVAC system, the required airflow sequence is crucial for ensuring efficiency, proper temperature control, and system reliability. When the airflow sequence isn't specified, the preferred order typically starts with the heat exchanger. The heat exchanger is responsible for transferring thermal energy between two or more fluids. Starting with the heat exchanger allows the conditioned air to begin its temperature regulation process early in the system. This facilitates an effective heating or cooling process before the air moves on to other components, such as cooling coils, diverter units, or bypass ducts. This sequence ensures that the air is optimally conditioned as it progresses through the system, improving energy efficiency and maintaining comfortable indoor conditions. The design often prioritizes heat exchange to manage temperature effectively before any additional processes occur, thus highlighting the importance of airflow starting with the heat exchanger.

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