HVAC Journeyman Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

The primary purpose of a sediment trap in fuel-gas lines is to catch debris and liquids. This device is strategically placed in the gas piping to effectively capture any particulates, such as dirt, rust, or water, that may be present in the gas supply. By trapping these contaminants, the sediment trap helps to protect downstream equipment and appliances from potential damage or malfunction caused by blockages or corrosion.

Maintaining the integrity of the gas lines and ensuring the efficient operation of appliances relies on having clean fuel gas free of impurities. Therefore, the sediment trap serves a critical role in promoting safety and efficiency in the overall gas distribution system. While enhancing efficiency and facilitating pressure balancing can be important functions in HVAC systems, they do not specifically relate to the sediment trap's design and purpose. Separating chemicals is also not relevant, as the sediment trap focuses solely on physical particulates rather than chemical separation.