NATE Air Conditioning and Heat Pumps Practice Exam 2026 – All-in-One Guide to Master Your Certification!

The decision to use a running trap on a condensate line at the evaporator coil is influenced by the function of running traps in maintaining proper condensate drainage and air circulation. Running traps are specifically designed to effectively manage condensate accumulation while preventing air from entering the system during operation.

Running traps allow for continuous drainage of condensate, which is essential in maintaining efficient system performance. They prevent the buildup of water that could lead to operational issues, such as reduced heat exchange efficiency or even equipment damage due to water pooling. In draw-through applications where air is pulled through the evaporator coil, maintaining an airtight system is crucial. By preventing air from being drawn into the air handler, running traps help maintain the system's efficiency and reliability.

In contrast, using P-traps may not effectively prevent air intrusion, which can disrupt the airflow necessary for optimal refrigeration or heating performance. Therefore, the critical relationship between running traps and air management at the evaporator coil supports their use and emphasizes their role in ensuring effective system operation.