Which of the following statements is true about the main condensate line?

The main condensate line is responsible for transporting condensate (water) from the evaporator or cooling coil to a drainage point, usually a sewer or a condensate pump. One important aspect of the main condensate line is that it requires a trap to prevent the backflow of sewer gases into the building. This trap acts as a barrier, allowing condensate to drain freely while keeping unpleasant odors and potential contaminants from entering the living space.

Using a trap is essential because it maintains an airtight seal by leveraging the water's weight. This prevents gases from traveling back through the line into the air-conditioned or conditioned space. Furthermore, a properly installed trap ensures that the condensate can flow away from the system effectively while maintaining proper pressure within the drainage system.

While other statements may have relevance in specific contexts, they do not accurately represent the function and requirements of the main condensate line in general. For example, having a solid connection to the sewer line or being sloped towards the condenser only does not address the critical role of the trap in preventing backflow and ensuring system integrity. Therefore, understanding the necessity of a trap is pivotal for maintaining both health and operational efficiency in HVAC systems.