What is the best method to prevent condensate pan problems when installing a rooftop heating and cooling unit?

Trapping the drain line is the best method to prevent condensate pan problems when installing a rooftop heating and cooling unit because it ensures that the condensate can flow properly while also preventing the backflow of air into the pan. A properly installed trap in the drain line creates a barrier that keeps sewer gases from entering the unit and minimizes the risk of clogs. This ensures that any condensate from humidity is effectively drained without causing overflow or leakage, which can lead to further issues such as water damage or mold development.

Other options may offer limited benefits. Sealing the pan with silicone might provide a temporary fix but doesn't address the root cause of drainage issues. Insulating the ductwork primarily deals with thermal efficiency and can affect condensate formation but doesn’t directly address pan overflow problems. Installing a larger pan can seem like a solution, but if the drain line is not properly trapped, a larger pan may still experience overflow, defeating the purpose of increasing its size. Proper drainage practices, including trapping the drain line, are critical for preventing condensate-related issues in HVAC systems.