What is the role of a drain pan connected to a cooling coil in a furnace?

The role of a drain pan connected to a cooling coil in a furnace is primarily to collect excess water that can accumulate due to condensation. When the cooling coil operates, moisture from the air condenses on the coil's surface, and it is essential to manage this condensate to prevent water damage to the unit or surrounding areas.

A properly sized drain pan helps ensure that it can effectively handle all potential condensate produced by the cooling coil. Designing the drain pan to accommodate the entire unit allows for adequate water collection without overflow, contributing to the overall efficiency and safety of the system.

By focusing on the functionality of the drain pan in relation to the specific cooling coil, it becomes evident that understanding the capacity and flow management of drainage is crucial for preventing issues such as leaks or water damage, which is vital for maintaining a well-functioning HVAC system.