What is the purpose of a condensation drain in an HVAC system?

The primary function of a condensation drain in an HVAC system is to remove excess moisture from the system. When the air conditioning system operates, it cools the air, which causes moisture in the air to condense on the evaporator coils. This process is analogous to how water droplets form on a cold glass when moisture-laden air comes into contact with it.

The condensation that forms on these coils must be properly drained away to prevent water from building up, which could lead to problems such as mold growth, water damage, or decreased system efficiency. The drain directs this condensate safely away from the unit, ensuring that the system operates effectively and reducing the risks associated with excessive moisture accumulation. This functionality is crucial for maintaining indoor air quality and the longevity of the HVAC system by preventing water-related issues.

The other options do not align with the role of a condensation drain. Filtering cool air and increasing humidity levels contradict the purpose of draining excess moisture, while circulating refrigerant pertains to a different aspect of the HVAC system, specifically the refrigerant cycle. Therefore, the importance of efficiently removing excess moisture through the condensation drain is vital for a healthy and effective HVAC operation.