What is the purpose of a secondary condensation line in an A/C unit?

The purpose of a secondary condensation line in an A/C unit is to provide a backup drainage system for water that accumulates in the condensation collection pan. When the main condensation line becomes clogged or obstructed, there is a risk that water could overflow from the pan, leading to potential damage to the A/C unit and surrounding areas. The secondary condensation line serves as a safeguard, ensuring that any excess water can still be directed away from the unit, thereby preventing situations that could result in leaks or water damage. This backup mechanism is crucial for maintaining the proper functioning and longevity of the A/C system, as it addresses issues that could arise from blockages in the primary drainage system.