What is the purpose of the red wire on Carlin microprocessor controls?

The red wire on Carlin microprocessor controls serves the purpose of facilitating the post-purge function. In heating systems, particularly those using oil burners, the post-purge feature is designed to remove any unburned fuel that might remain in the combustion chamber after the burner has shut off. This is important for both safety and efficiency, as it helps prevent the buildup of hazardous gases and ensures that the combustion area is clean for the next startup.

The post-purge operation is a critical component of burner management, as it increases the overall reliability of the system and helps maintain optimal performance. By connecting to the post-purge wire, the control system can effectively manage the timing and operation of the purge cycle, thereby enhancing the safety of the heating system.