The red wire on Carlin microprocessor controls serves what purpose?

The red wire on the Carlin microprocessor control serves the purpose of post-purge. Post-purge is a critical safety feature in oil heating systems. After the burner shuts off, the post-purge function allows the blower to continue running for a specified period. This helps to clear any residual combustion gases from the heat exchanger, ensuring that the system is safe and reducing the risk of carbon buildup or flue gas condensation.

By handling the post-purge task, the red wire plays a crucial role in maintaining system efficiency and safety. Proper post-purge operation helps protect the components from overheating and enhances the longevity of the system. Therefore, knowing this function is essential for an oil heat technician, as it directly impacts both performance and safety.