What is the purpose of L1 on a six-wire primary system?

The function of L1 in a six-wire primary system is primarily associated with the ignition and combustion processes in oil heating systems. It is responsible for enabling the port purge operation, which is an essential safety feature. During the port purge cycle, fuel oil is prevented from flooding the combustion chamber and ensures that any unburned fuel is cleared before ignition. This helps to mitigate the risk of explosion or delayed ignition, creating a safer operating environment.

By allowing the flow of air into the combustion chamber for a specific period before the burner ignites, L1 plays a crucial role in preparing the system for efficient operation. Ensuring a clean start reduces emissions and enhances overall system efficiency. Understanding this function emphasizes the importance of each wire in the system and reinforces the need for proper setup and maintenance in oil heating systems.