In a three-wire primary, what does the orange wire connect to?

In a three-wire primary setup, the orange wire is typically used for multifunctional roles, which may include connections to various components within the system. This design allows for a single wire to serve multiple connections or functions, facilitating easier installation and maintenance. The reference to "everything" highlights that the orange wire could potentially connect to several different parts of the system, such as the transformer, burner unit, or primary control, depending on the specific configuration of the heating system.

This multifunctionality is advantageous, as it can streamline wiring and reduce the number of wires needed, thereby minimizing confusion during both installation and troubleshooting. Therefore, understanding that the orange wire connects to multiple components helps technicians identify and solve issues related to electrical connections in oil heat systems more efficiently.