Fan Center Relay Wiring Diagram. Fan on your furnace runs all the time and will not shut off. The first part of the installation is to install the electric fan to your radiator and remove the mechanical fan.

Electrical ponent 1 white rodgers 90 113 fan control center 2 dayton 1tdp3 75 cfm er or 1tdp7 150 1t. So your diagram black goes to relay com wire and blue goes to the relay n.o. Fuses must be able to carry starting loads