NOTE: Complete this section only if you have a pump start relay installed. A pump start relay is a device that uses a signal from the controller to actuate a separate electrical circuit to energize a pump to provide water to your system.
The controller should be mounted at least a 15 ft (4.5 m) away from both the pump start relay and pump to minimize any potential electrical interference.
Route a pair of wires from the pump relay into the controller.
Connect a common wire to the C (Common) terminal inside the controller and connect the remaining wire from the pump start relay to the MV terminal.