Complete this section only if you have a master valve installed in your irrigation system. A master valve is a “normally closed” valve installed at the supply point of the main line that opens only when the controller initiates a watering program.
At the Master Valve, attach the common wire to either solenoid wire of the valve. Attach a separate control wire to the remaining solenoid wire.
The common wire should be attached to the C terminal inside the controller. The other wire coming from the master valve should be attached to the P terminal inside the controller. Tighten each terminal screw.