You can assign any spare zone as the master/pump on Yardian. We suggest hooking up your master/pump to the last zone on your Yardian device. It can be easily set up as a "Master Valve" in the Yardian app.
Set Up in Yardian App
Please click the Yardian Device Setting card in the Home tab:
Select the Master Valve setting:
Select the zone then click Set:
Now your Master Valve is specified and ready.