There are dedicated master zone and 24VAC output.
There is no need for any setup in the Yardian app.
Yardian (with camera)
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 go to the bottom of the My Yard card in the Main tab:
Click on the Master Valve then select the master zone. Now your Master Valve is specified and ready.
Please repeat the same steps to assign a 24Vac output zone.