I’ve got a subsurface drip irrigation system and I don’t have to worry about freezing the drip lines, but I think I froze my backflow preventer - which leads me to start to think about how to be able to “set and forget” my system to drain.
My current idea is to add a master valve to turn off the supply to all zones, using the Rachio to automatically open the valve. That can be used 100% of the time.
But I’d also like to have the system automatically drain the supply line when the temp drops below 32 outside.
Is there a simple way to have the Rachio do that for me? All I’d need to do is have another valve which stays closed except for 5 minutes or so when it’s freezing outside to allow the supply lines to drain.
Ideas about how to do that?