We are thinking about install the Rachio controller in some of our rental properties. We currently have the Toro TMC controllers installed. Using the Rachio would give us more flexibility and efficiency. The only issue we have is that the our irrigation maintenance contractor has everything in place to maintain all our irrigation system via the Toro controller (remote controlled so they can perform maintenance anytime they want).
That being said, I was wondering if both controllers can be installed/wired in parallel so both could control the valves ?