Rain Dial to Rachio Wiring

post by curious on Jul 21, 2024

I am a little confused as my Rain Dial has two wires red and yellow that go to the 24 VAC. I haslve seen post that you should and shouldn't wire to the Rachio this way and should be capped? Shouldn’t it be wired?

I do not know what wire is my C and if I have an M wire? Can you help clarify this? I think the white wire is the VC.

What do I do with the yellow and green wire in the earth ground slot? Where would this tie to?

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post by Thomas_Lerman on Jul 21, 2024

I believe the red, yellow, plus the yellow with green are going to the transformer to power the controller & valves. These will not go to the Rachio. In the case of Rachio, you would just use the supplied power adapter. The VC with the thin white wire is the "Valve Common" which will go to ‘C’ on the Rachio. It looks like you currently have three zones (1-3). I do not see anything going to the Pump / Master Valve terminal. The bridge for the sensor means you do not have one. I suggest double checking to make sure all valves are working before switching. It looks like a pretty easy switch. Please feel free to post pictures afterwards, ask questions, and ask for help with all the settings in the app.

Reference to the Rain Dial: https://cdn2.toro.com/en/-/media/Files/Irritrol/products/controllers/rain-dial-r-series/373-0538V_d.ashx