Existing Hardie HR-6100 compatible with Rachio 3?

post by flap1004 on Aug 9, 2024

Hi,

I’m considering replacing existing Hardie HR-6100 with Rachio 3.

Is it possible to check if my existing controller is compatible?

If so, which wire goes to where in Rachio 3 configuration?

Thanks!

post by tmcgahey on Aug 9, 2024

Should be fine…hard to tell from the angle of your picture, but looks like you have 5 zones? Those would attach to corresponding zones in Rachio. I can’t quite tell where the white and brown wires are ending, but the white should be your common, which will attach to “C” terminal on Rachio. They COULD have used a brown wire for a second common, or that could be going to the neighboring “M” terminal, which would be for a master valve, which would attach to the M terminal of Rachio. The last 2 wires would not be used, as that is what is supplying power to the HR-6100 and Rachio will use the supplied barrel connector.

post by flap1004 on Aug 9, 2024

Thanks! Both white and brown are used for COM. There was no wire on ‘M’.

In this case, do I still need to attach brown one to ‘C’ along with white (which means ‘M’ will be empty in Rachio)?

post by tmcgahey on Aug 9, 2024

Possibly/probably. If you have multiple valve boxes in your yard, the white and brown might run to different locations.

If you have nothing attached to the M on your current controller, then you wouldn’t have anything on the Rachio either.