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Replacing Honeywell ST9100C with Tado Wireless Receiver

michaelsage
michaelsage
in General Questions & Topics

Hi,

I currently have a tado wired smart thermostat that controls my radiators with tado TVRs. I'd like to add my hot water into the system. It is currently controlled with a Honeywell ST9100c (wiring picture attached). I think I am right in saying the tado wireless receiver is the right product. I am a bit confused as to how it would be wired correctly, could anyone offer any guidance please?

There are cables in the number 1 and number 4 terminals but nowhere else.

Thanks

Michael

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Answers

  • Montage
    Montage

    What exactly is confusing you?

  • michaelsage
    michaelsage
    tado.png

    Looking at the back of the add-on wireless controller, I am not sure what would go into HW COM. The supply seems obvious enough, and I am guessing that HW NC would be the wire from terminal 1 and HW NO would be the wire from terminal 4.

    I tried to look at the wiring in the app, unfortunately, until you have the device it doesn't seem possible to view the guides.

  • Montage
    Montage

    You can get all the guides here https://www.tado.com/all-en/professional-manuals

    You shouldn’t really be guessing as it’s mains voltage wiring.

    The most common wiring is one to the Com (common) and one to NO (normally open). Most systems don’t use the NC - marked as OFF on your old unit.

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