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Hi does anyone know how the eph cp4m thermostat wires to the Tado v3+

Dizzie41
Dizzie41 ✭
in General Questions & Topics
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Does anyone know how this wires to the tado v3+

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Answers

  • policywonk
    policywonk ✭✭✭
    edited November 22
    Am a little lost. This seems to be a boiler that runs with a hot water tank in the building.
    1. Is this a combi or one which also drives a hot water tank?
    2. Have you contacted tado to get instructions?
    We can help identify the wire swap, but that may not be entirely effective or correct without more information.
    Meanwhile, from the pictures this is how one would transfer the wires:
    1. N (neutral) to P1 on the Tado
    2. L (live) to COM on the Tado
    3. pin 1 (com), that loop to L is discarded
    4. pin 4 (on) to NO in the Tado
    Look at this guide https://cdn.brandfolder.io/607DGEMS/as/7k4rssnm8hbmr6mjf94qmck/104210-DIGITAL-ST01IB01-INSTALLER_MANUAL-TA-EN-00-V3.pdf

    Go to page 4, implement the setup designed for R01.
    However, this is important, get Tado to confirm this via the app before you turn the power back on!
  • Dizzie41
    Dizzie41 ✭
    Hi, I have not long moved into a new build and it’s not a combo boiler. I have a separate thermostat for the hot water and I wasn’t going to do anything with that one. I’ve contacted tado and they have said it takes up to 2 days for a reply so thought I would try on here.
  • Dizzie41
    Dizzie41 ✭
    Thanks for your help
  • policywonk
    policywonk ✭✭✭
    edited November 22
    @Dizzie41

    Will explain. Whoever installed that thermostat was aware that your boiler can be controlled with Opentherm, a digital system which enables the boiler to run efficiently.

    They then strangely decided to wire the boiler in dumb on-off mode instead.

    So, if you can wait, please do, because if you could tell Tado that this boiler can be wired in Opentherm mode it will help you get the right instructions to check the wiring at the boiler, and at the thermostat and over a year save money because in this mode the boiler runs more efficiently.

    The alternative is if you don't have time, do you know an electrician who can study the installation manual for the boiler and make the changes for you? The guide is here:
    https://www.manualslib.com/manual/2905495/Ideal-Heating-Logic-Heat2-H12.html?page=30#manual
    Look at page 30.

    If not and you want to press ahead, Tados are versatile. With that map given above it should work and use the boiler in dumb mode as before. Then, later, do consider making the time in the next few months if you can to find out how to change the connections between the thermostat and the boiler and what to change in the settings in your app, so that you can operate that boiler more efficiently. It will save on your gas bill.

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