Total newbie: would like a multi zone heating system, please advise

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  • RedEarth
    Automated Home Sr Member
    • Jan 2021
    • 71

    #16
    Originally posted by Franco View Post
    Yes, it is a BDR91. (Left, mine; Right, Evo advert)

    [ATTACH=CONFIG]1927[/ATTACH] [ATTACH=CONFIG]1926[/ATTACH]

    The Evo manual that I have seen online mentions BDR91A100. , is it the same?

    Thanks
    Franco
    Yes, that's the same. My old one had the label on the front with the wiring instructions too. If your new kit comes with a BDR91 (depending on which package you buy), it'll already be paired, so you can save yourself the bother of the pairing/unpairing process by using the new one. It separates into 2 parts, the baseplate has the wiring terminals that connect it to the boiler and power supply, the front bit has the circuitry that communicates with the controller. So all you'd need to do is turn the power off, undo the single screw to remove the old BDR91's front section, replace it with the new one (leaving the original baseplate where it is, so no actual wiring work needed), power everything back up, run through the setup wizard on the new controller and that's the main part of your installation complete. All you'd need to do after that is pair your radiator controllers and fit them to the radiators (again an easy job that you could do yourself, no plumbing work needed as you say you already have TRV's).

    Comment

    • Franco
      Automated Home Jr Member
      • Feb 2022
      • 10

      #17
      OK, in this hyotetical situation:

      Combi boiler connected to BDR91, connecte to Evohome wifi controller. Five rooms, of which two have radiators fitted with HR92, and three with normal TRVs.

      Once the controller has been hooked to the HR92s, what happens to the rooms with normal TRVs? Which temperature will have them?

      Sorry to be so dumb

      Thanks
      franco

      Comment

      • RedEarth
        Automated Home Sr Member
        • Jan 2021
        • 71

        #18
        Originally posted by Franco View Post
        OK, in this hyotetical situation:

        Combi boiler connected to BDR91, connecte to Evohome wifi controller. Five rooms, of which two have radiators fitted with HR92, and three with normal TRVs.

        Once the controller has been hooked to the HR92s, what happens to the rooms with normal TRVs? Which temperature will have them?

        Sorry to be so dumb

        Thanks
        franco
        Not dumb at all, it's a valid question. Evohome will be demanding heat from the boiler whenever one of its configured zones is demanding heat, which in this case will be the two rooms that have the HR92's. If the boiler is running, any of the other rooms with the normal TRV's can also receive heat, and they'll close off once they get to their own set temperature. However if all the HR92-equipped rooms reach their desired temperature first then the Evohome will stop demanding heat from the boiler, so the non-HR92 rooms won't get any more heat either.

        But this is not much different to your current situation, whereby if the room containing your existing controller reaches the its required temperature, it'll stop demanding heat from the boiler, leaving the other rooms potentially cooler than they want to be.

        Comment

        • Franco
          Automated Home Jr Member
          • Feb 2022
          • 10

          #19
          Thanks
          Now it seems the way to go.
          Assuming that the Evo controller can work somehow in absence of any HR92, I would go for a stepwise approach.
          A- purchase just the controller plus BDR91, swap the top of the existing, and start using the controller as such
          B- in subsequent steps, add the HR92s three at the time. May be after prices have come back to normal levels.
          C- install all 8 HR92s needed.
          Does it sound sensible?
          Thanks
          Franco

          Comment

          • RedEarth
            Automated Home Sr Member
            • Jan 2021
            • 71

            #20
            Originally posted by Franco View Post
            Thanks
            Now it seems the way to go.
            Assuming that the Evo controller can work somehow in absence of any HR92, I would go for a stepwise approach.
            A- purchase just the controller plus BDR91, swap the top of the existing, and start using the controller as such
            B- in subsequent steps, add the HR92s three at the time. May be after prices have come back to normal levels.
            C- install all 8 HR92s needed.
            Does it sound sensible?
            Thanks
            Franco
            Sounds fine, that's much the same "upgrade path" that I followed. You just need to make sure that your first batch of HR92-equipped rooms in step B includes the room where the controller is located.

            Comment

            • Franco
              Automated Home Jr Member
              • Feb 2022
              • 10

              #21
              Thank you very much. Hope will go well.
              F

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