EvoHome Beta 02.00.19.31 - HW Priority Setting

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  • mtmcgavock
    Automated Home Legend
    • Mar 2017
    • 507

    EvoHome Beta 02.00.19.31 - HW Priority Setting

    In the welcome beta email it briefly mentions about HW Priority dependent on your system set up but doesn't really expand on this

    'And finally…. Stored hot water priority and a hot water heating state if you use a Sundial central heating valve.'

    Could someone expand on this? As I believe i've got the correct set up (Zone valves, Boiler Relay etc) for this to work however it doesn't appear to be an option on my panel running the beta firmware.
  • bruce_miranda
    Automated Home Legend
    • Jul 2014
    • 2307

    #2
    Wasn't that a coming later feature, rather than a current beta one.

    Comment

    • mtmcgavock
      Automated Home Legend
      • Mar 2017
      • 507

      #3
      Originally posted by bruce_miranda View Post
      Wasn't that a coming later feature, rather than a current beta one.
      No it's included in the email as a new feature....I suspect you need certain hardware for it to show, but I figured I had the right hardware to do it.

      Comment

      • mtmcgavock
        Automated Home Legend
        • Mar 2017
        • 507

        #4
        So after some observation -

        It appears HW priority is just enabled - with no way to turn this on or off as you require. Can someone from Resideo confirm this?

        However think i've found a bug - i've got HW heating (And shown as heating on the new icon). All zones are at set point. When I override a zone to request for heat the HW switches off on the BDR91 (HW not to temp and new icon still showing as heating) and switches the heating BDR91 on - HW BDR91 goes off. So hot water not to temp and zone calling for heat seems to be overriding HW priority.

        Addition - Canceling zone override reverts back to HW.

        Must add too whilst HW wasn't fully to Temp (49oc, set point 55oc) it was within it's 7oc differential. Don't know whether this makes a difference...?

        Further info - changed HW temp to 65oc with a 5oc differential. When HW is at 54oc it doesn't call for heat when a zone is heating even though HW not at set point.
        Last edited by mtmcgavock; 2 April 2020, 03:11 PM. Reason: More info.

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        • mtmcgavock
          Automated Home Legend
          • Mar 2017
          • 507

          #5
          For anyone wondering going forward;

          HW Priority is enabled by default if you have a heating zone valve - if you've got this it can't be disabled. There is no On/Off in the settings.

          Current bug where if you manually override a zone the HW priority doesn't function correct but development team are aware.

          Comment

          • bruce_miranda
            Automated Home Legend
            • Jul 2014
            • 2307

            #6
            Could you describe how HW priority works in Evohome now.

            Comment

            • mtmcgavock
              Automated Home Legend
              • Mar 2017
              • 507

              #7
              Originally posted by bruce_miranda View Post
              Could you describe how HW priority works in Evohome now.
              So if you've got a heat demand on any of the zones that aren't HW, when the HW calls for heat it shuts down the 'Heating' BDR91 and opens the BDR91 for the HW. HW reheats and then the Heating BDR91 reengages and goes back to heating zones.

              Note - this is only if you've got two zone valves for Heating and HW. If you've got no zone valve for the heating and just HR92s (As Honeywell suggest) then it'll not work.

              Hope that is a good enough explanation?

              Comment

              • top brake
                Automated Home Legend
                • Feb 2015
                • 837

                #8
                Only applies if you have a 'HEATING VALVE' at system layer.

                Simply, when there is a hot water demand the Heating BDR will be de-energised.

                This effectively turns an S Plan into an X Plan, and a Y Plan into a W Plan - with no changes to the hydronics or valves. Neat!
                I work for Resideo, posts are personal and my own views.

                Comment

                • mtmcgavock
                  Automated Home Legend
                  • Mar 2017
                  • 507

                  #9
                  Originally posted by top brake View Post
                  Only applies if you have a 'HEATING VALVE' at system layer.

                  Simply, when there is a hot water demand the Heating BDR will be de-energised.

                  This effectively turns an S Plan into an X Plan, and a Y Plan into a W Plan - with no changes to the hydronics or valves. Neat!
                  Think it would have been nice to have an On/Off option though, especially when it's enabled by default. Least before you had the option of wiring the system as such.

                  As discussed with Andy; there's certain scenarios where it isn't ideal.

                  Comment

                  • DBMandrake
                    Automated Home Legend
                    • Sep 2014
                    • 2361

                    #10
                    Originally posted by mtmcgavock View Post
                    Think it would have been nice to have an On/Off option though, especially when it's enabled by default. Least before you had the option of wiring the system as such.

                    As discussed with Andy; there's certain scenarios where it isn't ideal.
                    Whoa a second. So this new hot water priority cannot be turned off ???! Please tell me this isn't true.

                    What is the reason for that ? It's definitely not appropriate to my system with a slow heating cylinder - I do not want hot water priority, and I actually even have an ABV in series with the indirect loop for the cylinder (to prevent it dropping the radiator differential pressure to zero) precisely so radiators and hot water reheat can work in parallel, and this works well for me.

                    If this new feature can't be disabled this is a big step backwards for me and anyone else will a slow reheat cylinder.
                    Last edited by DBMandrake; 3 April 2020, 04:46 PM.

                    Comment

                    • mtmcgavock
                      Automated Home Legend
                      • Mar 2017
                      • 507

                      #11
                      Originally posted by DBMandrake View Post
                      Whoa a second. So this new hot water priority cannot be turned off ???! Please tell me this isn't true.

                      What is the reason for that ? It's definitely not appropriate to my system with a slow heating cylinder - I do not want hot water priority, and I actually even have an ABV in series with the indirect loop for the cylinder (to prevent it dropping the radiator differential pressure to zero) precisely so radiators and hot water reheat can work in parallel, and this works well for me.

                      If this new feature can't be disabled this is a big step backwards for me and anyone else will a slow reheat cylinder.
                      Been trying to tell them that.......but it was a decision made by the 'sales' team. Needs to be made for On/Off. The amount of systems it'll not suit....well I could go on. Many systems i've done it'll just not work on or isn't required.

                      I've voiced my concerns though, I suggest others do the same.

                      But in summary - No you can't turn it off if you've got a Heating valve - So two 2 ports or a 3 port valve.

                      Comment

                      • bruce_miranda
                        Automated Home Legend
                        • Jul 2014
                        • 2307

                        #12
                        yup agree, forcing the option makes all S plans operate as Y plans.

                        Comment

                        • smar
                          Automated Home Sr Member
                          • Feb 2018
                          • 57

                          #13
                          Originally posted by top brake View Post
                          Only applies if you have a 'HEATING VALVE' at system layer.

                          Simply, when there is a hot water demand the Heating BDR will be de-energised.

                          This effectively turns an S Plan into an X Plan, and a Y Plan into a W Plan - with no changes to the hydronics or valves. Neat!
                          Is this also supposed to turn off UFH zones via HCC80R? If so, I am not seeing it on my setup, as the UFH zones lights are still on.

                          Comment

                          • DBMandrake
                            Automated Home Legend
                            • Sep 2014
                            • 2361

                            #14
                            Originally posted by mtmcgavock View Post
                            Been trying to tell them that.......but it was a decision made by the 'sales' team. Needs to be made for On/Off. The amount of systems it'll not suit....well I could go on. Many systems i've done it'll just not work on or isn't required.

                            I've voiced my concerns though, I suggest others do the same.
                            In the official beta firmware thread ?

                            Comment

                            • DBMandrake
                              Automated Home Legend
                              • Sep 2014
                              • 2361

                              #15
                              Originally posted by top brake View Post
                              Only applies if you have a 'HEATING VALVE' at system layer.

                              Simply, when there is a hot water demand the Heating BDR will be de-energised.

                              This effectively turns an S Plan into an X Plan, and a Y Plan into a W Plan - with no changes to the hydronics or valves. Neat!
                              Not neat if you have a system with a slow heating cylinder where you deliberately do not want hot water priority.

                              Please make hot water priority an on/off setting in the installer menu. It simply isn't a good idea for this to be enabled on all systems without a way of turning it off, and it is a significant change in behaviour to previous firmwares that is going to catch some people out even if it was on by default with a way to turn it off, let alone no way to turn it off.

                              Really it should be off by default after a firmware upgrade (for minimum end user surprise) with the ability to turn it on if it's applicable to the system and wanted by the owner or installer.
                              Last edited by DBMandrake; 3 April 2020, 05:24 PM.

                              Comment

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