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Thread: 'S' Plan - Set Up. Port Valve or Wireless Relay?

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    Default 'S' Plan - Set Up. Port Valve or Wireless Relay?

    Having looked back to some notes that I took at the time, it would seem that my original installer set up the CH side of my 'S' plan using the boiler relay option. I have now followed advice - both on this forum and in Richard's video - and re-built the system using the port valve option. Both configurations work. Can someone tell me what changes for the better with the port valve set up compared to using the BDR91 as a wireless relay? Clearly, with the preferred solution all reference to boiler cycle rates are lost. I recall that this was a discussion that my installer had with me at the time (but it was nearly two years ago).

    Blame my curiosity on 36 years spent in the air!

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    Yeah, this is something that I don't think is all that well documented on EvoHome, what each of the guided config setups then sets up for you and what design it should be used for. Also, there are no application notes that show a design, what config setup to use, what manual bindings you could use and then what the System Report should then look like.

    Anyway, from what I understand if you setup with a S-Plan, 2 x 2 port valves setup, then when Hot water calls for demand it will open the Hot water BDR91, when Radiator valves call for Heating, it will open the Heating BDR91.

    If there is a Boiler Relay set, then if anything calls, then it opens the BDR91 bound to it. And that is whether it is hot water, or heating.

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    Automated Home Legend paulockenden's Avatar
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    But we've been told via these forums that 3 x BDR91 system that you are suggesting (DHW, CH and Boiler Relay) isn't a supported configuration and may not work.

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    Quote Originally Posted by paulockenden View Post
    But we've been told via these forums that 3 x BDR91 system that you are suggesting (DHW, CH and Boiler Relay) isn't a supported configuration and may not work.
    I don't disagree, but I only have two motorised valves and 2 BDRs. HW was set up as per Richard's video, and CH set up was by selecting wireless relay and binding the 2nd BDR to it. The two BDRs under the non-recommended setup worked independently of each other depending on whether there was a HW or CH demand. I found no evidence of any double binding with either of the 2 BDRs opening both valves.
    Last edited by HenGus; 5th April 2016 at 10:47 AM.

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    Quote Originally Posted by paulockenden View Post
    But we've been told via these forums that 3 x BDR91 system that you are suggesting (DHW, CH and Boiler Relay) isn't a supported configuration and may not work.
    I was not implying DHW, CH and BR. That is not a supported design from the diagrams in the user guide. I was simply saying that if a BR is set then if anything calls, then it turns that BDR on. For a S-Plan design, you would not have a boiler relay and so you should not have anything bound to this.

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    Quote Originally Posted by HenGus View Post
    Having looked back to some notes that I took at the time, it would seem that my original installer set up the CH side of my 'S' plan using the boiler relay option. I have now followed advice - both on this forum and in Richard's video - and re-built the system using the port valve option. Both configurations work. Can someone tell me what changes for the better with the port valve set up compared to using the BDR91 as a wireless relay? Clearly, with the preferred solution all reference to boiler cycle rates are lost. I recall that this was a discussion that my installer had with me at the time (but it was nearly two years ago).

    Blame my curiosity on 36 years spent in the air!
    Please remind me how the heat demand is wired?
    I work for Resideo, posts are personal and my own views.

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    Quote Originally Posted by top brake View Post
    Please remind me how the heat demand is wired?
    I wish I knew. Each to his own: this is why I paid an Evohome specialist installer to do all the installation work. As I have said previously, both CH set up solutions work. The HR92 demands heat; the motorised valve opens and the boiler fires up. If it helps, the installer left the original programmer in place. It does nothing more than tell the time.

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    Quote Originally Posted by HenGus View Post
    I wish I knew. Each to his own: this is why I paid an Evohome specialist installer to do all the installation work. As I have said previously, both CH set up solutions work. The HR92 demands heat; the motorised valve opens and the boiler fires up. If it helps, the installer left the original programmer in place. It does nothing more than tell the time.
    sounds like you have a wired S Plan system.

    So the only negative of having the heating valve connected to a boiler relay is that the heating valve will open when you get a hot water demand

    but you will gain adjustable cycle rate/run time

    I have retrofitted a few S Plans exactly like this when there is an oil boiler
    I work for Resideo, posts are personal and my own views.

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    Quote Originally Posted by top brake View Post
    sounds like you have a wired S Plan system.

    So the only negative of having the heating valve connected to a boiler relay is that the heating valve will open when you get a hot water demand

    but you will gain adjustable cycle rate/run time

    I have retrofitted a few S Plans exactly like this when there is an oil boiler
    Thanks TB - but it doesn't. With the CH set up as wireless relay, I had my hand downstream of the CH valve and I turned on the HW demand. There was no flow around the CH circuit. When I turned off the HW demand, only the HW valve 'whirred' as it closed.

    The CH is now set up as per the Guided path through the hot water valve sequence and it came on as expected this morning and went off at the right time. Should I now just leave it as it is?
    Last edited by HenGus; 5th April 2016 at 05:24 PM.

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    Automated Home Legend paulockenden's Avatar
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    It sounds like your controller thought it had a Boiler Relay bound, but it didn't (I've noticed that the controller doesn't moan about a comms failure in this scenario). Everything would have still worked because the boiler was being fired off the back of the two port valves. The Evo controller just thought it had more control over the system than it really did.

    I've often wondered whether to spoof this on my own S-Plan system, just so I can fiddle with those extra parameters that aren't normally available. I realise the timings would be wrong, though, because of the (sometimes quite unpredictable) delay involved in the valve opening before the boiler is activated. However, I guess it's probably best to stick to 'officially supported' configurations.
    Last edited by paulockenden; 5th April 2016 at 05:29 PM. Reason: clarity

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