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Thread: Heating Partial Load

  1. #51
    Automated Home Legend
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    Quote Originally Posted by Wlife View Post
    has anyone figured out evohome opentherm r8810 with a worcester boiler yet? tried the nefit converter couldn't control the boiler firing so went back to bdr91. I too was trying to improve cycling/efficiency I've since changed some settings and seeing how it goes.
    With the nefit converter are you able to see variable Target Flows being set for the boiler based on OT? Because the work around which I previously used when I too couldn't get my Vaillant to fire with the R8810 was to set up the system with OT for boiler control and then a 2 zone valve configuration on Evohome. So Evohome would open the CH Valve using a BDR91 and then I would use the zone valve micro switch to fire the boiler, while the R8810 was dynamically setting the Target temperature.
    This all worked quite well, till I figured out how to get the R8810 to fire the boiler directly.

  2. #52
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    Quote Originally Posted by bruce_miranda View Post
    With the nefit converter are you able to see variable Target Flows being set for the boiler based on OT? Because the work around which I previously used when I too couldn't get my Vaillant to fire with the R8810 was to set up the system with OT for boiler control and then a 2 zone valve configuration on Evohome. So Evohome would open the CH Valve using a BDR91 and then I would use the zone valve micro switch to fire the boiler, while the R8810 was dynamically setting the Target temperature.
    This all worked quite well, till I figured out how to get the R8810 to fire the boiler directly.
    thanks for the response Bruce.

    Yes I could see variable flow targets on the boiler display and it wouldn't continuously climb as it does with the bdr91 controlling it.
    Forgive my lack of knowledge my setup is a combi I do not have any zone valves I am using hr92s on rads. I am open to adding the zone valve it seems a good workaround are their any drawbacks to this method?
    How did you get your boiler to fire directly with the R8810? my boiler is a WB life 8000 combi.
    Would you say the CH/Evohome is working better now via opentherm, I read the financial savings are slim but even from a comfort/function point of view it must be better.

  3. #53
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    you dont need the actual zone valve. You just need to configure Evohome to think you have a CH and DHW zone valves and then you use the BDR91s to fire the boiler.

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