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Thread: Evohome + Opentherm v Evohome + Boiler Outside Weather Compensation

  1. #81
    Automated Home Legend paulockenden's Avatar
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    Quote Originally Posted by HenGus View Post
    My system is as you describe. Two motorised valves and 2 BDRs. The HW BDR was part of the HW kit connected to an unvented system. When Paul suggested that something was amiss, I went up stairs with controller in hand and turned on the HW. The BDR light illuminated and the valve opened. The HW valve remained shut. I repeated the exercise with the Htg BDR and the valve motored and the HW valve remained shut. At this point, it got tricky as both outlet pipes were hot.

    I have just been up again. The HW is ON on the Evohome timer and the BDR green light is ON. The Htg BDR green valve is OFF and the CH motorised valve is closed. As I type, the Hot water has just reached temperature, the BDR green light has gone OFF and the motorised valve has closed. The pump and boiler have shut down.
    To me that suggests that your CH BDR isn't bound as a boiler relay. Else it would also be switching on with the DHW.

    I think you just need to set Boiler Control to None in the menus, and you'll be sorted.

  2. #82
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    I don't think the CH BDRs are double bound because 'we' still don't know of to bind the CH BDR as anything other than the Boiler Relay which is set via the Boiler Demand.

    I didn't think the BDRs could be bound to more than 4 devices so it can't even be that you have to bind the BDR as an acuator for every HR92 zone too.

    So @paulockenden please elaborate how you bind the CH BDR to any of the HR92 radiator zones without it being bound as a System Device->Boiler Demand.

    Forget about Stored Hot Water Configuration for the moment.

  3. #83
    Automated Home Legend paulockenden's Avatar
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    Quote Originally Posted by bruce_miranda View Post
    So @paulockenden please elaborate how you bind the CH BDR to any of the HR92 radiator zones without it being bound as a System Device->Boiler Demand.

    Forget about Stored Hot Water Configuration for the moment.
    You can't forget about Stored Hot Water, because that's where the CH BDR is bound. They've just changed the names of the old Sundial menus.

  4. #84
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    Quote Originally Posted by paulockenden View Post
    You can't forget about Stored Hot Water, because that's where the CH BDR is bound. They've just changed the names of the old Sundial menus.
    Paul, don't forget Bruce doesn't have the 'evohome Hot Water Kit' so doesn't have access to the 'STORED HOT WATER CONFIGURATION' menu currently.

  5. #85
    Automated Home Legend paulockenden's Avatar
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    Quote Originally Posted by The EVOHOME Shop View Post
    Paul, don't forget Bruce doesn't have the 'evohome Hot Water Kit' so doesn't have access to the 'STORED HOT WATER CONFIGURATION' menu currently.
    I'm getting very confused now - I thought we were talking about S-Plan. How can you have S-Plan without the hot water kit?

  6. #86
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    Quote Originally Posted by paulockenden View Post
    I'm getting very confused now - I thought we were talking about S-Plan. How can you have S-Plan without the hot water kit?
    You can have external controls still controlling the Hot Water system. Some people still do this and use evohome as just the heating controller only (with or without HR92's). A lot of people are being confused here when there is no need.

  7. #87
    Automated Home Legend paulockenden's Avatar
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    In that case I apologise. When S-plan was mentioned I assumed that Evohome was controlling all of it, as per the install instructions, not just half of it.

    Is that half and half approach still going to work with Opentherm?

  8. #88
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    Quote Originally Posted by paulockenden View Post
    In that case I apologise. When S-plan was mentioned I assumed that Evohome was controlling all of it, as per the install instructions, not just half of it.

    Is that half and half approach still going to work with Opentherm?
    No, need to apologise Paul. Bruce mentioned earlier he didn't have the Hot Water Kit and Top Brake said he would need to have the Hot Water Kit if he was going to use the OpenTherm Bridge - http://www.automatedhome.co.uk/vbull...ll=1#post26692

  9. #89
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    Having now followed Paul's advice and deleted the CH wireless relay etc, I am now even more confused. There is now no mention of anything to do with the boiler in the System Menus - so no settings for boiler cycle rate, minimum time etc. Both HW and CH are working fine. Do I just leave it as it is or re-set the CH to wireless relay? My confusion here is that I watched the installer cycle through these menus.

  10. #90
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    Is there a video or instructions that take you through the Hot water kit installation. Why would Honeywell put the CH BDR binding menu under the Hot water section. I would have thought the Hot water would take yoh through the HW BDR binding only.

    Anyway I would still be interested to know how HenGus' system is wired and bound.

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