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  1. Replies
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    No thread, it was a direct conversation. But you...

    No thread, it was a direct conversation. But you can reach out to notorious on there - just PM him.
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    It'll only go so far. The actual gas valve...

    It'll only go so far. The actual gas valve assembly is different and the PCB setting needs to be adjusted in d.93:

    https://www.urbanplumbers.co.uk/vaillant-eco-tec-f-70-fault-code/

    The guy on...
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    In theory, all modulating boilers should cope...

    In theory, all modulating boilers should cope with differing heat demands. In practice, being able to reduce the KW rating (on a Vaillant especially) can aid with the boiler not overshooting.
    ...
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    Totally agree, hence my point about a LLH making...

    Totally agree, hence my point about a LLH making everything behave much more predictably. The LLH handles the minimum flow rates through the boiler, without having to have the compromise of an ABV...
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    The boiler size isn't dictated by the UFH and /...

    The boiler size isn't dictated by the UFH and / or number of radiators, though. It's dictated by the heat loss of the house (in the depths of winter). The UFH/rads are then sized to meet that minimum...
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    Do you have an Automatic Bypass Valve? It needs...

    Do you have an Automatic Bypass Valve? It needs to be set correctly to maintain the minimum flow through the boiler.

    Honestly, I would advise just biting the bullet and having a Low Loss Header...
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    The VR66 is considerably bigger than I was...

    The VR66 is considerably bigger than I was expecting. And just like you said above, I was thinking "what a waste" - none of the functionality is being used except the HW ebus command being sent via a...
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    Nice one - thanks for confirming. So just to...

    Nice one - thanks for confirming.

    So just to confirm for anyone else looking to do this, all that is needed to activate HW mode on the VR65/VR66 is provide a 230V live to the right hand CYL...
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    Hooked up the VR66 today - I think it's working!...

    Hooked up the VR66 today - I think it's working!

    Just want to confirm though - how do you know the HW demand has been activated? I see the tap symbol flashing on the front display and d.22 Hot...
  10. Bruce, speaking to notorious on diynot, he said...

    Bruce, speaking to notorious on diynot, he said d.78 sets the HW flow temp *regardless of what the CH knob on front of the boiler is set to*.

    This would mean a vr65 alone would allow setting HW...
  11. What is the purpose of d.77? I understand it...

    What is the purpose of d.77? I understand it allows you to lower the kW output for HW, but I've always found my boiler automatically modulates down when heating my megaflo (which I believe has a 22kw...
  12. Thanks Bruce for collating this info in one...

    Thanks Bruce for collating this info in one place.

    mtmcgavock, I don't have evohome, but I do want to use weather comp with my on/off controls (nest multi zone). The VR65 will allow this (by...
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    This is what I'm not getting. The guy on diynot...

    This is what I'm not getting. The guy on diynot is adamant that:

    1. Terminals 3+4 are not linked. He uses SL from his motorised valves to 4 for central heating only.

    2. The DHW motorised valve...
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    Thanks for confirming Bruce. Just waiting on my...

    Thanks for confirming Bruce. Just waiting on my VR66 and VRC 470f to try this.

    Another couple of questions, if I may, as you understand how ebus works very well:

    1. The user on diynot has a 428...
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    I think I understood what you were saying now....

    I think I understood what you were saying now. Use the live going to the DHW zone valve to feed the CYL terminal (whichever needs voltage on it).

    That live will be coming from the megaflo overheat...
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    Argh, actually thought this through, and that...

    Argh, actually thought this through, and that presents a problem.

    If CYL+ always provides 230V, then I cant connect it to SL, as it will fire the boiler.

    If I do it the other way, and put the...
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    That's great info. Thanks very much.

    That's great info. Thanks very much.
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    Thanks Bruce. I'm actually thinking of using the...

    Thanks Bruce. I'm actually thinking of using the grey/orange (230V mains voltage) directly on the VR65 CYL terminals. Even though the orange will backfeed from the other zone valves, only the DHW...
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    Right, revisting this thread, as a user on diynot...

    Right, revisting this thread, as a user on diynot managed to get SL working with weather compensation and boosting DHW temp using a VR65/VR66:
    ...
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    Don't have time to reply to all your qs, but one...

    Don't have time to reply to all your qs, but one thing I did notice with the wiser thermostats is that the room stat is usually a good degree lower than the radiator stat.

    Obviously largely...
  21. Wow - a lot of questions. I'll try and answer as...

    Wow - a lot of questions. I'll try and answer as best I can. I've had the Wiser kit fitted for only a few days.



    It depends on your setup. I assume you have 2 motorised valves. If every...
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    Yes sure - do you have domoticz installed on...

    Yes sure - do you have domoticz installed on Windows? I run mine in Docker, so it was slightly more complicated, but on Windows should be relatively easy.

    Once installed, download the Drayton...
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    Forgot to update here - this was, of course, due...

    Forgot to update here - this was, of course, due to TPI. Missed that.
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    So I setup domoticz last night and a dashticz...

    So I setup domoticz last night and a dashticz dashboard - all the zones can be displayed and adjusted from it (!). Opens up a load of possibilities with regards to having a wall mounted display in...
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    Finally taken the plunge with Wiser, with the...

    Finally taken the plunge with Wiser, with the amazon deal yesterday.

    Ordered the 3 zone kit (2 x CH + 1 x HW) and 10 TRV's for downstairs. Another 11 TRV's for upstairs are coming in a week, but...
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