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  1. So you think that the OT Bridge has intelligence...

    So you think that the OT Bridge has intelligence built in to determine that a normal 10% Heat Demand from a zone is different from a Fail Safe 10% demand. Because as I mentioned and as can be seen...
  2. I too have the old TRVs in a box in the garage. I...

    I too have the old TRVs in a box in the garage. I trust them more than Evohome when I need to pull a radiator off the wall.
  3. The 128C is via the API (honeywell server). But...

    The 128C is via the API (honeywell server). But the ~21C is measured by a local HGI80 which shows that the zone valve was still publishing its accurate temperature but for some reason the controller...
  4. OT produced a heat demand during a comm failure...was that the fail safe?

    Woke up in the middle of the night to hear the boiler running, which was odd because the heating system has been Turned Off for while now. We have solar so even the HW is taken care of.
    What I...
  5. You could reconfigure the wired temperature input...

    You could reconfigure the wired temperature input to something else. Any way, the OT gateway can also run in stand alone mode. See http://otgw.tclcode.com/standalone.html#operation
  6. And that even has an input for an outside...

    And that even has an input for an outside temperature sensor
  7. On the HR80 too, I turn the geared wheel anti...

    On the HR80 too, I turn the geared wheel anti clockwise completely, then screw the base to the TRV (clockwise :-) and then turn the geared wheel clockwise till it touches the pin. Then I put the body...
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    In fact on eBay, all Center thermostats seem to...

    In fact on eBay, all Center thermostats seem to be listed with the Honeywell name in the title.
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    I would only get the HCC80 if ever there was a...

    I would only get the HCC80 if ever there was a need to split a single manifold into multiple zones.
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    Smart homes can be quite rigid

    Hear me out.

    My girls decided that their room was smaller than the Guest room so spent the half term relocating. The hard work was actually the easiest.

    What we didn't account for was moving...
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    Nest was in the news recently for exactly the...

    Nest was in the news recently for exactly the same reason. Their cloud service went down and people woke up to cold houses.
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    if the entire manifold is serving one heating...

    if the entire manifold is serving one heating zone, then electric actuators are completely unnecessary. They are only needed if individual runs are serving different rooms, which can be shut off from...
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    Most manifolds won't come with electric ...

    Most manifolds won't come with electric actuators. So it gets simpler. You just wire the BDR91 to open the zone valve feeding the manifold, that in turn switches on the UFH pump. The T87RF becomes...
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    Yes that will work, but that adds another link to...

    Yes that will work, but that adds another link to the chain. You need to then send the Max Flow temperature OT command to the Viessmann.
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    Viessmann with Honeywell OT will make your boiler...

    Viessmann with Honeywell OT will make your boiler reach for the lofty highs of 85+C. I don't think you want that. Go back to using a BDR91 as your boiler controller.
  16. Do you have an indication to know what the...

    Do you have an indication to know what the current heat output is? I was only able to derive this once I was monitoring the eBUS.
  17. In my case, my boiler was specced too large. My...

    In my case, my boiler was specced too large. My Alpha2 pump and the 22mm heating loop are not man enough to take the heat away from the boiler fast enough. The boiler was originally meant to do a lot...
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    You don't even need to invest in electronic...

    You don't even need to invest in electronic actuators. Just leave the manifold manual ones on. As long as each circuit run is about the same length and they are all serving the same zone, then you...
  19. I have a 438 which doesn't have the Auto KW...

    I have a 438 which doesn't have the Auto KW setting. I have the boiler set to 18KW max. And most of the time it never uses that. To my pleasant surprise, the boiler appears to modulate to a lower...
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    I always thought that doing away with the grill...

    I always thought that doing away with the grill on the HR80 behind which is the temperature probe, was a step backwards on the HR92.
    I have used another HR80 I had around as a remote sensor. Works...
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    I too have a custom quick action that takes all...

    I too have a custom quick action that takes all rooms to 25C. Not that I ever want it to get there. I also comes handy when you need the system circulating completely, during a boiler service or...
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    I can confirm that the Arduino circuit mentioned...

    I can confirm that the Arduino circuit mentioned above works absolutely fine. But is READ only. So you will get the ebus data. You will still need software like ebusd or similar to actually make...
  23. You can absolutely do this. But then you've just...

    You can absolutely do this. But then you've just bought a very expensive room thermostat.
  24. Once you can listen to the Evohome messages, the...

    Once you can listen to the Evohome messages, the zone valve devices already have the Heat demand aggregated according to the Honeywell algorithms.
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    Whenever you run the boiler, the created heat has...

    Whenever you run the boiler, the created heat has to go somewhere. So you need to decide, it either goes into the tank, the radiators or infact cycle back to the boiler. The more heat you can extract...
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