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Type: Posts; User: lloyd

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    Opertherm and TPI at low flow temperatures

    I have an Intergas boiler connected to EvoHome with OpenTherm via an OpenTherm Gateway (for monitoring and control of maximum flow temperature). It works well, except when the demand gets very low,...
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    One of may hall radiators I just have a standard...

    One of may hall radiators I just have a standard TRV head on it. The same with my bathroom towel radiators. I'm pondering using a non Honeywell head that I can control via HA.
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    I also would suspect some form of RF...

    I also would suspect some form of RF interference. On a couple of occasions when I have had comms issues, it has been low batteries in either a CS92, or a DT92.
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    This thread suggests that if the DHW temp gets...

    This thread suggests that if the DHW temp gets down to 10 degrees then the system will start to heat the water.
    ...
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    Interesting. And potentially very useful.

    Interesting. And potentially very useful.
  6. This is one of the reasons why many of us monitor...

    This is one of the reasons why many of us monitor the evohome wireless messages via Home Assistant or other solutions. You can use this to not only see the current status, but also to look at what...
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    Documentation :D My understanding is the...

    Documentation :D

    My understanding is the temperature needs to drop by the offset before heating occurs again. So you are correct in your assumption that it needs to drop below 40 in your case.
    ...
  8. Thread: Optimised start

    by lloyd
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    Well that made no difference. I find it strange...

    Well that made no difference. I find it strange that some zones the optimised start is almost perfect, whilst others it is appallingly bad.
  9. I've not wall mounted mine, but would velcro be...

    I've not wall mounted mine, but would velcro be an option?
  10. Thread: Optimised start

    by lloyd
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    I think I used to have partial load scaling...

    I think I used to have partial load scaling enabled before i moved to opentherm. The settings for that are no longer available, do I can't see if it is enabled or disabled. Do you think there could...
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    Sounds like the controller is not talking to the...

    Sounds like the controller is not talking to the bdr91 on the hot water valve. Any Comms errors in the logs?
  12. Thread: Optimised start

    by lloyd
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    Whether you love it or hate it, I'd like to try...

    Whether you love it or hate it, I'd like to try and understand why it has started behaving so badly on my installation. I'm sure it used to work fine, but now it seems to turn things on as early as...
  13. Thread: Optimised start

    by lloyd
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    Can you expand on that, just to make sure that...

    Can you expand on that, just to make sure that I'm understanding what you mean by whole house?
  14. Thread: Optimised start

    by lloyd
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    Optimised start

    I'm having a few issues with optimised start, which seems to be getting worse. I'd like to improve my understanding of how this is controlled, and this is likely to throw up a few (or more :D)...
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    MULTIPLE is multi-room. With this configuration...

    MULTIPLE is multi-room. With this configuration each TRV acts independently to achieve the set point. I use this for a bedroom/en-suite, and also for hall/landing. I also have rooms with two or...
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    Usually this sort of a problem is a configuration...

    Usually this sort of a problem is a configuration issue. If the sensor for that zone is a TRV, try warming it with a hair dryer and see of the displayed temperature on the controller goes up. (In...
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    Also I think on a gen 2 the mains lead goes into...

    Also I think on a gen 2 the mains lead goes into the controller; on gen 3 there power adaptor plugged into the socket, and a low voltage plug into the controller.
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    Not an expert on the different models, but are...

    Not an expert on the different models, but are they not visually different, and in particular there is a bezel around the screen with the gen 2, but there is not one on a gen 3?
  19. If you have a zone with two or more radiators, it...

    If you have a zone with two or more radiators, it will display the temperature of the first one that is bound to the controller. You could also add a separate room sensor to the zone, such as a...
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    Any chance you could put a voltage regulator and...

    Any chance you could put a voltage regulator and any required additional components immediately behind the mount, and supply that with a voltage that has sufficient head room?
  21. I had thought about using a sensor with ramses_cc...

    I had thought about using a sensor with ramses_cc and HA to spoof the Honeywell sensor. But I'm always cautious of making my system dependant on HA. If you're solution is more standalone I'd be...
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    If anyone is interested, I've published my...

    If anyone is interested, I've published my scripts for better hot water priority with EvoHome using HA on the evohome_cc WiKi - https://github.com/zxdavb/ramses_cc/wiki/Hot-Water-Priority-by-@lloyda.
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    That is the other approach I am considering. The...

    That is the other approach I am considering. The overrides have to go back on when the HW reaches its setpoint. Adding an override during the HW heating time removes HW priority.
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    The only relatively simple work round that I am...

    The only relatively simple work round that I am considering is to use a 3rd BDR91 (or some other relay), controlled by HA, in series with the CH BDR91, using NC contacts. If I want priority HW, then...
  25. I think that is only available with the old...

    I think that is only available with the old style, non Wi-Fi versions of the controller. Real shame.
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