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  1. Replies
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    I can't remember what it's called because I set...

    I can't remember what it's called because I set mine up several years ago. But it's hiding in there somewhere! It's the "normal" setup for S-plan - BDRs connected to the CH valve and the DHW valve...
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    This is incorrect. You shouldn't have a BDR...

    This is incorrect. You shouldn't have a BDR configured as boiler control unless it is DIRECTLY connected to the boiler. Your boiler is controlled by the switches in the zone valves. In this case,...
  3. The biggest challenge is actually knowing that...

    The biggest challenge is actually knowing that they need replacing! Unless you happen to glance at the controller screen, or the HR92 display, you have no way of knowing. It would be nice if...
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    That's not strictly true. Before I upgraded to...

    That's not strictly true. Before I upgraded to OpenTherm, I had one BDR on my hot water cylinder, and one controlling my boiler. There is no central heating valve on my system, so the installer used...
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    I can't be certain from your description, but it...

    I can't be certain from your description, but it sounds to me like you have 1 BDR controlling the hot water valve to allow hot water into the hot water cylinder, and 1 BDR controlling the central...
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    If you don't have a BDR controlling the boiler,...

    If you don't have a BDR controlling the boiler, you probably shouldn't bind a BDR in the boiler control section! :)
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    It sounds like your hot water BDR is...

    It sounds like your hot water BDR is double-bound. Did you clear the bindings from all devices (BDRs, CS92, HR92s) when you reinstalled?
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    In reverse order: 3) Yes. In fact, this is...

    In reverse order:

    3) Yes. In fact, this is Honeywell's preferred setup. If you have HR92 TRVs on all radiators, you don't need zone valves. What would they add?

    (Side note: make sure you have a...
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    So how much will you charge to alter people's...

    So how much will you charge to alter people's HR92s for them, Clive? I have three that would benefit from improved reception!

    Also, I assume this works both ways - i.e. just improving reception...
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    And how does he do this on a traditional system?...

    And how does he do this on a traditional system? You have to make sure the timer in on, and you have to turn the thermostat up.



    I don't want him to do anything. You do. I just tried to provide...
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    The problem with this approach is it will only...

    The problem with this approach is it will only turn the boiler on for a short while until the controller turns it off again.



    So... you have 12 thermostats then! You know, the HR92s? Turn one...
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    Turn the thermostat up

    Turn the thermostat up
  13. I'm no expert on pumps, but it looks like you...

    I'm no expert on pumps, but it looks like you have two pumps in series there (the main circulator and the UFH), and that's going to give you problems.

    Also, you don't appear to have any bypass in...
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    I don't see why not. If you drop me a DM with...

    I don't see why not. If you drop me a DM with your email address, I'll add you to a Slack group where a bunch of us who know about these things hang out.
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    The point is, as long as the pump is on and...

    The point is, as long as the pump is on and cycling the water, and the water is warmer than the room temperature (when it reaches the rad), then it will be heating the room. It will just be a low,...
  16. Thread: Haunted EvoHome

    by dty
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    LOLz! :D Given there are a bunch of us who...

    LOLz! :D

    Given there are a bunch of us who understand the radio protocol at the physical level - i.e. the actual radio setup, the encoding of the digital signal onto the radio signal, the syntax...
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    For example, here's some data from my...

    For example, here's some data from my (OT-controller) boiler the other morning.

    1412

    I'm colour blind, so I don't have names for all the colours, sorry! If you look at the period between 07:25...
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    You are correct that the cycle rate (and minimum...

    You are correct that the cycle rate (and minimum on time, etc.) are for controlling the boiler via a BDR.

    With OpenTherm and a low demand situation like you've described, I would expect Evohome to...
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    Yes. Honeywell make a thing in their literature...

    Yes. Honeywell make a thing in their literature about a robust communication protocol, when the reality is that it's anything but. The protocol is completely proprietary, but the UDP analogy is...
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    There is no positive acknowledgement in the...

    There is no positive acknowledgement in the protocol. Some messages are requests which receive an immediate reply, but most are just sent with the assumption that they've arrived or that the periodic...
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    Evohome does NOT solve this problem. It closes...

    Evohome does NOT solve this problem. It closes the valves before it switches the boiler off - so the boiler can be running for a short while with the valves closed. Furthermore, the boiler will...
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    I don't know much about oil-fired boilers, but I...

    I don't know much about oil-fired boilers, but I do know you're not meant to turn them on and off rapidly. Could it be that you need to play with the cycle time and minimum on time in Evohome? Is it...
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    2.4Ghz 868MHz.

    2.4Ghz <> 868MHz.
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    Perhaps, but then neither of the proposed...

    Perhaps, but then neither of the proposed solutions would work. If a zone valve would work, the rad and UFH pipework must be separate. And if they are separate but the rad pipes are still getting...
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    If the radiators are all shut down, water can't...

    If the radiators are all shut down, water can't flow in the pipes unless there's a bypass somewhere.
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