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  1. Replies
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    Ok, I'm not sure I have this plastic cover. If I...

    Ok, I'm not sure I have this plastic cover. If I remove the lower grey cover on the cylinder, this is what I see - you can see the 2 dry pockets and the wires leading into them with the stats.

    1364
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    That's it - "North" and "South", as per your...

    That's it - "North" and "South", as per your description, contain the stats. The 2 wires in each correspond to the overheat stat (which will be spring like and inserted furthest into the pocket) and...
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    That's incorrect. There are 2 dry pockets above...

    That's incorrect. There are 2 dry pockets above and below the connections for the immersion heater.

    I'm basing this on my own cylinder, but this looks identical. A close up picture would help...
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    I can't quite make out your picture, but it looks...

    I can't quite make out your picture, but it looks very similar to mine (Megaflo Eco Indirect 250L). There are 2 dry pockets - one above the immersion heater connections and one below.

    The top one...
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    So your problem is solved? If not, then...

    So your problem is solved?

    If not, then balancing should help in getting a 20 degree delta consistently, regardless of which radiator is on or not. As I said in my first post, though, there's...
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    Start with all closed and open one at a time,...

    Start with all closed and open one at a time, starting with the closest (this will require a quarter turn or even less) and finishing with the furthest (which will probably be fully open - about 8 to...
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    I wrote a reply but not sure where it went. ...

    I wrote a reply but not sure where it went.

    Take TRVs off.
    Use contact probes (rather than IR) at each rad to get delta t of 20 by adjusting lockshield.
    Start with closest rad to boiler first.
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    Over sizing rads is generally good, as at the...

    Over sizing rads is generally good, as at the same delta T you'll get more heat output from them. I've done the same.

    However, your system needs to run at the delta T it was designed for. This...
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    Without balancing, you can't ensure your delta T...

    Without balancing, you can't ensure your delta T at the boiler will be 20 degrees.
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    Just to add, I wonder if the lack of balancing is...

    Just to add, I wonder if the lack of balancing is contributing towards your flow/return problem.

    If your boiler is condensing, it'll have an optimal delta of 20 degrees. This means each radiator...
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    You should balance the system, rather than having...

    You should balance the system, rather than having all lockshields open. Evohome opens TRVs fully if the temp differential is more than a few degrees. As it stands, your rads will be heating up...
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    The radiator may or may not help you as a bypass....

    The radiator may or may not help you as a bypass. It depends on your pump and the minimum flow rate required. The ABV is usually situated close to the boiler and so supplements the flow rate in your...
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    The auto-bypass may need adjusting. Remember,...

    The auto-bypass may need adjusting. Remember, though, that it maintains the minimum flow required by the boiler, so it can't just be set higher, otherwise you may end up with too much differential...
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    Someone more experienced than me will be able to...

    Someone more experienced than me will be able to tell you for sure, but my understanding is the Megaflo temp stat has an overheat stat built into it (effectively wired in series). It has a reset...
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    I find my bubble needs recharging every 6m or so....

    I find my bubble needs recharging every 6m or so. I have a potable expansion vessel which I'll have installed at some point so I can do away with the megaflo's poor solution.
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    Make sure the overheat stat on the megaflo still...

    Make sure the overheat stat on the megaflo still closes the Zone Valve when activated. This is a very important safety feature.
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    The Wiser manual is sparse on info, but it does...

    The Wiser manual is sparse on info, but it does say this:

    The Wiser Heat HubR is an OpenTherm certified product and will therefore operate with OpenTherm certified boilers. Currently The Heat HubR...
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    Drayton wiser opentherm and hot water

    Searched for an answer to this but couldn't find anything relevant.

    How does the drayton wiser system manage hot water when using opentherm? Evohome has a cylinder kit which monitors the tank...
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    Drayton wiser opentherm and hot water

    Sorry. Now posted in heating section.
  20. Jackthom, what interface are you using from the...

    Jackthom, what interface are you using from the Raspberry PI to the boiler?

    I've been looking at building a relay using an arduino to monitor my DHW motorised valve, using an opto-isolator to...
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    Ah - actually good to hear I'm not the only one...

    Ah - actually good to hear I'm not the only one experiencing that issue.

    Though slightly concerned that the mix of cold water with the hot in the pipework isn't sufficient for the boiler to sense...
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    That's where the ABV should kick in to maintain...

    That's where the ABV should kick in to maintain the minimum flow rate. Slightly different problem to the one I described, which is inherent in any cold zone flushing water to the boiler return (this...
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    True - if your flow temps are low, then you'll...

    True - if your flow temps are low, then you'll get condensing. I guess it's only an issue once your flow temps are over 65. I, too, have the issue that the combined head loss of both the boiler and...
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    So as power goes down, so does dT? Flow...

    So as power goes down, so does dT?

    Flow rate=KW/(4185 * dT)

    Which is precisely my concern because it means when the boiler is modulating (most of its life), it is not running at the design 20...
  25. I'll be very interested in the result of this.

    I'll be very interested in the result of this.
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