[OpenTRV-interest] Programmable TRV performance

Thu Feb 19 16:20:30 GMT 2015

Sure, thanks for the answers, I have some more questions though :) As
expected ...

...for the plastics, will there be a downloadble version we can print/have
printed ourself in a fablab or at friends place, for the less 'visually'
interested people?

... When reading boiler manuals and seeing manufacturer (Junkers in my
case) boiler options, there is always a 'special' thermostat for modulating
boilers, 'different' from the ones for older standard pump/boiler on/off
switch. How does that work then? More on this, I have read this on a Nest
forum: "All a thermostat like the Nest can do is send an on/off signal, or
if you're lucky, a stage 1 or stage 2 signal. Modulating furnaces vary in
how they respond to this signal, and I forget what Goodman does. Some will
not modulate at all without the matching thermostat, becoming a single or
multistage furnace. Others will modulate, but based on an internal
algorithm that guesses how the modulation should go based on the length of
heat calls. In other words, it doesn't actually know the room temperature
like the thermostat would. The latter is better than the former, but using
the [boiler matching] matching thermostat beats both."

Another comment (on the Junkers boiler, the one I intend to use) and the
modulating process I found here:
http://forum.loxone.com/enen/software/5664-question-intelligent-room-controller-2.html
So I'm not sure how much actual use of the modulation there will be in this
only on/off situation.
Something interesting I also found, on the same link as the 1st quote: "Most
of the new "modulating" variable-speed systems are using a ClimateTalk
<http://www.climatetalk.com/>compatible protocol.".
https://community.nest.com/message/42434

So is there any plan to support that in the future, in that case then I
need to figure out if my new boiler also supports that 'standardized'
protocol.?

Thanks again,
Geert

Kind regards,

Geert Steyaert (Tel. : +32 475 535620 & +31 6 34916723 )
SAP Netweaver Technology Consultant
IBM GBS Belgium

EMAIL ADDRESS HIDDEN & EMAIL ADDRESS HIDDEN

On Thu, Feb 19, 2015 at 4:06 PM, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:

> REV7 is the rad valve and REV8 is the boiler end.
>
> The tech should be mature enough (and you will be able to upgrade the
> software if you want to), but we may not have committed to a substantial
> production run by July; the plastics process is complicated and expensive
> (>£50k for full production moulds, etc).
>
> Boiler control will still be on-off by default.  Most boilers should be
> clever enough to modulate themselves by observing return/flow times.
>
> I do not expect to have better than alpha-standard Internet access this
> year since there is a fair chunk of important security stuff to get right
> first and that takes time.  Yes, RPi is very likely part of the story in
> one form or another.
>
> Does that help
>
> Rgds
>
> Damon
>
>
> > On 19 Feb 2015, at 14:34, Geert Steyaert <EMAIL ADDRESS HIDDEN>
> wrote:
> >
> > Is that the Rev7 board work which is in progress now? What's the status
> on the adaptations of the Conrad valves towards the new radios?
> >
> > I'll be installing a brand new modulating & condensing gasboiler, with
> thermostatic valves in my new house, once I have the keys, being earliest
> July.
> >
> > Will the Rev7 (or higher at that time) system be mature enough at that
> time, say July/August timeframe, to properly support the complete install?
> Taking into account the new radios, HW adaptations at the valves, efficient
> modulating control of the boiler?
> > Is some kind of internet control in the plan for this year? I don't mind
> having a RPi (or similar) partly dedicated for this if need be.
> >
> > Or, should I better wait till somewhere Oct/Nov to look again at
> progress/status of this project to buy the kits? Since in the summer is not
> that urgent to install a very efficient heating system anyway ...
> >
> > Thanks,
> > Geert
> >
> > On Mon, Feb 16, 2015 at 6:32 PM, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> > Note that, FWIW, an RFM12B is not capable of the OOK (On-Off Keying)
> that we happen to currently use, ie to talk to the Conrad valve.
> >
> > We are using the RFM23B, and sometime real soon now will move to the
> RFM69CW, though put that off a bit by buy nearly 400 of the 23Bs!
> >
> > Rgds
> >
> > Damon
> >
> >
> > > On 16 Feb 2015, at 17:27, Tim Small <EMAIL ADDRESS HIDDEN> wrote:
> > >
> > > On 16/02/15 17:16, Mark Wigmore wrote:
> > >> Is the split configuration available as a kit or even assembled?
> > >
> > > FWIW, others have retrofitted a RFM12b radio to the HR-20, and also
> > > re-written to the firmware from scratch, this suggests it also works
> > > with the HR-25 hardware:
> > >
> > >
> https://piontecsmumble.wordpress.com/2013/02/25/openhr-20-tutorial-part-0-introduction/
> > >
> > > No one has got this working with OpenTRV yet, but it sounds feasible I
> > > think.
> > >
> > > Tim.
> > > _______________________________________________
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> >
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