[OpenTRV-dev] Paul's case

Tue Apr 2 14:51:48 BST 2013

Hi There,

Ok my set-up is already somewhat hacked.

I have a newish (2 years old) boiler. which now directly controls the pump.

The system use to have 2 circuits, one for DHW and one for central heating.
There is a stat on the tank that controls a divert valve and this then
calls for heat from the boiler. The second divert valve is operated from a
room stat which then calls for heat.

I have since split the central heating in to two zones. A second wall stat
operates this third valve.

I have a relay that is software controlled to apply power to the DHW stat.
This allows me from a webpage to turn on the hotwater. Or from a script
turn it on. It used to be in the summer that we would heat the water with
E7 electric.

As a feedback loop i also power a relay from the tank stat and a second
relay from the pump. This allows me from the webpage to see that DHW is
requested and that the Tank is also not up to temp and that the pump is
running.

I have several DS1820's on the tank so i know how much hot water there is.
We heat a small amount each day for washing, and then a larger amount for
baths.

The central heating is similar in that I have a time clock powering the two
room stats. and again these each also power a relay so i can see which stat
is active. I can also bypass one room stat to force more heat into one
circuit.

This is where we are now. Going forward I would like to be able to control
each room individually. What i'm looking for a simple electric TRV which i
can override from software, I use XAP messages in the network to control
the relays. So if i build a central hub I will be using XAP on the network
side of things.

So as i see it a RPi plus radio to control each room TRV.

Hope this helps.

Regards

Paul

Paul Smith

Your Local Computer Specialist, Supporting Your Business When You Need It
Most

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On 2 April 2013 14:26, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:

> Hi,
>
> The existing OpenTRV V0.09 may do what you want, depending on the details
> of your boiler control.
>
> It simply has a toggle between frost/warm/bake modes, a small setback when
> the room is dark, and the ability to control the local rad with an FHT8V
> wireless value and optionally a local boiler.  The two rads in one room can
>
> (I'm currently managing 3 rads in 3 rooms.)
>
> Tell me please:
>
>  * What your boiler is and
>  * What thermostat you currently have (is it 2-wire, 240V, which we can
> control?) and
>  * Are any of the rads you want to control in the same room as the
> thermostat (and with existing TRVs or not)...
>
> (Feel free to mail me privately if you wish.)
>
> Rgds
>
> Damon
>
>
>
> On 2 Apr 2013, at 14:18, Paul Smith wrote:
>
> > Hi Guys,
> >
> > So based on the discussion so far what should be my starting point to
> get basic control over 3 rads in two rooms.
> >
> > Regards
> >
> > Paul
> >
> >
> > Paul Smith
> >
> > Your Local Computer Specialist, Supporting Your Business When You Need
> It Most
> >
> > We also now do Portable Appliance Testing, if you would like to know
> more please drop us a line.
> >
> > Tel:-  0845 009 6226
> >
> > This email and any attachments may be confidential and/or privileged.
>  Everything is intended for use of the addressee only. If you receive this
> message in error then you must not print it or pass it on to anyone else or
> use the information it contains.  Please inform Phoenix Technology UK  of
> the error by email or by telephoning (+44)(0)845 009 6226.  Please then
> delete all copies from your system.
> > If you are not the intended recipient then you must not use the
> information in the message or attachments or allow anyone else to do so.
> >
> >
> > On 2 April 2013 14:16, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> > Hi,
> >
> > OpenTRV might never had happened if the FS20 system had incorporated
> occupancy-based setbacks and the system had had some way to switch to an
> English localisation.  (I didn't really want to make the rest of my family
> learn German to operate the controls!)
> >
> > Rgds
> >
> > Damon
> >
> >
> > On 2 Apr 2013, at 14:01, Thomas Hood wrote:
> >
> > > On Tue, Apr 2, 2013 at 1:05 PM, I wrote:
> > >> Among the commercial systems that I have looked into only Honeywell
> > >> Evohome and Danfoss Living Connect dare to control the boiler and only
> > >> Honeywell can control a modulating OpenTherm boiler. Reading forums
> > >> related to these systems I didn't get the impression that the software
> > >> in those systems has been well tuned yet.
> > >
> > > And just after sending that I found out from the site to which Damon
> linked
> > >
> > >
> http://www.webinos.org/blog/2013/02/23/home-heating-automation-using-webinos/
> > >
> > > that the Conrad FS20 system also has a boiler controller component.  :)
> > > --
> > > Thomas
> > > _______________________________________________
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> > >
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