[OpenTRV-dev] Paul's case

[Paul Smith]

Hi,

I'm thinking occupancy detection is one step to far. A basic schedule would
do. such that a room is active during certain times of the day. I think a
stat in each room makes sense. I can put ds1820s in just need a nice
looking box for SWBO approval. I already have some in the airing cupboard.

If the TRV contained a stat and had a way of reporting back its target and
current state that would be useful. For me i dont see a need for local
control, i'm happy to do that from a webpage or app.

I do like the idea mentioned earlier about diverting boiler heat into DHW
when the cycle is finished. I can see how i would do that just means a bit
of rewiring.

DHW is sorted for me.

Regards

Paul




Paul Smith

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On 2 April 2013 15:00, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:

> Hi,
>
> Would you by preference:
>
> a) replace those existing room stats with (sat) DS18B20s (and maybe
> occupancy sensors) talking via radio to the RPi, and have the RPi control
> the wireless valves directly, or
>
> b) opt for more autonomy in the valves, eg sending them a new set-point
> and have them call back for heat if not meeting that set-point which may be
> adjusted by occopancy, or
>
> c) something else?
>
> Note that I'm ignoring DHW for now.
>
> Rgds
>
> Damon
>
>
> On 2 Apr 2013, at 14:51, Paul Smith wrote:
>
> > 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
> >
> > 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 14:26, 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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