[OpenTRV-interest] Programmable TRV performance

[Damon Hart-Davis]

Hi,

You can buy the complete ‘REV2’ split units (£55+VAT in 3D printed box) + the third party (Conrad) valve (~£40 incl VAT and P&P) , though be aware that they are engineering samples and not, for example, formally CE stamped or safety tested.  (We believe that such tests would probably be passed, but that’s not the same thing of course.)

These units are also capable of driving a boiler interlock in parallel with or instead of your main (2-wire) thermostat.

Rgds

Damon


> On 16 Feb 2015, at 17:16, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> 
> Is the split configuration available as a kit or even assembled?
> 
> Mark
> 
> On 16 February 2015 at 16:17, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> Hi,
> 
> The split configuration does this already.
> 
> The all-in-one unit probably requires some TLC to help work round the issue that you observe: I’m still working on fixing the closest analogue that I have at the moment.
> 
> Rgds
> 
> Damon
> 
> > On 16 Feb 2015, at 16:12, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> >
> > Is OpenTRV sufficiently advanced to do this yet?
> >
> > Mark
> >
> > On 16 February 2015 at 16:10, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> > Hi,
> >
> > Note of course that you may have temperature gradients across the room: in one of mine I observe ~2C for example.
> >
> > So have the sensor near you if possible if this is an issue for you!
> >
> > Rgds
> >
> > Damon
> >
> >
> > > On 16 Feb 2015, at 16:06, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> > >
> > > Thanks Damon, I was thinking it might be a combination of factors as you suggest.
> > >
> > > Looks like the best thing would be to have a TRV controlled by a wireless sensor in another part of the room.
> > >
> > > Cheers,
> > >
> > > Mark
> > >
> > > On 16 February 2015 at 15:49, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> > > Hi,
> > >
> > > It may start closing well before the target temperature to try to minimise fluctuations; I start closing about 1C below the target I have in the OpenTRV control loop.
> > >
> > > Also it may see some direct radiative heating as I sometimes do on OpenTRV units, and be reacting to that.  It’s still something I’m working on handling fully elegantly.
> > >
> > > There may also be a calibration error of +/- 1C on the temeprature sensor (the one we use are closer than that).
> > >
> > > In other words, that place may be approaching 20C including direct radiative heat and air rising from the flow/return pipe when the valve closes thinking that it’s hit 21C.
> > >
> > > Rgds
> > >
> > > Damon
> > >
> > > > On 16 Feb 2015, at 14:52, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:
> > > >
> > > > Hi,
> > > >
> > > > Sorry if this is a bit OT, but I thought people in this forum might be the most likely to know the answer.
> > > >
> > > > I have a Honeywell HR25 programmable thermostat on my bedroom radiator. It is programmed for 21degC in the mornings, but I can hear the valve start closing from about 17.5deg as the room warms up and completely closed by 19deg room temperature. There's a good airgap all round the TRV; 500mm to the bed, 300mm gap under the bed, and 600mm at the end of the bed nearest the TRV. There is a window 240mm above the rad and the curtain stops 170 above.
> > > >
> > > > Any idea what's going on?
> > > >
> > > > Regards,
> > > >
> > > > Mark
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