TRV Controller Discussion Thread

Posted on
Mon Nov 05, 2018 1:57 pm
IndigoSam offline
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Joined: Apr 14, 2013

Re: TRV Controller Discussion Thread

siclark wrote:
Ha. I thought the same, seems excessively deep, but if it means a decent readable screen rather than the danfoss/Popp ones I'm all for it.


Yep, totally agree. The size, of course, diminishes somewhat when it is actually on a radiator. All looking good so far.

Sam.

Posted on
Mon Nov 05, 2018 2:02 pm
siclark offline
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Location: UK

Re: TRV Controller Discussion Thread

Oh wow. These are awesome!! Included and installed in 3 mins, even across different floor from Mac. Instant response. Wish I had bought these sooner!



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Posted on
Mon Nov 05, 2018 2:59 pm
autolog offline
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Location: West Sussex

Re: TRV Controller Discussion Thread

autolog wrote:
... The plugin went into a Z-Wave loop and locked out Indigo which I eventually managed to get into to be able to stop and restart the Indigo server. :shock: ....
Sorted that problem 8) - still some tidying up to do but good progress is being made. :)

siclark wrote:
Oh wow. These are awesome!! Included and installed in 3 mins, even across different floor from Mac. Instant response. Wish I had bought these sooner!

Sounds like you are as impressed as I was when comparing them to previous TRVs. :D

Posted on
Thu Nov 08, 2018 4:28 am
siclark offline
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Joined: Jun 13, 2017
Location: UK

Re: TRV Controller Discussion Thread

On a more general Spirit TRV note. How do you have them setup? I got confused with the valve device until I've realised it wasn't being reported. I have it set to 10, thinking that would limit updates and save battery but not sure. Also should I untick all the exclude boxes to get all days sent on polling or is that not needed?

I had an issue last night when the radiators kept heating to 25c despite being set to 21. Not sure if that was just residual heat or the valve was still open?

Posted on
Thu Nov 08, 2018 12:59 pm
autolog offline
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Location: West Sussex

Re: TRV Controller Discussion Thread

The valve control doesn't work (is ignored) if you haven't switched the Spirit into Valve Control Mode. At the moment, the Indigo UI doesn't enable you to do this. You would have to use a Z-Wave raw command. Once this is done, then the valve slider will work, that is until the TRV is put back into normal mode which will happen if you press any of the TRV buttons or select a Mode in the UI .

The Z-wave raw command is:
Code: Select all
0x40, 0x01, 0x1F
As regards the temperature, I am not convinced that it is reporting on temperature change (I have it set to 0.5C). I think that the thermostat might have to be polled to provide a timely update. I wasn't actually expecting this as I thought it would update when it changed. However, I suppose it could make sense as most of the time it is sleeping just waiting for a command.

I think that my plugin could poll the Spirit, say every 5 minutes (but user definable) , whilst the Spirit is in an active heating schedule, otherwise it won't.

Posted on
Sat Nov 10, 2018 5:00 am
siclark offline
Posts: 536
Joined: Jun 13, 2017
Location: UK

Re: TRV Controller Discussion Thread

Having used these for a while, I'm confused at to how the plugin works with the remote temperature sensor?
If the set point is 20, the spirit is measuring 21 but the remote sensor says 18, how does it tell the spirit to come on? Does it force it into boost, therefore 100% open, or adjust the set point on the spirit?
Watching the way the spirit controls the valve, as the temp approaches the set point the valve slowly closes, reducing the hot water so slowing the temp increase so it doesn't over shoot. (in theory)
Also it keeps it slightly open whilst temp is above set point to ensure the room temp doesn't drop quickly. Not sure if the Stella was same or just on or off only?

Posted on
Sat Nov 10, 2018 6:56 am
autolog offline
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Location: West Sussex

Re: TRV Controller Discussion Thread

It adjusts the set point on the Spirit by a user defined amount (TRV Delta Max) - as in configuration shown below:
configure_trv_controller.png
configure_trv_controller.png (184.4 KiB) Viewed 165 times
I may refine this approach once I have got everything working: with the Spirits it would be possible, for example, for the plugin to fully control them using the valve controls. I could enable the configuration to be set up to be able to specify the valve opening depending on degrees difference. :)

A number of things have conspired against me this week which have resulted in slower progress than I would have liked: extra unplanned grandson minding; having to climb up on the roof to clear a gulley which had filled with moss and was causing a leak in the garage etc etc! :)

Posted on
Sat Nov 10, 2018 9:57 pm
siclark offline
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Location: UK

Re: TRV Controller Discussion Thread

autolog wrote:
I may refine this approach once I have got everything working: with the Spirits it would be possible, for example, for the plugin to fully control them using the valve controls. I could enable the configuration to be set up to be able to specify the valve opening depending on degrees difference. :)

It sounds pretty clever anyway but this would be awesome.

Posted on
Sun Nov 11, 2018 4:21 pm
siclark offline
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Joined: Jun 13, 2017
Location: UK

Re: TRV Controller Discussion Thread

You said you have one on your desk testing, but have you got one on a radiator?

It would be cool if you could get to the point of controlling the valve directly and stop the m temperature shooting they the set point. I think the valve should start closing before the set point is reached.
IMG_1138.jpg
IMG_1138.jpg (65.06 KiB) Viewed 114 times


Ignore the axis titles. This is temp and set point on top, and valve % open below. It seems to nicely ramp the valve when increasing openness. However as temp increases it is full open until temp shoots through the set point. It doesn't lead to a smooth temperature profile!

Posted on
Sun Nov 11, 2018 8:09 pm
kw123 offline
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Re: TRV Controller Discussion Thread

If the thermometer is away from the heater you will always have a delay in temp measurement. And the heater also has some capacity it will continue to heat even when it is off.


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Posted on
Mon Nov 12, 2018 2:13 am
autolog offline
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Re: TRV Controller Discussion Thread

siclark wrote:
You said you have one on your desk testing, but have you got one on a radiator?
I have another ten Spirits already attached to radiators. 8)

siclark wrote:
It would be cool if you could get to the point of controlling the valve directly and stop the m temperature shooting they the set point. I think the valve should start closing before the set point is reached.. ...
I think this idea is worth pursuing because I have noticed the same thing. I will add it to the list of things to do once I have got the beta out the door. :)

Posted on
Mon Nov 12, 2018 2:36 am
siclark offline
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Location: UK

TRV Controller Discussion Thread

kw123 wrote:
If the thermometer is away from the heater you will always have a delay in temp measurement. And the heater also has some capacity it will continue to heat even when it is off.


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This thermometer is on the radiator as part of the trv. Agree the over heat can occur as the radiator still has hot water in it once the valve is turned off, which is why on what is already a smart trv, it doesn't take that into account. It clearly has the ability to part close the valve so could do to try and reduce this effect.

Although once I can learn how to solder I'm going to use pibeacon to get the temperature from better positioned temp sensors.

Posted on
Mon Nov 12, 2018 3:48 am
siclark offline
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Joined: Jun 13, 2017
Location: UK

Re: TRV Controller Discussion Thread

Image

This is perfect example. It slowly reopens the valve to start heating (although doesn't do much good as boiler is off) but doesn't slowly close the valve.

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