Minimum valve opening value for individual TRV

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wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 03.10.2020, 21:02

tomi_cc16 hat geschrieben:
03.10.2020, 11:24
Hi,

yeah there was/is a mini mistake in the Defice Definitions but already corrected.

If you want to test the corrected version and you have Android- just go to the Play Store - Smartha App - scroll down and choose “want to take part at BETA”.
Install BETA

Go to “Device Definitions” and active this:
79D358BC-CAF1-4463-9648-9BFCF7E5131E.jpeg


Or wait 1-2 weeks until the update is officially released
Got it! A valve that showed 0.3% changed to 15% when I reset it's layout (I edited it to show the decimals).

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 04.10.2020, 12:23

I'd like to add another problem here. Today I discovered one of the radiators in a room that was requesting heat (setpoint 19, actual 18.8 and WHS2 channel 1 was ON) was cold. Smartha said the valve was set to 24%, but the pipes were cold. So I unscrewed the HmIP-eTRV-B and voila, I could hear the water starting to flow and the pipes and radiator heated up straight away.

What is going on!!!??

Edit: It could be that the valve was stuck, but it's only 6 months old. Maybe these valves don't like the way the Homematic TRVs open and close, in which case I need to replace quite a few :/ Not a prospect I look forward to.

tomi_cc16
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Re: Minimum valve opening value for individual TRV

Beitrag von tomi_cc16 » 04.10.2020, 17:31

You could take the battery out - wait until ADA (Adjusting) appears at the Display and press the Boost button to adjust the valve.

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 05.10.2020, 13:47

tomi_cc16 hat geschrieben:
04.10.2020, 17:31
You could take the battery out - wait until ADA (Adjusting) appears at the Display and press the Boost button to adjust the valve.
Worth a try. In the meantime I've ordered a CCU3.

What I have noticed by monitoring Smartha is that the valves tend to mimic "traditional" TRVs. When the difference between setpoint and actual temperature is small, the valve will only open a little bit. Increase this difference and the valve opens further. Unfortunately this sometimes keeps the actual temperature just below the point where HomeMatic is happy enough to turn off the boiler, leading to the boiler being on for hours without actually increasing the temperature enough to fully close the valve.

The documentation is vague about this, but the "Minimum valve opening for heat demand" setting of the WHS2 should be able to mitigate this, however the default is 1% and the maximum 10%, which I think is not enough for the radiators located the furthest away from the boiler.

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 14.10.2020, 16:29

tomi_cc16 hat geschrieben:
28.09.2020, 18:33
In the CCU you have this options:

Valve.JPG
The CCU3 has arrived and I have been testing it with an HmIP-eTRV-B. I'm starting to feel stupid now, because I can't find the screen you show at all! Could you point me in the right direction please?

EDIT: disregard, apparently uBlock origin in Firefox blocks part of the CCU WebUI.

I still can't find the valve offset setting for the eTRV-B, even though it is listed as a parameter in the HmIP Device Documentation (137.3.2.2.569. Parameter VALVE_OFFSET).

tomi_cc16
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Re: Minimum valve opening value for individual TRV

Beitrag von tomi_cc16 » 14.10.2020, 21:05

I guess you need to activate expert mode first under user management
819BDD36-1C2F-44BF-B24B-E54F2234D501.jpeg

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 15.10.2020, 20:19

tomi_cc16 hat geschrieben:
14.10.2020, 21:05
I guess you need to activate expert mode first under user management
819BDD36-1C2F-44BF-B24B-E54F2234D501.jpeg
OMG you are a star! I trawled through all the manuals but never thought it was something as trivial as a single tick box! :mrgreen: :mrgreen: :mrgreen:

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 23.10.2020, 16:23

It doesn't look like I can use valve offset to set the minimum opening. The documentation within the CCU WebUI states this setting is for use with multiple radiator valves in one room.

After setting a value (I've tried 20 and 50%), Smartha shows no change to valve opening percentage and I can't hear the valve opening any further than it's current setting. I've waited about an hour and then increased the setpoint to above the current temperature, but the valve still does it's own thing and is currently showing 9% open. :(

Any ideas?

tomi_cc16
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Re: Minimum valve opening value for individual TRV

Beitrag von tomi_cc16 » 23.10.2020, 23:53

As I understand your valve normally has a range from 0 - 100%.

When you set the offset to e.g. 20 - the new "0" will be open with "20". So next time the valve will heat up and than after a while stop heating it will return to "0"what will be in reality the offset "20".
The App of course will show you still "0".
If it should heat up with e.g. valve 40, in reality it will be +20 = 60 - in the App you still only see 40.

After I tested and it worked, this is my understanding of this function.

wutr
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Re: Minimum valve opening value for individual TRV

Beitrag von wutr » 24.10.2020, 13:22

tomi_cc16 hat geschrieben:
23.10.2020, 23:53
As I understand your valve normally has a range from 0 - 100%.

When you set the offset to e.g. 20 - the new "0" will be open with "20". So next time the valve will heat up and than after a while stop heating it will return to "0"what will be in reality the offset "20".
The App of course will show you still "0".
If it should heat up with e.g. valve 40, in reality it will be +20 = 60 - in the App you still only see 40.

After I tested and it worked, this is my understanding of this function.
That's interesting and it makes sense, although then it would never close fully. That is OK if I can find the exact percentage where it starts to allow water through.

However I still have the valve offset set to 50% (there is only one valve in this room) and I haven't heard it operate in such a way that indicates it opened to 50 + whatever-it-was-before. I'll test it a bit more...

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