Vaillant VR71, SensoComfort and NetSensor Gateway initial set up

[Deleted member 281264]

Makes sense, I just keep it on 45c and then run a legionella cycle up to 60 every so often

Wish I got a smaller cylinder, 300 seems uneccesary with PDHW

 

[thebaldfox]

Ok, it's now been just over a week since we've had it all installed. The weather compensation curve has now automatically dropped down to 2.1. Really happy with the upgrade. Boiler flow temps are regularly under 40-50 degrees, and if we do require a boost, the system is much more responsive. The app isn't the best, so not sure I can recommend the additional expense of the SensoNet gateway, but it'll be handy in the future.
We reduced the HW heating to 90 mins in the morning, and asn hour in the evening. Not noticed any loss of HW yet (although just two of us here).

At some point, would like to introduce TRVs into the mix to try and increase the efficiency further, but that's another can of worms!

 

[Deleted member 281264]

2.1 is quite a high curve, i'm running my radiators at 0.7 and ufh at 0.55

 

[thebaldfox]

2.1 is quite a high curve, i'm running my radiators at 0.7 and ufh at 0.55

Is your house a new build/really good insulation?
I'm assuming that if the system can move lower it will with time. When the weather warms up I'll be more inclined to be more aggressive with it.

 

[ScottishGasMan]

2.1 is fine for regular higher temp heating system. ie designed for around 75 degrees when its -2 ish outside. I'm on 0.75 but my rads are much bigger than needed for when heat pump is installed.

What app are you currently on? is it the "sensoAPP" or "MyVaillant" app?

If its the senso app then yes, it can be quite slow, but you will get migrated over to the MyVaillant app and servers this year all going well. its much faster and very responsive.

 

[dilalio]

2.1 is fine for regular higher temp heating system. ie designed for around 75 degrees when its -2 ish outside. I'm on 0.75 but my rads are much bigger than needed for when heat pump is installed.

What app are you currently on? is it the "sensoAPP" or "MyVaillant" app?

If its the senso app then yes, it can be quite slow, but you will get migrated over to the MyVaillant app and servers this year all going well. its much faster and very responsive.

@ScottishGasMan really informative posts there, from the forum's Vaillant controls expert... Thank you.

That's useful knowledge about vaillant parameters and well translated.

Wish you could do same with Viessmann jargon

 

[Deleted member 281264]

Is your house a new build/really good insulation?
I'm assuming that if the system can move lower it will with time. When the weather warms up I'll be more inclined to be more aggressive with it.

Yes pretty well insulated and oversized rads

You must be using adaptive heat curve, which I don't like. I prefer full weather compensation or 'active' as a compromise, which uses room temp + a set wearther curve at the same time

Imo you are better of trying to tweak it yourself and try and get it to run on full weather compensation, eventually getting to a point where the heat from your rads if matching the heat lost from the building and keeping your house at a nice stable temperature

 

[thebaldfox]

Yeah am using adaptive. We only have the main sensocomfort controller acting as a thermostat so it's not ideal. Will see how it goes for now and will look to reduce the curve manually as time goes on. I'm updating the thread as a guide for others too. The literature out there isn't great on how to set this stuff up.

@ScottishGasMan yeah senso app. Looking forward to the new one !

 

[thebaldfox]

So the curve has dropped further still and is at 1.68. Can someone tell me, is this the system refining it's assumptions about how long/how much energy it takes to heat the house or is this because the outside temperature is getting warmer it's decreasing the curve automatically? I.e. By October/November I should expect the curve to revert back to higher values?

 

[ScottishGasMan]

Could be either or.
Technically a curve should be good for the full year, but every house is different, solar gains affect some houses much more than others so you may find it increases a little again when the weather gets colder.

It works off of how long it takes to heat the house, so if your heating from cold it will increse curve as it will usually take to long other wise, if your heating from a setback of like 17 or 18 degrees then it may reach tempearure quick enough and stay lower.

 

[thewickedpickett]

Just found this thread as I’ve paired a VR20 sensor with the sensohome controls and internet gateway. I have a 836 eco tec combi.

Some great info here. Can I just check when Room Temp mod on the sensohome is on inactive what temperature is it working to?

Similarly if I have room temp mod expanded on does that mean it measures room temp and uses the weather comp heat curve only when I have timings set? Outside of this it defaults to set back?

 

[ScottishGasMan]

Inactive: flow temperature is based on desired room temperature and outdoor temperature. The actual room temperature is ignored, so heat curve needs to be spot on.

Active: flow temperature is based on desired room temp, actual room temp, and outdoor temp. So if room is colder than desired the flow temp will boost a little bit, if room over heats then flow temp will decrease a little bit.

Expanded: same as active, except the room controller also acts as a room stat, if the temperature goes over desired room temp the heating will be shut down until the room cools a bit.

Easy way to do it for boilers is turn on adaptive heat curve & set to expanded, let the control adjust itself through the winter, you just tell it what temp you want room to be. Have a reasonable setback, ie 16-17 overnight so it's not working too hard bringing house back up to temperature.

I have 20 when it's on 18.5 when off. Sometimes I just leave it at 19.5 24/7.

 

[thewickedpickett]

Thanks for this. I’ve got it set to expanded and adapted activated too.

One thing I noticed was on those settings it lets the set back temp go slightly below before the heat comes in. ie I had set back at 18.5 and it didn’t come on when it was 18.4 on the app. It did come on at 18.3. Is this just the in built hysteresis?

I had it on active the night before and as you’ve said it’s basically always on when using this. I can see the merit to this but it is a little noisy at night.

 

[ScottishGasMan]

Yea, the apps and control facia just rounds things off. It's watching the room temp to 2 or 3 decimal places and there are built in hysteresis to this on top.

In the winter its very nice. Wake up in the morning and you have no concept of the weather outside as the house is sitting at a comfortable even temepreature.

 

[thewickedpickett]

Really appreciate your help. Over here in Belfast installers really know very little about the controls. Vaillant have been reasonably helpful but it takes time to get a response.

Does the adaptive curve also adapt up so to speak? Ie if the curve is too low it turns it up.

Do you know what the minimum outdoor sensor radio link is? Even though mine is pretty close to the sensohome it is at 2.