Posted by: @jeegnesh

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Should I set the timer window to reflect my hot water timing or should I just turn noise reduction off

I would leave for now, make only one change at a time!  NR mode will likely improve efficiency but no idea if it's significantly.  Of course it also clamps output!

Can you clarify why the heat pump seems to go off altogether for several hours each day.

Can you clarify why the heat pump seems to go off altogether for several hours each day.

That is because I run in expanded mode and during those hours it is in setback (mainly because I'm trying to keep my costs in control)

Posted by: @jeegnesh

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Can you clarify why the heat pump seems to go off altogether for several hours each day.

That is because I run in expanded mode and during those hours it is in setback (mainly because I'm trying to keep my costs in control)

How much does the house cool during setback.  Unless it cools by several degrees then you are probably better off not setting back and not increasing flow temp (possibly even reducing it)

Depends on the outside temp, i'd say in the coldest of outside temperatures close to 2c other times 1c

I just checked on my controller and the NR i spoke about it actually a setting DHW Mode - which I have set to ECO.  Other settings are NORMAL and BALANCE.

Is there some other setting specific to heating side, or is it just the NR schedule which I have empty.

Posted by: @jeegnesh

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Is there some other setting specific to heating side, or is it just the NR schedule which I have empty.

Emptying the NR schedule will turn off NR mode yes.  Im not sure you have a reason to do so yet though.

Posted by: @jeegnesh

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Depends on the outside temp, i'd say in the coldest of outside temperatures close to 2c other times 1c

 

With such a small reduction in OAT you are most probably better off dropping the setback (at least during the colder months) and maintaining (or even reducing) the FT to the minimum possible consistent with heating your house.  Of course there are always exceptions to the general rule but I would certainly start there.  Remember houses lose heat because/when they are warm, not because/when they are being heated, and every kWh the house loses has to be replaced.

so my NR schedule was empty already, so NR has always been off.

My latest concern after we worked out how to get the target flow temperature corrected so it wants 41c, but last few hours run and it still won't crack 35c and i can't figure out for the life of me why.

Suggest, as a test, you turn up the WC curve a lot so any change or not is unambiguous.  I'd also set max ft to say 55 to get this parameter out of the way, we don't know exactly how this kicks in.  The min ft parameter takes effect and bends the curve before the min is reached, if the graph in the app is correct.  All just as test so you can work out what's stopping it performing as expected.

What's happening to power once per two hours.

Is the ft as measured by the heat pump or somewhere else.

the FT is the measurement coming from the Valiant home assistant plugin, i do find its 0.3 to 0.5 lower than the controller figure but its close.

the drops, I assume that is some kind of cycling going on, I need to catch that exactly when it happens and read what the controller is saying, i do not think its a defrost as I have seen that in the early am and that shoots out a bunch of smoke, if you see my earlier graph too you will see that drop/cycling.  BTW I have a 150l volumiser too.

I'll whack up the heating curve an be back with a new graph in the morning when it does its next long run and see where we are.  

BTW - thanks for taking the time to continuously respond, wish I could buy you a drink.

Posted by: @jeegnesh

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I'll whack up the heating curve an be back with a new graph in the morning when it does its next long run and see where we are.  

Don't forget to increase max ft also.  Mine is set to 55, way clear of the curve.  I think that might even have been the default.  

Some observations:

1. I for one don't know the Vaillant jargon and that makes it difficult to comment, or even understand what the problem is. I think it is house too cold because flow temp (LWT, leaving water temp) is too low, and attempts to increase the flow temp by raising the weather compensation curve (WCC) have failed?

2. If that is the case, my first thought is there is something wrong with the Vaillant controller. There should be a clear response to raising the WCC, however that is done - for a given OAT, the flow temp should increase.

3. That said, that latest chart has some very odd things in it. Why it the heat pump off (no power used) between 1500 and 1600, when the OAT was below 5°C? Why is there only a small drop in flow temp during that period? What are those big step reductions in power use at 1800 and just after 2000? Why doesn't the flow temp show defrost cycles given the OAT is in the defrost range throughout? The only normal feature is the flow temp does increase as the OAT drops, by roughly about the right amount (possibly even a bit too steep a gradient, most weather curves are in the region of one degree increase in flow temp for every degree drop in OAT), but it is always too low. 

4. These chart oddities lead to another possibility, the monitoring is somehow out. Home Assistant can get out of whack. I would double check the flow temp (using an IR thermometer) and power consumption (kWh meter supplying heat pump, if not whole property then make adjustments for other use), and then double check how both are actually measured and recorded inside HA. Charts can be extremely useful, but they are only ever as good as the data that goes into them. 

@cathoderay Regards 4 I do think the numbers are pretty accurate, the kwh reading I can also see in the myvalliant app, my energi and tesla apps and if i calculate i can always see the numbers correlate.  The flow temp I check the valliant app and it an exact match to the app and I also check the controller panel and it only ever 0.3-0.5 difference at most.

The deadspots would be because I'm not running in full weather comp mode, instead expanded with setback times.

I'll send my overnight chart in a minute, but same result can't crack 35c even though the ask was 42c

Overnight 42c target.  the first curve is my hot water tank run which shows the system is capable of high flow temp.