Found online. That looks like it has a rounded edge to determine valve orientation.
So if fitter upside down, the installer would’ve had to rotate the valve 180 degrees to fit the other way around
Yes that 180 degrees rotation seems to be what has occurred. The valve spindle can rotate over 360 degrees so they have moved it through 180 degrees to get the head to fit.
I’m not clear what this 180 degree revolution does to the internal of the valve.
To eliminate it I might just bite the bullet and switch the brass fitting the correct way.
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I am going to switch this around, no amount of orientating the spindle seems to correct the problem…I am just going to wait for it to be a little warmer just in case it doesnt all go back together well!
So onto what I think is my next installation problem…hopefully some fellow nibe users with the same setup can confirm how theirs is and if my understanding is correct.
I am getting a failure to reach temperature during my periodic increase of the hot water. This seems to have been happening since I got nibe uplink running so I assume its another installation problem. Something seems wrong with how the immersion is connected to the SMO40 via the Nibe HR10 contactor box.
This suggest the immersion “auto mode” on the nibe HR10 box needs to be connected to pin 6. Mine is connected to pin 2.
I know the immersion works as when I flick the HR10 box to “on” the CT clamp on the circuit feeding the immersion shows it is pulling approximately 3kw.
I am also not clear how this should be set up in the service menu option 5.1.12 and I dont know what step 1, step 2 or step 3 means in terms of additional heat. On my set up I dont have any other sources of additional heat other than the immersion in the DHW tank.
As always any examples from working set up or Nibe general knowledge on this subject is greatly appreciated.
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Evening
Mine used to error with that. I then set my periodic increase to start at 3am, which is during the time my DHW is programmed for. Hasn’t errored since.
Additional heat is not linked to the DHW cylinder. It’s to do with whether you have an additional heat source before or after the reversing valve on the CH loop.
Eg mine is programmed in as after the reversing valve and single step, as I have one immersion in the buffer tank.
There are no options to specify DHW additional heat as far as I’m aware.
Re wiring, here is how my tank and buffer is wired:
So pin 6 is for cylinder immersion and pin 2 is for additional heat pre / post shuttle valve
I’ve just started looking at the my uplink data and I’m quite shocked at the behaviour of the heatpump vs what is being report for the buffer / CH circuit!!
Ok, looks like I need to shift my wiring to pin 6 as a start. That’s what I suspected.
Out of interest, how are you scheduling DHW? I can only seem to schedule a comfort level at a specific time.
The data has been invaluable for me to sort a lot of problems, suspect I’ve a few more to go yet. One at a time.
If you can / do graph it then please post, I’m very interested to see how other Nibe units perform. I can see a few other Nibe units on heatpump monitor but those only show flow and return and power. They certainly have different characteristics to mine, mine seems to run like @dMb but more often and with greater power consumption - but then I don’t have a passivhaus and I have a 16kw unit so probably to be expected.
Morning
I schedule a comfort like you do. So I have it as off from 5am - 2am then 2am - 5am I have it as luxury. (50 degrees).
Then I set periodic increase to 3am
What settings do you have in the additional heat menu, as mine I have to specify one - eg before or after shuttle valve. Won’t let me pick none.
The 1,2,3 step is slight confusing tbh. Eg in my menu it’s after shuttle, 1 step, 23amps. Yet my immersion heater is 3kw and on a 16amp MCB. So I think I need to change that.
Personally would rather block it permanently as it’s less efficient. I think my additional heating is blocked until -7 outside anyhow.
Yer, should be pin 6 or it will think it’s an additional heat immersion on CH side.
Here you go
This is the heatpump side - flow, return and pump speed.
This is the buffer side, request flow temp, flow temp and return temp
The latter is all over the place, vs heatpump which looks relatively ok, although it never seems to run a dT7 and pump spends a lot of time at 100%.
This was yesterday, after raising the curve slightly:
2 posts were split to a new topic: Help with Nibe F2040 12kW SMO20 system