No, not really, I think they prefered that we call them for every adjustment.
This is just one page of many from bsb-lan controls, but also why Iām reluctant to play!
Hi there, Franceās Chamonix heat geek here! Just because I passed a difficult course doesnāt mean I know everything mindā¦!
Looking at your charts have I read it right in that the flow to the radiators is cooler than the UFH?
Describing the UFH as the mixed circuit is normal, as normally the flow from the HP would go straight to the rads (hotter), then be blended down to the UFH. The flow is quite low temperature already, where are you in France?
Itās hard to say specifically how to optimise your system without knowing the hydraulic layout.
Where is the blending happening for example?
If you can trace the plant area pipe work layout then we can see what the 2 circuits are made of that would help.
In France, hydraulic separation is the norm, Iāve had it rammed down my throat really hard as the only way to do heat pumps, but having done the heat geek course I know better! Iād expect you to find a buffer vessel in the system, providing hydraulic separation. Le famous ballon tamponā¦
Some good views above, agree! Particularly about getting the curve/slope right so you can have all the TRVs open most of the time. 1.3 sounds very high, if thatās what that table shows.
Sounds like the installer is still engaged?
3 Likes
Helllo I`m from Bulgaria. I also have Atlantic Alfea with BSB Lan 
. Have you got moniotring on the heating energy production and electric consuptin also? I had alot of problems with my Alfeaā¦At the beggining started with COP 2-3 and now getting atleast 30-40% betterā¦Forgot to mention - My house is all on radiators.
Hi there Phil, thanks for the post, sorry, itās been a busy weekend and i wanted to reply a bit better than i have been doing up to now in the thread so far.
For your first question, i think it might depend the operating mode for each circuit. In this snapshot from yesterday, it looks like the temps for rad āreduced modeā (low) is similar to ufh ācomfortā mode- (high) -Am i right that this seems to be a french way of controlling heating thatās different from UK?
I live close to Macon, north of Lyon, i imagine you have driven by going back and forth to Chamonix at some point?!
This is the circuit for the basic configuration with 1 circuit, i am trying to find the same for the dual circuit. But this should be more or less correct for the UFH part.
I believe that i do! a small red vessel a bit bigger than a football.
I havenāt managed to operate for more than 1 night with TRVās open because of the flow noise!! it sounds about 3x louder than someone breathing heavily and is quite hard to ignore, i had to give up during the night and close down the TRV again. Too much flow? reduce the slope?
Actually the system has been installed since about 2016 - 9 years, with no outside intervention. I have replaced the valve that diverts from DHW to heating system as it was sticking open and cleaned out the pots that collect debris but other than that itās been running heat in winter and cooling in summer. Time flies and funds are low! (4 kids) - so any pointers or suggestions are welcome!
Hello Ivailo, I saw some of your posts when i was studying the forum before posting. thanks for commenting! Currently i donāt have heat energy monitoring or electrical consumption, just the BSB-lan system and some extra temp probes attached to a esp-8266. What has helped you so far?
Hi, Belgium here 
Installed my heatpump this summer after looking at all videos of HeatGeek and UrbanPlumber YT channels, all is there !
Iāve 140 sqm UFH and 5 Rads, in 1 zone and untill now, we still have warm 
looking to your graph, indeed, your flow temp to rad is too high.
Also I guess itās in variable mode for this Rad loop ?
Comparing to my setup, Iām on lower curve, same for UFH and Rad, but we donāt know how insulated is your house, you should lower the curve from 1.3 to ā¦ (I guess 0.5) untill the desired required temp is reach but is no longer above WITH TRVs full open, and lower the speed to an inaudible state, I would try that first.
I see itās scheduled ādayā between 4:00 to 10:00 and 16:00 to 0:00.
Iām to keep the same temp demand 24/7,Itās high power demands during restarts, it kills the COP, and this will help to lower the heat curves
1 Like
Is this not the expansion vessel that maintains pressure in the system? It will be connected via a single pipe.
A buffer would be a little larger, with 4 pipes connected to it plus an second pump. This isnāt shown on the schematic, but could be integrated inside the hydraulic unit.
2 Likes
Actually I found a bunch of problems. The main one was that when starting HP forced the modulation to 100% and that way overshooting the setpoint. One reason for this was that my HP is oversized but at the other side it was the settings of parameteres 2862 Heat pump - Locking time stage2/mod and 2873 Heat pump - Compressor modulation run time. After correcting them I had a significant improvement of COP. Trough the recent year corrected a lot of other parameteres that Atlantic never touched - Building time constant, corrected some of the sensors because of wrong readings and at this moment the HP works almost perfectly. I can give you the manual of Siemens RVS controller where all the functions are explained. Also found problems with the fan RPM which are not corelated to modulation % and below 4 degrees fan runs to maximum revs nomatter modulation %. Also there is a constant problem with the EEV setting when HP makes cold start and ruins the COP.
Hi Ulric, Thanks for joining the party! If only our governments could cooperate as well as happens here, we would all be better off (and maybe brexit wouldnāt have been needed 
)
Thanks for the info, which heatpump did you install?
Yes, the radiator loop is in variable mode - i assume that is to offset for TRV states when in use?
I will try to lower the curve and see what temperatures i will get. Then i can reduce the flow to see how that affects it. ( hopefully make it a lot more quiet!
My house is quite well insulated, only built 9 years ago. Certainly a lot better than any house i had in the UK!
Thanks again, great info to give me confidence to move forward.
1 Like
Oh yes, i think you are right! sorry, i will check again.
thanks!
I really do need to advance to the point that i can calculate COP to have a better view on what is happeningā¦ so i guess power monitoring and flow rate are missing from memory?
I noticed that there were a lot of functions that Atlantic werenāt touching also.
I will have a look at the values you have mentioned.
I would like a copy of the siemens doc if you still have it available thanks.
1 Like
Hello again. Here is some graphs from the last 24 hours, i have reduced the variable pump speed, and also the slope several times, currently down to 0.7, and much less noise with the TRVās open.
Should i be concerned about this cycling? or is it not too excessive?
Thanks in advance for any thoughts, opinions and comments.
More than 3 cycles per hours is cause for concern, and will shorten the life of the compressor.
Between 13:00 and 15:00 is okay,
but 19:00 to 23:30 is way too often.
UFH has been off for most of the day, so only the rads are able to ācoolā the heat pump. 30Ā° is way too low for these radiators.
Whatās the rated output of this heatpump? How many radiators do you have?
4:30 to 5:00 has both UFH and Rads on at the same time, and flow temp runs nice and stable at 30Ā° until DHW reheat.
7:00 - 9:00 is trying to run UFH and Rads at 27Ā°, and failing.
Thanks for the analysis. I believe itās 6KW, and i have 4 radiators, i had been running with 1 of them closed off in a spare room, so i have opened that up full for tonight to see if that helps.
What are you thinking? oversized like almost everyone else that has a heatpump from what iām reading?!
When both UFH and radiators are open at the same time, then the heatpump seems to be sized correctly for 10Ā°C ambient (hard to be sure without seeing power data). When only one circuit is open, specifically the radiator circuit, then it seems thereās not enough surface area to shed the heat coming from the heatpump, hence the cycling.
Making sure all 4 radiators are open will help. You may need to run them hotter, and then have the room thermostat stop calling for heat when the rooms are warm enough (not TRVs!)
1 Like
Figuring out how the radiators call for heat is key.
Thanks, according to the document, it is controlled by the weather, but with room thermostat to stop calling for heat like you said, except that i donāt have an additional room thermostat on the radiator side of the house.