Your other option would be to try increasing the modulation as that should lower the flow temperature off of the weather dependent curve as you reach the desired room temperature.
Fair warning mine is back in 5 as I found it a bit hit and miss from my experimenting but I am still waiting 4 replacement radiators so will be playing again in a few weeks.
Hi all, recently had a EDLA08 installed with the Madoka but no additional monitoring as yet.
Have been playing with different settings but with the wild changes in temperatures recently Iām struggling to figure out whether LWT or tweaks I make are any improvement.
Would you mind sharing the latest weather curve settings youāre using to give me a fresh starting point?
I will upload an export from my MMI after I have finished another Air purge. That should show you all of the settings I currently have configured.
Just remember that your WDC should be based on heat loss calculations and the minimum Radiator output and then fine tuned to suit your requirements / how hot you like the property.
While you can just copy settings from another unit this will likely not be suitable for your house and could leave you with a worse COP.
Be sure to take a copy of the MMI Export (from the installer menus) before making changes so that you are able to revert if needed.
Interesting item I have found this afternoon, Dropping the DT from 5 to 3 has given me a more consistent run with higher flow rate and less of the bouncing up and down in modulation when running.
My run at 14:20 stabilized around 15:30 and then until I started an air purge at 16:40 it was consistently better with modulation in flow rate (actually running above minimums 6-7l/m) and stable DT.
The house still seems warm and the COP is higher and more stable. May be worth looking into for the smaller Daikin Units.
Ahhh interesting finding, I did experiment with both larger and smaller dTs previously (+/- 1C from 5C which is my default), but to be honest I was changing other settings at the same time, so my tinkering was not that scientific, as it seemed that a change in dT didnāt make a difference to the āsaw-toothā power usage that I saw of my system.
I spotted yesterday that the 6kW Altherma in Whitchurch (same size as my HP) was running with dT of ~3C and was also able to run flow temps ~28C consistently with draw of ~300W, getting long-runs with COP around 5. My system cycles as soon as I set below 31C and a draw of ~420W seems to be my minimum level at the moment, will experiment with a lower dT and see if my heat pump settles like yours.
The upcoming forecast is really good for experiments with this system with highs around 10C and lows down to -2C for the next couple of days in my area.
Sorry for the delay here,
My current settings are attached here.
This includes the DT 0f 3 but I have yet to see how this behaves fully on the coldest days.
Farnborough,Hampshire_March06-EDLA08E2v3_DaikinMMI-export.txt (6.8 KB)
Again this is what is currently working well in my house, please do not take this and just copy paste as it may not be suitable for everyone.
Before making changes please backup your settings and make notes so you can revert them if this breaks anything.
How did you get on with updating the DT, di this help in your situation at all?
Is the settings export standard on the MMI? I donāt think Iāve ever seen that in my installer menu - do you need to plug in a USB?
It is at the bottom of the installer menu. You need to plug in a usb stick that is fat 32 formatted and you can save the configuration but cannot re import a configuration file.
I think it works thanks @KnightPhoenix, just one change setting the DT to 3 - after one heat cycle with similar outside temps the COP appears smoother and higher -
Yes I did make the change to a dT of 4 (from 5) and I would say that it has slightly improved COP and slightly reduced energy consumption which is definitely a win:win!
As you mentioned, I see my 6kW unit modulate flow rate much more readily with this lower dT, before it would just stick at the lowest possible flow ~6.75 l/min.
Iād like to further reduce to a dT of 3, to see what impact that has. But before making that change, itād be really useful if the ability to compare a system on heatpumpmonitor.org was working again (to empirically compare the data of the system to itself, rather than going from gut-feel and assumption).
Thanks for sharing Zak. Ours is a retrofit and Iām having to judge things from the Daikin controller and our solar setups electricity usage monitoring which seems less than ideal.
I had noticed that my flow rate sticks at 7-8, thought it might be that the filter was full, it needed a bit of a clean but wasnāt too bad. Dropping dT to 3 has doubled flow rate, efficiency looks better though energy usage up.
Any recommendations for running pump as continuous or sample? If sample is the 60% setting the consensus?
Donāt worry, I am on heat pump 2 and in the middle of doing a lot of renovations to the house.
I have not set any pump restrictions and you will be able to check this from the export above, all of the codes in the export are listed in the installer reference guide available from Daikin (or Google āDaikin edla04-08ev3 installer reference guideā).
My only concern with the lower DT is how the system will perform on cooler days. Hy hope is that as it is in fancoil the system will just let the DT spread as needed and keep the house warm but unless I get another cold day this year it may be a while before I can confirm.
Still seems to be running a bit high as the room temperature is still creeping up (all be in by 0.1Ā°c an hour or so) so may have to dial in the WDC some more.
