Mitsubishi Ecodan Weather Compensation Adjustment

At last, someone who explains the compensation curve settings properly. Have my system in 6 years and nobody explained this to me. Thanks Mark

Mark. Brilliant. Had my heatpump installed a couple of years ago but it was costing me a fortune. I now understand why. It should be mandatory for installers to explain the setting before the6 bugger off. My flow temp was set to 50 degrees right up to +10C. 🤬 Have now made adjustments thanks to your extremely clear video and I’m seeing cost improvements already while my house stays warm. Thank you my friend.

Thank you so much for this, I have been using vast amounts of electricity running at 50, this is so well explained, really grateful for this advice

Excellent video! Thank you Mark! 🙏

Great explanation thanks. We've got an Ecodan system going in soon, so this is great to know 👍

Thanks for this informative video. My unit was set at 50 degrees and minus 30 degrees. Its a H/A property and nobody has been able to explain or set this system up correctly. In the recent cold weather of Dec 22 we were using around £10 of electricity a day and we were still cold. I can't say I still totally understand it, but its a lot clearer now, so thank you for your time in doing this. I am now going to try running the system 24/7. I felt I couldn't before because of the cost. However, I still feel I am experimenting and don't know enough.

Thanks for the video, good help. Getting a COP of around 3 without using the comp curve, just using set temperature, and not sure if I should change to comp curve. The house is very well insulated and can hold heat for hours, so I don’t like the sound of the h/p running heat all day, even if it is low. The temperature setting definitely uses an auto comp curve just judging by the rad temp in cold vs mild weather, but it still short cycles a lot.

I have an 11.2kW Ecodan which was running for two years in Weather Compensation mode till Oct'23. Because it is a linear curve it never worked well because I always had to intervene once room temperature was reached by dialling down the curve by a few degrees to enable longer runs. Since the beginning of Oct'23 I switched to fully automatic (target room temp/auto adaptive) mode. After 3 months I'm amazed how much difference it has made - at least 15% better COP with like for like room/outside temps, and I have checked and double checked these results so many times now. The operation of the heat pump is so much better "managed", with more gentle startups (not so much initial power spiking), lower flow temps, longer run times, and better management of the effect of defrosting in really cold temps. You can clearly see in MelCloud how flow temps are modulated automatically as target room temp is achieved and then maintained for the longest possible runs at the lowest flow temps. Best news is that I don't have to intervene at all now - I can just leave it to do its thing all the time. Very impressed indeed with this superb piece of software from Mitsubishi.

Great video, thanks! Could you please share your flow temperature range settings?

Thanks for showing me. I get my system installed next week

Hi Mark. Thanks for the video. I am going to try your settings and see how I get on. I'm just looking for info as to what exactly the third compensation curve, the one that you didnt talk about. I have watched a few different videos by different people and none explained what it is or what it should be at. Any info on that? Thanks

Great video, at last I understand my settings

Nice video Mark!! Very informative. Can we use the wc mode during winter? I read from the manual it is for the spring and summer.

Great video for anyone trying to set up weather compensation. Yes it takes a bit of trial and error to get the correct setting or sweet spot but adding 20 room stats is not to way to control a heat pump.

awesome. just adjusted mine. Curve was active but the curve was at -15>65degrees, and lower end straight to 25, no curve at all. lets see how that goes

Thanks Mark - really helpful. I've changed my settings now try to see what happens. How do you set 24/7 heating - by the On/Play icon or by Schedule and setting this to on all the time? Also how do monitor energy used? When I press the Options menu I get the holiday suitcase icon above F4, not the energy monitor.... I have some DHW water questions too....

What about the other heating mode? Is it room influence with modulation or on-of control?

Thank you for replying. I changed the settings and put high room stat of 26.. the flow has been 47… i dont understand why its so high if comp curve is only set at 35/-5? Ive switched it back to comp curve so it runs at 35…

Hi Mark, thanks for putting the video together. I have the ecodan myself and have it on auto adaptive heating based on the installer recommendation. Uses room stat and weather compensation curve in the background I believe. Can I ask why you don’t use this one? Is it less efficient?

Thanks most informative