You need to manually add the repository. Custom Repositories - HACS. GitHub - gerione/daikin-ha-ekrhh-modbus: Modbus connector for the ekrhh home hub
Power limit will be configurable on the next version. Probably in one week
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Hi @gerione,
Great work here, investing so much time to give to the community.
I have just bought a Daikin altherma 4 air/water heat pump(the combination EPSX10P50A-EPSK08AW1). Based on some googling and your post here I looked into the Daikin home hub (ERKHH) to connect HA>your integration>EKRHH>EPSK08AW1 though nowhere found documented that those components are compatible. In my search I eventually ended up with a very friendly guy from Daikin Netherlands who told me that for the Altherma 4 no EKRHH is needed (and not even compatible anymore) Instead the indoor part (EPSK08AW1 in my case) is able to talk modbus directly.
So that sounds great, one less moving part, and over 300 Euro saved! I got the interface specs from him which for unknown reason is not documented anywhere online. Quickly glancing over it, it seems to match the modbus spec of the EKRHH. with a bit of luck i should be able to just point your integration to IP i am getting from the heatpump once i have it connected.
here a screenshot
or would that be too optimistically?
Next week all gets installed so as soon as the thing is powered up i’ll connect it, of course will share here.
Anyone else having experience in connecting the Altherma 4 heatpump of Daikin?
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Hi Dave, Jon overhere (also from the Netherlands). The Altherma 4 will be installed mid december at our side. I was also researching the HomeHub, Daikin answered that the hub will be available july 2026. For me it is also far more interesting to use the modbus directly like you have found out.
Would it be possible to share the complete list?
And just a question; is connecting the Altherma 4 via LAN with my network sufficient for using modbus… or do we need to use P1/P2 ports or something like that?
Hello,
I intend to purchase the Daikin Altherma 3R EHVH08S23E6V. From my understanding, using this integration and the EKRHH would be the simplest way to integrate it in HA. Would someone be able to confirm please ?
Hi Jon,
I am still quite busy with the new house. Also the heat pump has unfortunately issues (self inflicted i am afraid). for now i will share the holding register that i worked on. the rest of the excell contains personal comments from Daikin people which i can imagine is not for public consumption. in th epdf print of one of the tab of the excel i have:
marked RED > registers that AL4 (altherma 4) is not using anymore (compare to EKRHH)
marked yellow > NEW registers that AL4 is using (and where not there in EKRHH)
aim is to complete the full spec (so also input, coil etc) of what is the difference between this integration and the changes that would be needed to make this integration integrate directly into the altherma 4.
note; my EPSX10P50A is 90% ready, next week the installer comes to finish (i hope). I already found an RJ45 connection almost hidden on the circuit board.
yes, i think the same. you can check the installer reference guide here for info on compatibility and more https://www.daikin.eu/content/dam/document-library/Installer-reference-guide/heat/accessories/ekrhh/EKRHH_Installer%20reference%20guide_4PEN744838-1D_English.pdf