Heizungskontrolle mit HomeMatic HM-TC-IT-WM-W-EU und HM-CC-RT-DN

[alex]

Hello all,

I recently changed one room from FHT80B devices to homematic thermostates. I also have an FHT8W device that controls the CV (central heater). Obviously the homematic device cannot connect to the FHT8W so I need another solution that turns the CV on and off.
In the wiki I found an easy solution but as it states in that article, it only works with the older homematic thermostates. (http://www.fhemwiki.de/wiki/Heizungskontrolle_Einfach_mit_HomeMatic_HM-CC-VD)

Is there a similar solution available for the HM-TC-IT-WM-W-EU and HM-CC-RT-DN thermostates?

Thanks for any help,
Alex

[martinp876]

The New solution is that the valvecontrol is in the RT. The TC just measures temp at A remote location and seines Desired temp.

The TC can controle A 2point device. I.e. an on/off type. You can simulate this receiver with A virtual device and Generate a notify that feeds your heater. Would this help?

[alex]

Hi Martin,

Well, it sounds like a good solution, and I saw that chan07 is some sort of switch, but I wouldn't know how to configure this is FHEM in a way that it will switch on/off the heater. And I tried to find a piece of code in the forum/wiki but couldn't find anything. So if you could help me with a piece of actual code that makes this work I would be very thankfull.

Alex

[Bennemannc]

Hello,

what about the HCS Modul of fhem. From the commandref:
HCS defines a virtual device for monitoring thermostats (FHT, HM-CC-TC, MAX) to control a central heating unit.

Regards Christoph

[martinp876]

I would expect than the 2point control is a little more intelligent and provide some like pwm for the heating. However, just a guess.
First you need a virtual channel which will be the pseudo actor. Peer this with channel7.
In chn2 you can find reg heatcool which is user to invert the data provider.
Now you should receive the trigger. I just read that the latest fwupdate 1.3 has some improvements here. I would assume a periodic message from the TC with the latest fw.

I assume looking at the trigger coming after the setup you can Assemble your notifies yourself

[alex]

Hello Martin, Christoph,

Thanks for your help. I had a look at the HCS module at that seems to be the perfect module for controlling the central heating. With the ability to both check the FHT as Homematic devices I can replace my FHT8w with a simple battery-powered switch (HM-LC-Sw1-BA-PCB) and let fhem decide when to switch my heater on/off. I just have to make sure that the computer keeps running in the winter

Kind regards,
Alex