Replies: 13 comments
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Interresting configuration. Does ems-esp work with two CW100, it was a theroretical option and noone has ever checked. Can you please post the full system configuration ( Manipulating the sensors was discussed in emsesp/EMS-ESP#558, maybe for the roomtemperatures you can try with changing the calibration of internal sensor, but the command for CW100 is unknow, you have to figure out. The mixer is not writeable because normally the thermostat writes to mixer and will overwite any command. If there is no thermostat i think a write is possible. ems-esp ony reads the mixer status, the set-command have to be figured out. Replacing the thermostat was discussed in emsesp/EMS-ESP#524, but for now there is no solution. |
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full system configuration:
The setup with the 2 heating circuits (ground floor/1st floor) is in place because the Junkers approver said it was required... Manipulating the sensors or soldering some extra components on the thermostats doesn't really feel like a stable/maintainable solution... I'll try to reverse engineer the commands that the thermostat is sending to the mixer. Ideally I would be able to send those commands straight from Loxone to the mixer. |
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In my opinion it would still be better if you could somehow drill some holes and add wiring to put the thermostats where they belong, so the system regulates itself fault-free instead of relying on external input from a home automation system that runs on a SD card. |
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Is this a house with just floor heating or do you have radiators as well? My floorheating is just managed by outside temparture sensor and respective heating curve parameters. A hydraulic volume flow adjustment per room is certainly needed. Floorheating set temperature is not controlled by RC310 temp sensor within living room. The outside temp sensor must be outside. You just need 2 thin wires to a location without direct sun. I you do not want wires then you need to buy and install the Buderus radio frequency controlled devices: Just for floorheating you will find rf controlled room sensors and the respective rf controlled servo controllers per room. |
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@bbqkees Absolutely. I've lost a couple of SD cards on my RPi3b. I'm not planning to make the temperature in my house (and by extension my fellow inhabitants' happiness!) dependent on equipment that is not manufactured or tested to a reasonably industrial standard. |
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Thanks for all the feedback! For the outdoor sensor, there might be a way to get the sensor outdoors. I cannot (for the sake of the happiness of my fellow inhabitants) grind new cables in the wall to put the indoor themostats in the perfect place, although I can improve their location a little bit. I'll look into the wireless thermostats, maybe that's the solution for me! I was hoping I could bypass this because I already have these temperatures in Loxone, I just wanted a way to push these values to my heating system... Now I need a whole bunch of costly, redundant, vendor-specific devices to execute logic which I can also do on the hardware I already have... @tp1de It's actually 1 device (MM200) with 2 heating circuits (visualized as 2 misers on EMS). I have just floor heating, no radiators. The installer split it into 2 "large" circuits for some reason. There are 14 "lowest level" circuits, which I don't control individually (other then balancing the flow rates). Just for the record, some more info about my installation (because I have the feeling there are some misconceptions about Loxone): My install is running for 5 years on the same SD-card without issues. |
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@mtvw Nevertheless for floorheating you will have one or more heat distributers for the different heating circuits (1-2 per room). On the heat distributers there should be servo motors for each circuit which control the volume flow per room. Each of this servo motors is then linked via a master controller to a temperature sensor in the room (by cable or radio frequency). What do you want to do? Control of temp per room (in Germany this has to be done for all new installations by law) - or setting the buderus flowtemp for all rooms on the heating circuit per mixer just by the temp of one room measured by cw100? |
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I thought about how Bosch manage it to use a zigbee outdoor sensor (T1RF) instead of the boiler mounted outdoor sensor. The boiler sensor is only published on ems and not writable (btw: for ems+ we do not know the the outdoor temperature, i guess it's pos 4/5 in telegram 0xE5, but that's not confirmed, maybe someone with E5-telegram and sensor can check). @mtvw If you want to build your own thermostat you mainly have to calculate the circuit flow temp by outdoor temperature (heating curve), by room temperature or by both. Than you have to send a command to the mixers and the boiler. The boiler flow temp is usualy ~5 degree more than the mixer-flow temps and there is a boiler command in ems-esp. For the mixers the commands are unknown for now. You have to watch which commands are send from thermostat to mixers (e.g. watch on 20). I saw somewhere in summer the telegrams:
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@mtvw First decide if you would like to control your heating system by outside or room temp. |
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@tp1de : I don't recommend it. I only give technical information how the thermostat in general works. I also don't recommend to make hardware modifications to spoof temperatures, but it's possible to do so. It's up to @mtvw to decide what he want to do if he know all possibilities. |
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I do have floor heating and radiators. In some rooms both. The floorheating is reacting very slow on temp changes. The radiators are equipped with homematic thermostats. What I do by my ioBroker home automization system is changing temporarely the "temporary room setpoint" to off (-1°C) to avoid overheating by strong sun radiation. I still do this by rest-api requests to the km200 gateway. This is complicated because has to be encrypted. Maybe in future by ems-esp. There are pro and cons. But I do not know always know which km200 datapoint corresponds to the respective ems-esp data point and vice versa. |
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Thanks for all the information! I'll start by moving my outdoor sensor to a suitable place outdoors, and evaluating the impact on my temperatures. Maybe it will be enough to stabilize everything. I don't need to control the temperature per room on demand. As it's floor heating, it's too slow anyway to have granular control. The custom thermostat approach by @MichaelDvP seems like an interesting project for when I have more time :) But I'll start by storing the telegram details for future reference. Thanks for the kickstart! The ideal system should not only keep track of the current outdoor temperature, but also keep in mind the temperature forecast + cloud coverage. But that's a project for when I have a lot more time... |
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I will be very interested in your thoughts. My primary heating for hot water is solar with my gas boiler there to heat it if there isn't any sunshine. In the summer that's fine, and in the winter I heat water in the early morning for the whole day. However on at least 50% of days there is some sunshine so I don't need to use as much gas to make hot water to meet our needs. So I'm interested in day ahead solar radiation forecasts which is clearly related to day ahead cloud cover forecasts. At the moment I haven't found much discussion about this subject, so keep us posted on your progress. |
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Question
I want to use the temperatures from my Loxone system to regulate my heating. But I can't find a command that can do that... Looking for a solution or a workaround.
Screenshots

My setup:
Additional context
I don't really need my thermostats or outdoor sensor. If I can bypass them somehow and regulate the mixer directly, that works for me. Or if I can override the temperature sensor of the thermostats, that would be even better.
I have tried
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