Tado <-> Inventum heatpump: Can I modify the OT signal?

[jrs]

Sure, forgot to upload them last night.
Here are the log covering the starting period of the heat pump.

[hvxl]

I don't find an explanation in the log for the behavior of the heat pump. It's strange to me. One of the options for people who want to save energy is to get a heat pump. It is not very helpful if that device then is very wasteful.

I'll look into adding a command to modify the room setpoint that is sent to the boiler.

[jrs]

Thank you very much for checking the logs (again) and considering the new feature.

I'll solder the second otgw this weekend and collect the logs from both of them (and share them).

[jrs]

I've added the second OTGW in between the heat pump and the actual boiler (Remeha Calenta), a weekend later then anticipated :p

I can't seem to get otmonitor working on the second OTGW, it does receive messages but I'd notice the output from to OTGW seems different. The only difference is that this OTGW is installed with the wireless board instead of the ethernet one.

The webinterface does tell me it's the same firmware on the OTGW chip:

Code: Select all

OTGW PIC Firmware Version6.2
OTGW PIC Device IDpic16f1847
Compiled on (date/time)May 30 2022 08:35:36

What am I doing wrong, anyone can tell by looking at the logs? I've posted the last 500 lines of the log from this OTGW device.

[hvxl]

Looks like you connected to port 23 (ESP debug port) instead of 25238 (serial proxy port).

[jrs]

Ah, that indeed was the case. I'm sorry for my stupidity, I must have skipped something in the manual.
I'll collect some logs and post them logs from both devices tomorrow

[jrs]

After having both OTGW's running for a day and taking a look at both logs, it seems like the heat pump is passing on all the messages unmodified. I couldn't find anything that is changed from to logs or from the graphs created by otmonitor.

With the information from this thread I can now see a clear pattern, the heat pump does react on the room setpoint and room temp:

Screenshot 2022-12-19 at 19.58.28.png (117.06 KiB) Viewed 4708 times

As promised, I've included the logs from both my OTGW's:

• otlog: tado <-> heat pump
• otlog2: heat pump <-> remeha calenta

[hvxl]

Firmware 6.5 has a new BS command, that can be used to manipulate the room setpoint sent to the boiler.

[blb]

Hi Schelte, I just upgraded to FW 6.5 with the new BS command. Great! Would it be possible to have a command to manipulate the room temperature as well?

This is very useful as my Honeywell Evohome Zone Thermostat is not setting both room setpoint and room temperature values, I guess due to the fact it is controlling multiple rooms which could have multiple setpoints and temperatures.

I'm trying to link my evohome thermostat as direct as possible to my panasonic heat pump (with heishamon interface in between)

[hvxl]

The BS command is intended for boilers that don't honor the control setpoint when the room temperature is above or around the room setpoint. This is incorrect behavior of the boiler. But by being able to manipulate the setpoint value that gets sent to the boiler, you can make the setpoint higher than the room temperature, or make the room temperature higher than the setpoint. I don't see the added value from being able to manipulate the room temperature value as well.

[jrs]

Firmware 6.5 has a new BS command, that can be used to manipulate the room setpoint sent to the boiler.

I noticed I've never replied to this post, sorry for that !

My heat pump does indeed respond nicely to the BS commands sent via homeassistant:

Pasted Graphic.jpg (62.83 KiB) Viewed 1952 times

After a 'cooldown' period (I guess) it started the pump again.

Thanks a lot for your insights and effort!