Tado - OpenTherm issues
Hi,
I recently replaced my boiler with an OpenTherm setup. I'm having issues with big temperature drops whenever most of the heating is turned off. I hope someone can shed a light on what might be wrong.
- Setup:
○ Wired smart thermostat connected to Bosch GC 7000iW-28 C with Bosch Opentherm convertor EMS-OT (7746901847)
○ 5 SMT's configured to use the wired smart thermostat as zone controller
- Issue:
○ When multiple SRTs request heat, the boiler goes into full power and rooms heat up quickly
○ When only one SRT requests heat, the room heats up slowly with 'medium' boiler acivity, which still makes sense since it's meant to be economical
○ When all thermostats but one stop requesting heat, the remaining room slowly cools down and the boiler will only activate after a 2-3 °C temperature drop. This highly unconfortable in my home-office situation.
- Workaround:
○ Turning on other Smart Thermostat -which is only meant to be a controller in this setup- to a (much) higher temperature than the actual room temp triggers the boiler to go full power resulting in the single room back up to the temperature.
- Question:
○ Is this normal OpenTherm behavior or is something wrong with the setup?
○ Could it be this is because my boiler is no longer detecting cooler return water and therefore kicking in too late?
○ Could this be a Tado - OpenTherm or Boiler issue?
I'm adding a picture that clearly illustrates my issue
Thanks for your help!