Climate Solutions Community

Hello, I have installed a Viessmann VitoDens 200-W B2KB-26 boiler with climate control and Tado system for modulation and remote control. I decided to add a solar panel for the production and storage of domestic hot water. Not having much space available near the boiler, I am forced to install a panel with integrated boiler and natural circulation (Vitosol 111-F). In the little space available near the boiler I would like to install a second 60/80 liter domestic water boiler to be heated by the boiler when the water in the solar panel boiler is at low temperature and through the recirculation of the hot water present in the solar panel when this is hot. I thought of using the additional SM1 module by connecting: - the recirculation pump to terminal 22 - the storage tank temperature probe on the solar panel at terminal 7 - the temperature probe of the second storage tank on terminal 10. A solution like this can work by setting all parameters directly on the VitoDens 200-W boiler. Thanks in advance   Federico Gamberini ... Mehr anzeigen

Good morning, I installed a Viessmann VitoDens 200-W B2KB-26 boiler with climatic adjustment and Tado system for remote modulation and control. The system includes 11 thermostatic valves, thermostat, bridge and extension kit. I have a clarification to ask: 1 - When the system is at full speed and the rooms are at the required temperature, all the thermostatic valves on the radiators are in closed position and as there is no heat request the boiler switches off the burner leaving the water pump turned on for circulation. Since all the thermostatic valves are closed, the pump circulates the water only inside the boiler by-pass. If, afterwards, there is a request for heat from one of the thermostatic valves on the radiators, the burner turns on, bringing the heating water to 65/70 ° C in a few seconds and also emitting a loud noise of water almost in boiling. Then turn off for a few minutes and repeat this operation several times. The boiler in 806 hours of operation carried out 12672 burner starts. Approximately 1 start every 4 minutes. I tried to follow this operation and I saw that the burner, even with a minimum heat demand, brings its own combustion set to 60% by clearly boiling the little water available in the by-pass. I tried to remove a thermostatic valve leaving therefore a radiator always free to receive water and the problem was greatly reduced. But it is not a solution that I really like. I also asked the technician who installed the boiler and he also suggested that I leave a couple of radiators free in order to always allow the circulation of water. Do you have any suggestion in terms of boiler parameterization to mitigate this phenomenon? Or should I provide for the installation of a differential by-pass valve between the flow / return manifolds? Thank you Federico Gamberini ... Mehr anzeigen