Okofen - starting temperature and some questions
published: 01/12/22, 13:36
Hello everyone!
We had an Okofen Pellematic Compact 18kW boiler installed in mid-October 2022. At first glance everything seems to be working since overall the installation heats up to the requested interior temperature (19°C or sometimes +1) and stops at 19.5°C and restarts when it drops below 18.5°C, therefore conforming to the programmed hysteresis.
By taking a closer look at the operation and settings, I discovered the concept of a heating curve based on the outside temperature, which raised a lot of questions. Indeed, looking at the curves (obtained on HomeAssistant by making a request on the json file regularly, but it doesn't matter) it turns out that the actual water flow temperature does not respect the setpoint at all. The setpoint requested seems to respect the heating curve but the actual temperature is much higher.
So first question: why is the heating temperature set point not respected? It seems that we systematically reach a temperature around 53°C whatever the outside temperature.
Second question: today the boiler is heating up quite strongly, the temperature is rising, the boiler is shutting down, the temperature is dropping, etc. We end up with a yo-yo effect, even if in the end the variations in ambient temperatures are not very high. I still find that you feel when the boiler cuts out. I don't know how you define a short cycle but at first sight the cycles don't seem so short to me. I finally come to the question. What would be the ideal operation? The way I understand the heating curve, we should heat constantly but at an equilibrium temperature which should allow the temperature to remain at a comfort temperature (if it is well regulated) But suddenly all the time or you are programmed in "Comfort" the water should circulate. Today there is heating and circulation of water for 2-3 hours then several hours of breaks until the temperature is too low and re-heating and re-circulation.
Finally, last question: how does anticipation work? I set the lookahead duration to 180 min but I see absolutely no lookahead.
Last point, I don't know if it is important for the analysis of my problem but the outside temperature sensor is badly placed, it is too sheltered and does not register enough temperature variation. It will be a problem for the adjustment of the heating curve but I do not think it has a link with the non-respected setpoint temperature.
Thank you in advance for your assistance! Ideally I would have liked my installer to be able to guide me but a priori not the time/desire/skills? To have gone through this a little forum I think I can find help here. I am aware that there is probably missing data so do not hesitate to ask for additional information. I have archived all the csvs for a few weeks if needed.
Have a good day!
We had an Okofen Pellematic Compact 18kW boiler installed in mid-October 2022. At first glance everything seems to be working since overall the installation heats up to the requested interior temperature (19°C or sometimes +1) and stops at 19.5°C and restarts when it drops below 18.5°C, therefore conforming to the programmed hysteresis.
By taking a closer look at the operation and settings, I discovered the concept of a heating curve based on the outside temperature, which raised a lot of questions. Indeed, looking at the curves (obtained on HomeAssistant by making a request on the json file regularly, but it doesn't matter) it turns out that the actual water flow temperature does not respect the setpoint at all. The setpoint requested seems to respect the heating curve but the actual temperature is much higher.
So first question: why is the heating temperature set point not respected? It seems that we systematically reach a temperature around 53°C whatever the outside temperature.
Second question: today the boiler is heating up quite strongly, the temperature is rising, the boiler is shutting down, the temperature is dropping, etc. We end up with a yo-yo effect, even if in the end the variations in ambient temperatures are not very high. I still find that you feel when the boiler cuts out. I don't know how you define a short cycle but at first sight the cycles don't seem so short to me. I finally come to the question. What would be the ideal operation? The way I understand the heating curve, we should heat constantly but at an equilibrium temperature which should allow the temperature to remain at a comfort temperature (if it is well regulated) But suddenly all the time or you are programmed in "Comfort" the water should circulate. Today there is heating and circulation of water for 2-3 hours then several hours of breaks until the temperature is too low and re-heating and re-circulation.
Finally, last question: how does anticipation work? I set the lookahead duration to 180 min but I see absolutely no lookahead.
Last point, I don't know if it is important for the analysis of my problem but the outside temperature sensor is badly placed, it is too sheltered and does not register enough temperature variation. It will be a problem for the adjustment of the heating curve but I do not think it has a link with the non-respected setpoint temperature.
Thank you in advance for your assistance! Ideally I would have liked my installer to be able to guide me but a priori not the time/desire/skills? To have gone through this a little forum I think I can find help here. I am aware that there is probably missing data so do not hesitate to ask for additional information. I have archived all the csvs for a few weeks if needed.
Have a good day!