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demiano
Hi, i'm new to this forum and hoping for advice on my CH setup.
It's my first personal heating system so my knowledge base is lacking, but I tried to be as much involved in installation process as possible
The setup for my central heating:
- WB Greenstar 15i condensing boiler (Greenstar 15i System - Worcester, Bosch Group UK homeowner site)
- WB FW100 weather compensating controller (FW100 Weather compensation controller - Worcester, Bosch Group UK homeowner site)
Heating is delivered mainly by underfloor heating and 3 rads in bedrooms (house is brand new, well insulated and quite small - 1100 sq feet) I've set "heating" interval temperature to 20 degrees and "saving" interval temperature to 17 degrees. Outside temp. recently is something around +3 degrees daily average. Max flow temperature is set to 60 degrees.
My concern is that the boiler is approaching the set temperature but never reaching it and burner is constantly on (while on "heating" interval of daily programme). I understand that burner can only modulate down to 35 degrees flow temp. And while it's still quite warm outside, demanded flow temperature is shown only 27-30 degrees (by controller). Boiler sticks to that temp (displayed on boiler showing actual flow temperature). It seems to me that boiler is wasting gas, trying to stay on all the time by any means, because it simply can't modulate less than 35 degrees (it even turns off the pump sometimes, but burner is still on). Shouldn't it just reach designated room temp and turn off, wait till it drops, say 1 degree, and then turn on again? Room temp is staying 0,5 degrees lower than set temp (if set at 20, boiler keeps it at 19-19,5, constantly burning gas and not reaching 20 seemingly on purpose). When programme switches to "saving" interval, it turns off and cools down (though usually room temp drops only 1-2 degrees during this interval until next heating phase comes, so boiler stays off for several hours). So I "solve" this problem by adding shorter heating intervals in the programme, but it seems to me as dumb work-around for a decently smart system. It's kinda annoying that boiler works that way, because having a decently insulated house i'd like to see boiler heating up rooms to, say 21 degrees, and turning off untill it cools down to 19,5 (it would take at least 1-2 hours, not just a few minutes) so average of 20 degrees is maintained during "heating" phase. Gas usage isn't big, but if it can be smaller - i don't mind
Is something wrong with my setup and/or controller settings or that's how this boiler is supposed to operate, is this more energy efficient or something?
Explanations and advices will be much appreciated!
It's my first personal heating system so my knowledge base is lacking, but I tried to be as much involved in installation process as possible
The setup for my central heating:
- WB Greenstar 15i condensing boiler (Greenstar 15i System - Worcester, Bosch Group UK homeowner site)
- WB FW100 weather compensating controller (FW100 Weather compensation controller - Worcester, Bosch Group UK homeowner site)
Heating is delivered mainly by underfloor heating and 3 rads in bedrooms (house is brand new, well insulated and quite small - 1100 sq feet) I've set "heating" interval temperature to 20 degrees and "saving" interval temperature to 17 degrees. Outside temp. recently is something around +3 degrees daily average. Max flow temperature is set to 60 degrees.
My concern is that the boiler is approaching the set temperature but never reaching it and burner is constantly on (while on "heating" interval of daily programme). I understand that burner can only modulate down to 35 degrees flow temp. And while it's still quite warm outside, demanded flow temperature is shown only 27-30 degrees (by controller). Boiler sticks to that temp (displayed on boiler showing actual flow temperature). It seems to me that boiler is wasting gas, trying to stay on all the time by any means, because it simply can't modulate less than 35 degrees (it even turns off the pump sometimes, but burner is still on). Shouldn't it just reach designated room temp and turn off, wait till it drops, say 1 degree, and then turn on again? Room temp is staying 0,5 degrees lower than set temp (if set at 20, boiler keeps it at 19-19,5, constantly burning gas and not reaching 20 seemingly on purpose). When programme switches to "saving" interval, it turns off and cools down (though usually room temp drops only 1-2 degrees during this interval until next heating phase comes, so boiler stays off for several hours). So I "solve" this problem by adding shorter heating intervals in the programme, but it seems to me as dumb work-around for a decently smart system. It's kinda annoying that boiler works that way, because having a decently insulated house i'd like to see boiler heating up rooms to, say 21 degrees, and turning off untill it cools down to 19,5 (it would take at least 1-2 hours, not just a few minutes) so average of 20 degrees is maintained during "heating" phase. Gas usage isn't big, but if it can be smaller - i don't mind
Is something wrong with my setup and/or controller settings or that's how this boiler is supposed to operate, is this more energy efficient or something?
Explanations and advices will be much appreciated!
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