I will do. Think new rads will do world of good though
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Valiant anti cycling function
- Thread starter Diana1990
- Start date
Sooo had heating on tonight. Couldn't figure out difference because when I went into settings d40 and d41 and selected nothing happens. Think it won't allow me to see while boiler is on and I have heating on.
I remember seeing the power outage at 18kwh before. With 7 rads in flat and all single, would it be worth bringing it down a notch? Since turning the CH flow temp if that's what it's called up to 65c, the anti cycling function has happened more often. I counted 3 times and it's just entered its 4th one. Rads are boiling hot... No heat loss at all, temp in flat doesn't drop, so no issues really. Rads don't cool down at all during the cycle because obviously the cycle is only in function for few mins. With that in mind, is it worth changing down to say 16kwh or leave it alone? Don't want to fiddle with things too much, I'm slightly in know but as it gets technical my knowledge dwindles.
I remember seeing the power outage at 18kwh before. With 7 rads in flat and all single, would it be worth bringing it down a notch? Since turning the CH flow temp if that's what it's called up to 65c, the anti cycling function has happened more often. I counted 3 times and it's just entered its 4th one. Rads are boiling hot... No heat loss at all, temp in flat doesn't drop, so no issues really. Rads don't cool down at all during the cycle because obviously the cycle is only in function for few mins. With that in mind, is it worth changing down to say 16kwh or leave it alone? Don't want to fiddle with things too much, I'm slightly in know but as it gets technical my knowledge dwindles.
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Crap, I did it wrong. I didn't select 17 first to get into the settings. My bad lol
When I just tried it now anti cycling function was on. D40 was 57 d41 was 57 too. Shouldn't the numbers be different....
Didn't get d15 because heating went off. Heating went off while in anti cycling mode because at 10.50pm it's set to go off
When I just tried it now anti cycling function was on. D40 was 57 d41 was 57 too. Shouldn't the numbers be different....
Didn't get d15 because heating went off. Heating went off while in anti cycling mode because at 10.50pm it's set to go off
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When it went off at 1050 or every time the roostat(s) (if installed) is satisfied the boiler shuts down but the circ pump keeps running for a period of time set in d.1 "Water Pump Over Run Time", it has nothing to do with the anticycle function and the pump runs on to cool down the boiler heat exchanger. The boiler will only go to anticycle mode, if, when running normally, the heat demand is less than the boiler's minimum output, the flowtemperature will then begin to rise and when it exceeds the target temp by 5C, the burner will trip and the antcycle function d.2 kicks in.
Oh yes, if it was in anti cycling mode and the boiler switched off during this time then it should run for the time as determined in d.1, I'm not sure if its clever enough to stop the pump if the elapsed anticycle time is greater than the set over run time but I wouldn't think so and the pump will then run on for the full pump over run time before stopping.
When the boiler goes into recycle the flow temperature will be SP+5, in your case, 65+5, 70C, but really doesn't matter, as soon as the burner trips and because the pump stays running, the cooler return water will immediately start cooling down the boiler heat exchanger and then displacing the hot water in the radiator top, a typical boiler HEX might only contain say 2.5L and a rad ~ 5L, so the boiler HEX will cool fairly rapidly and because the rad flow might be ~ 1.2LPM then it will take 5/7 minutes for one complete circuit, the rad will still be emitting some heat so you should see the flow and return temps gradually converging, the flowtemp should decrease and the return should/might increase until both are equal, they would gradually recuce to the room temperature if the recycle time was unduly long.
Yes, but only in anticycle and pump overrun, there will allways be a dT when boiler firing normally.
It certainly won't do any harm to reduce to 15kw.
Is the boiler getting away after one recycle, what I mean by this is, after a recycle, does the boiler fire up and remian for at least say 5 minutes?
It certainly won't do any harm to reduce to 15kw.
Is the boiler getting away after one recycle, what I mean by this is, after a recycle, does the boiler fire up and remian for at least say 5 minutes?
It couldnt happen thermodynamically, there will have to be some rise in temperature depending on the boiler output and the flowrate through the boiler, the dT can vary from as little as 4 or 5C right up to 30C After a refire but 10C to 15C woud be more the norm when firing continuously.
Will need to check again when it's not in cycle function
I haven’t read the whole thread but I have a Vaillant 418 EcoTEC boiler (18Kw). Semi detached house, 10 rads. I have mine set at 15Kw with a flow temp of 62° and my pump on the slowest speed. 18Kw in a flat with 7 rads seems too high to me but I’m not a heating engineer so I could be talking out of my backside but my settings work for me. I'd suggest 12Kw for you as a starting point.
Not yet, haven't had heating on since last time when I said. My flat is holding good temp of 19c, sometimes going up to 20c. I don't wanna turn it on for sake of it, I suspect it's working absolutely fine, nothing major that's for sure. But next I have them on I'll report back to you guys
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