Discuss Boiler Short Cycling in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net
No, But I will take some measurements later. Thanks.When you ran with rads+UFH1 can you remember the boiler flow/return temps and the (pump) flowrate?.
Not really, otherthan it works much better with d0 set at 21. Although concious that this is not enough power when everything is on and when it is cold.Don't know if you made any progress but something strange (again).
If/when the rads only are on at 9.4kw then the dT should be ~ 7.4C at a flowrate of 1.1m3/hr so wonder if boiler sensors are OK even though you seem to prove that that they are/.
Did not time it, maybe 20-30 minsNot really, otherthan it works much better with d0 set at 21. Although concious that this is not enough power when everything is on and when it is cold.
Just tried now from cold (was at 28 degrees)
Boiler headed up to 70 and settled at
flow - 70
return 57
3.47 head
1.18 flow
I put temp probes on the flow and return into the boiler and the readings pretty much (<5 degrees) matched what d40 and d41 were saying.
I have my heating person coming back next week and have e-mailed glow worm who have given me a number for him to call and do some tests. I asked if I could do these tests etc, but was told that need specialist equipment?
Thanks again
Andrew
< 5C might be significant if it resulted in your dT being 8C (13-5), this, assuming flow rate correct results in a heat demand of 11kw not a whole lot away from your rad demand assuming you didn't have the ufh or cylinder calling for heat.Not really, otherthan it works much better with d0 set at 21. Although concious that this is not enough power when everything is on and when it is cold.
Just tried now from cold (was at 28 degrees)
Boiler headed up to 70 and settled at
flow - 70
return 57
3.47 head
1.18 flow
I put temp probes on the flow and return into the boiler and the readings pretty much (<5 degrees) matched what d40 and d41 were saying.
I have my heating person coming back next week and have e-mailed glow worm who have given me a number for him to call and do some tests. I asked if I could do these tests etc, but was told that need specialist equipment?
Thanks again
Andrew
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