Back boiler system with pump on central heating and gravity hot water. I have discovered that the pump is switched off by the room thermostat but the boiler continues to fire for up to a minute afterwards. The boiler will continue to fire up/go out until the pump is again switched on by the room thermostat. My gut instinct is that this is wrong but I'd like to check before I call someone out to look at it. Thanks.
Central heating question
- Thread starter flemsbog
- Start date
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S
Soggy_weetabix
GRAVITY hot water.
Why would you pump run on h/w demand?
Your pump will run ONLY on c/h demand, and whilst your heating is operating your h/w will circulate by gravity.
If you select h/w your boiler will cycle continually whilst its on demand.
David
Why would you pump run on h/w demand?
Your pump will run ONLY on c/h demand, and whilst your heating is operating your h/w will circulate by gravity.
If you select h/w your boiler will cycle continually whilst its on demand.
David
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Hang on...Am I writing in chinese or someting???? I never said that I expected the pump to run with a hot water demand. I have assumed, rightly or wrongly that while there is a demand for CENTRAL HEATING that the pump should be running all the time, to circulate the heated water and as I've read elsewhere dissipate heat from the boiler. I have assumed, again rightly or wrongly that when the room thermostat is satisfied that the burner on the boiler should turn off and not the pump. If I am wrong and this is the correct operation of this type of system then all well and good but if there is a problem with the system operating in this way then I would like to get it sorted out. Apologies if this sounds a bit tetchy, the wife is out and I'm having to look after the kids. I need a drink now.
flemsbog said:
You're thinking of pump overrun on a timer or on a temperature sensor. Your old BBU system doesn't have either of these things.
You're quite right in that the room stat starts the pump and it only does this when there is a demand for heat. The timer still on heating but temperature being satisfied does not equal a demand for heat - hence the pump stops.
As was said before, the boiler starting and stopping is due to hot water demand only.
What a load of tripe - you've just jumped on the bandwagon full of people having a go at someone who doesn't deserve it.CorgiIOW said:Some people,,,,,,,, i ask you !
Typical individual, wont pay the money to get a competent person in, then moans that the FREE info he / she gets from the internet "Good info" i might add, is not what he wanted !!!!!!!!!
The OP has done nothing wrong other than react emotionally to one post that, frankly, didn't address his question. And a sentence or so later he apologised for his own tetchiness. AND, he later expressed thanks for the help that he'd receieved.
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