Underfloor heating problem
- Thread starter Baz178
- Start date
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With just turning on any room down stairs with upstairs off, the manifold and pump kick in also the boiler but it never draws warm water through the pipes.
If the D/stairs is circulating water but if there isn't a temperature difference dT between the top manifold where you have a temperature/pressure gauge and the bottom, return manifold then the boiler "cant" run as there is no heat demand, what temperature is this .gauge showing with d/stairs running on its own vs with both running?
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Must go out for a few hours now, back later.
I
It just kicks the boiler in and no heat through the pipes comes no steams coming from the flue when on just down stairs.
It just kicks the boiler in and no heat through the pipes comes no steams coming from the flue when on just down stairs.
Its possible, if unlikely that the flow/return pipes are incorrectly installed in the d/stairs UFH, what is its mixing (TMV) valve set to and with both systems on what is the indicated temperature (on the combined temperature/pressure) gauge and does the return (bottom manifold) feel substantially cooler than the top manifold?.
Yes bottom bar feels a lot cooler than the top one.
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There is really no reason IMO what that D/stairs shouldnt run on its own, assuming a flow/return of 46C/34C, dT 12C, and with a measured manifold of 15.0LPM then the UFH output/boiler demand is, 15*60*12/860, 12.56kw which should be way above the minimum output of any boiler so no cycling etc.
You might just take a set of (same) readings, flow meters, manifold temperature etc off the u/stairs when running both with the D/stairs on and when running on its own.
What boiler have you got, gas/oil? make/model, and if available, its flow and return temperatures.
You might just take a set of (same) readings, flow meters, manifold temperature etc off the u/stairs when running both with the D/stairs on and when running on its own.
What boiler have you got, gas/oil? make/model, and if available, its flow and return temperatures.
You are saying the d/stairs goes completely cold??? when u/stairs shut down. If so take a set of readings off the u/stairs with both on and a set with the d/stairs off, U/stairs on only. I want to see the U/stairs UFH demand when running on its own particularly (and also with both u/stairs & D/stairs on).
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So, just to be clear in my own mind, the U/stairs will run on its own, is that correct?.
If so can you take two sets of readings as requested
I am trying to see if the u/stairs heat demand is the same or more (when running on its own) than the d/stairs
If so can you take two sets of readings as requested
I am trying to see if the u/stairs heat demand is the same or more (when running on its own) than the d/stairs
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