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- 9 Mar 2016
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I have UFH downstairs and Rads upstairs. The CH out from the boiler goes through a Y Splitter and I then have a 2-port motorised valve on each CH circuit, one leads to the upstairs CH rads and is all controlled via one thermostat, the other goes downstairs where it meets the UFH manifold, blending valve and an additional pump for all the downstairs UFH, each room has its own room stat and a call for heat from any one of them opens the 2-port motorised valve.
If either the Rads OR the UFH is open, then that circuit is boiling hot, the boiler temp is running at 70°C and fires each time the temp drops as the water circulates and I can't touch the pipes near the boiler. If both are open, neither run hot, the boiler display shows the internal water temperature of around 30°C and the boiler doesn't fire to heat this.
Have you ever come across this before please and do you have any suggestions or recommendations as to what I can do to solve this?
Thank you all very much
If either the Rads OR the UFH is open, then that circuit is boiling hot, the boiler temp is running at 70°C and fires each time the temp drops as the water circulates and I can't touch the pipes near the boiler. If both are open, neither run hot, the boiler display shows the internal water temperature of around 30°C and the boiler doesn't fire to heat this.
Have you ever come across this before please and do you have any suggestions or recommendations as to what I can do to solve this?
Thank you all very much