I cant work out where the screed would have gone. Did it just fill from the insulation to the tops of the joists? Then the 18mm chipboard spanned over the joists?
With my system the boiler was sending water through the internal bypass valve rather than the UFH manifold. This made the boilers loop get up to temp very quickly. It then went into an anti-cycle mode for 5 minutes and in that time the UFH had sucked all the heat from the boiler and didn't heat the pipes properly.
How long does it take between 45 degrees being at the flow until 45 degrees appears at the return?
https://www.theunderfloorheatingsto...eating-for-between-joists-or-suspended-floors
With my system the boiler was sending water through the internal bypass valve rather than the UFH manifold. This made the boilers loop get up to temp very quickly. It then went into an anti-cycle mode for 5 minutes and in that time the UFH had sucked all the heat from the boiler and didn't heat the pipes properly.
How long does it take between 45 degrees being at the flow until 45 degrees appears at the return?
https://www.theunderfloorheatingsto...eating-for-between-joists-or-suspended-floors
@Nozzle the flow for both loops is set to maximum, the installer appears to have capped the temperature blender as it only turns to 4.5/6 which translates to about 48degrees on the flow. I've been requesting 21degrees on the room thermostat for days but it has never managed more than 19degrees in the room. The link you sent shows a higher temperature of 55-60 for timber! Over the screed we have 18mm chipboard, plywood (not sure of thickness) and then the karndean vinyl so I don't know if it should be in this higher range due to all the wood.
The red valve is only a quarter turn valve, I'm at a bit of a loss when it comes to reasons for a bypass / throttling etc.
@SpecialK our boiler is a newly installed Worcester Greenstar24ri, I've not looked at how it's behaving when the UFH calls for heat or what a cycling issue is I'm afraid. As mentioned above the screed is cement/sand I believe, then 18mm chipboard, the karndean installer laid ply and vinyl on top. From what I've seen the return temp and flow temp almost always read within a degree of each other which concerns me. I have tried reducing the flow rate to see if that changed anything but it didn't help. How would you normally increase heat drawn from the pipes?