Hi Dave,
It’s great that things are continuing to improve. I think we need to give the warmer weather a lot of the credit but as long as things remain stable that’s all good.
Excellent. I’m pretty sure that’s all you need to do with the BT50. It won’t completely get you off the hook from choosing a suitable Curve but effectively it will auto-adjust the Offset based on the indoor temperature.
On my older SMO 20 controller there are some configurable ‘factor’ settings related to this but those aren’t available with your SMO S40 and you basically only get to tick the box (or not).
We’ll need to keep a watch on how S1 (the Calculated Target Flow temperature) reacts based on the BT50 input. NIBE warn that using BT50 to control the heating can be problematic with UFH (especially slow-reacting UFH) and NIBE F2040 12kW with SMO S40 controls not following WC? describes some unexpected behaviour that could happen. (You can always un-tick that box in 1.3.3 and myUplink will continue to report the BT50 value but it will stop using it to control S1.)
That’s good. At some point we should explore the DeltaT settings to see if we can make it automatically run the pump faster, since it’s your only circulation pump, but 50% is much better than 12%. That might also help us understand if BT71 is being used as an input for the DeltaT control.
It will be interesting to see how your system performs during the next cold snap - assuming the house is up to temperature by then.
David