When adjusting the flow can anyone confirm its the RED disk shown by the Red line. I guess so but there is that other disk just below it( blue line)

Apologies guys this is an ASHP related question. MODS: can this post be moved please?

49 minutes ago, Post and beam said:

When adjusting the flow can anyone confirm its the RED disk shown by the Red line. I guess so but there is that other disk just below it( blue line)

Not sure what the other disc is , but it's the red one you are looking at at the top of the spring.

 

If you are running without a buffer, and secondary pump, you would just open all the valves fully, only closing in one where rooms get too warm. Then let the heat pump controller do the flow rate it needs. You end up with a variable UFH heat output controlled by heat pump.

Interesting strategy, my design was presented to me with each of the 11 circuits assigned a flow rate.

I do not have a buffer, well i dont think so. I have a RED pressure vessel and a white one in my cylinder cupboard.

All discussions with the installer made it clear i wanted a single zone downstairs for the UFH. WC and as simple as possible.

Thanks for the response by the way.

20 minutes ago, Post and beam said:

RED pressure vessel

That's just an expansion cylinder, used to take up space when the heating is on or off to save bursting pipes. The white one does the same for the cylinder.

 

My previous comments assumed WC and modulating ASHP, ASHP will modulate the ASHP circulation pump flow rate to help manage dT. If actual flow rate is capped by a load of flow meters being part closed, that doesn't work well.

Understood.

I have a 5kw Vaillant arotherm. 

Will give this 'wide open' strategy a trial.