I have read that an Auto Bypass Valve (ABV) is not compatible with a pump set to Proportional Pressure (PP) mode.
I have a recently fitted Vaillant EcoFit Pure 430 heat-only boiler + Vaillant SensoComfort weather sensing controls + 15 rads (12 with TRVs) across 2 CH zones + a static bypass valve set slightly open (no ABV) + pressure vessel. I find PP mode works well (it reduces CH circulation noise and, I believe, it has improved the Flow/Ret delta due to the pump modulating, enhancing the chances of condensing). However, I am advised to install an ABV which is more efficient than a static bypass valve (maintains minimum flow through the boiler as TRVs close, reduces noise and opens the bypass only when necessary).
I would like to use both (ABV & PP mode), but given an enforced choice, which is the better option to select or are there other options?
Thank you
I have a recently fitted Vaillant EcoFit Pure 430 heat-only boiler + Vaillant SensoComfort weather sensing controls + 15 rads (12 with TRVs) across 2 CH zones + a static bypass valve set slightly open (no ABV) + pressure vessel. I find PP mode works well (it reduces CH circulation noise and, I believe, it has improved the Flow/Ret delta due to the pump modulating, enhancing the chances of condensing). However, I am advised to install an ABV which is more efficient than a static bypass valve (maintains minimum flow through the boiler as TRVs close, reduces noise and opens the bypass only when necessary).
I would like to use both (ABV & PP mode), but given an enforced choice, which is the better option to select or are there other options?
Thank you