Hello!
The aforementioned mid position valve has been replaced on an open vented, Y plan system with 22mm primaries and 8mm feeds to radiators from manifolds (I know). The system is clean and all radiators are new. Heating and DHW are fine, both work as required and provide required heat. However, if CH and DHW are on together, there is a significant 'thunk' from the valve when DHW is satisfied. This did not happen with the previous Honeywell valve (still going strong after 28 years) which was changed out as it seemed like the right thing to do as the system was being upgraded. GSR man fitted a new boiler (GW HSX) and a replacement Grundfos Alpha 2L 15-60 Pump (which, incidentally is not intelligent enough) to replace the 28 year old 15-50 which, was not quite man enough for the 28 year old Glow Worm Fuel Saver when the thermostat was turned right up.......
There is no 'balancing valve' in the DHW circuit, which is completely 22mm pipe.
I am assuming that the clunk is caused by unrestricted flow through the 22mm heating pipes slamming the honeywell ball closed as there is much more resistance in the heating circuit than there is in the DHW.
My question is therefore, is there a simple solution to this problem?
Will a valve swap solve the issue?
Should there be a 'balance' on the dhw circuit?
Many thanks
The aforementioned mid position valve has been replaced on an open vented, Y plan system with 22mm primaries and 8mm feeds to radiators from manifolds (I know). The system is clean and all radiators are new. Heating and DHW are fine, both work as required and provide required heat. However, if CH and DHW are on together, there is a significant 'thunk' from the valve when DHW is satisfied. This did not happen with the previous Honeywell valve (still going strong after 28 years) which was changed out as it seemed like the right thing to do as the system was being upgraded. GSR man fitted a new boiler (GW HSX) and a replacement Grundfos Alpha 2L 15-60 Pump (which, incidentally is not intelligent enough) to replace the 28 year old 15-50 which, was not quite man enough for the 28 year old Glow Worm Fuel Saver when the thermostat was turned right up.......
There is no 'balancing valve' in the DHW circuit, which is completely 22mm pipe.
I am assuming that the clunk is caused by unrestricted flow through the 22mm heating pipes slamming the honeywell ball closed as there is much more resistance in the heating circuit than there is in the DHW.
My question is therefore, is there a simple solution to this problem?
Will a valve swap solve the issue?
Should there be a 'balance' on the dhw circuit?
Many thanks