The entire system is about 18 months old. System boiler is Glowworm 24hxi (this controls the pump itself) with a Centaurplus C27 programmer.
Everything works fine apart from getting one loud bang on the pipework on the Port A (radiator circuit connection) when there is demand for HW when the central heating was on last but had switched off before the HW demand i.e. boiler and pump were both off. at the time that there was HW demand.
From browsing a bit here it looks like a Sundial "Y" Plan.
When there is HW demand (or I press the Boost button on the programmer) the boiler and pump start at the same time as the valve changes position and it seems like the water flow is slamming the valve over? Should this happen or should the boiler and then pump start when the valve has finished moving?
I tried switching off the boiler, pressing the Boost button (valve changes position) and then switched the boiler on and there was no banging!
Also if there is HW demand when the CH is on the valve changes position with no nasty bangs.
Any pointers would be most appreciated,
Cheers,
--Rob Singlehurst
Everything works fine apart from getting one loud bang on the pipework on the Port A (radiator circuit connection) when there is demand for HW when the central heating was on last but had switched off before the HW demand i.e. boiler and pump were both off. at the time that there was HW demand.
From browsing a bit here it looks like a Sundial "Y" Plan.
When there is HW demand (or I press the Boost button on the programmer) the boiler and pump start at the same time as the valve changes position and it seems like the water flow is slamming the valve over? Should this happen or should the boiler and then pump start when the valve has finished moving?
I tried switching off the boiler, pressing the Boost button (valve changes position) and then switched the boiler on and there was no banging!
Also if there is HW demand when the CH is on the valve changes position with no nasty bangs.
Any pointers would be most appreciated,
Cheers,
--Rob Singlehurst