I have recently had my central heating/HW system upgraded.
I have a Baxi Megaflow system HE boiler 2 x 2 port drayton ZA5 valves, plus a Boiler Buddy on the return to catch any bits in the old pipe system. Boiler and valves are located in the loft.
HW cylinder were also replaced along with pipework to HW cylinder. All CH pipes are from old installation apart from new linkage pipes from boiler in loft to old pipes in Garage below.
Also to state the obvious, it is a system boiler so pump, bypass, PRV, vent and expansion vessel are within the boiler enclosure space.
All was well from installation in mid november 2006. In the last month I have noticed a loud noise from the loft when either the heating or water shuts off.
I have tested today and found that the noise occurs just as either valve is closing and this happens even if the alternate valve is still open.
The valves are both close to the boiler (approx 1/2 Metre) on each leg of the feed after it splits for HW/CH
I would deduce from this that the valve is closing quickly and causing the pipe noise, the question is why has this just started to happen and what can be done to resolve it.
I am a fairly proficient DIY plumber, but had a Corgi registered heating engineer fit and commission the system.
I have tried running the system at 1 bar and 2 bar to see if this made any difference, but have not seen any change, although currently pressure is just over 2 bar when running.
Any advice welcome.
I have a Baxi Megaflow system HE boiler 2 x 2 port drayton ZA5 valves, plus a Boiler Buddy on the return to catch any bits in the old pipe system. Boiler and valves are located in the loft.
HW cylinder were also replaced along with pipework to HW cylinder. All CH pipes are from old installation apart from new linkage pipes from boiler in loft to old pipes in Garage below.
Also to state the obvious, it is a system boiler so pump, bypass, PRV, vent and expansion vessel are within the boiler enclosure space.
All was well from installation in mid november 2006. In the last month I have noticed a loud noise from the loft when either the heating or water shuts off.
I have tested today and found that the noise occurs just as either valve is closing and this happens even if the alternate valve is still open.
The valves are both close to the boiler (approx 1/2 Metre) on each leg of the feed after it splits for HW/CH
I would deduce from this that the valve is closing quickly and causing the pipe noise, the question is why has this just started to happen and what can be done to resolve it.
I am a fairly proficient DIY plumber, but had a Corgi registered heating engineer fit and commission the system.
I have tried running the system at 1 bar and 2 bar to see if this made any difference, but have not seen any change, although currently pressure is just over 2 bar when running.
Any advice welcome.