Recent content by kam187

Problem solved. 1) The incoming pressure with no flow was about 3.3 bar. However flowing it is ~6 bar. 2) The incoming water main split into two, one pipe going to the rest of the house and the other to the boiler (through PRV), however somewhere under the floor those reconnected before...

Spoke to my plumber who re-installed the boiler after the underfloor went in. All that's changed as i said was the expansion vessel and the PRV. He's baffled.

Right, but the supplier told me to use length * 0.113 to get volume in litres = 113 litres approximately. Also the system was cold with that back pressure issue. So although it's an easy thing to point to as the cause it's not very likely.

No other pipework has changed. I adjusted the PRV to max (pressure) which is minimum (turn) on it to try to take the PRV out of the equation as it was working before i added the PRV. I removed it totally and everything works as normal again :/ I have no idea what is going on here. Any ideas...

Nope it's 100% the right way round. Double triple checked. But I think i may have found the issue. Mains -> pressure reducing valve ---S----> boiler inlet. S is a sink that sits between the mains and the boiler (we're talking 1 meter from mains to S and 2 meters from S to boiler). Hot...

Yeah definitely the right way round. The flow indicator is left to right (left being the water mian in and right being the pipe to the boiler).

Oh and I closed the CH flow and return and repeated the above to isolate that as the source of the pressure (unlikely as it is), but the same happens. With the boiler off where on earth can that pressure be coming from?

Exactly :/ Ok so i have: Mains (3.3 bar with water meter) ----> A ---> Boiler inlet A is a honeywell pressure reducing valve set to 1 bar: http://www.screwfix.com/p/honeywell-15mm-x-pressure-reducing-valve-with-gauge/7978j 1) turn off mains 2) run tap to empty the boiler and inlet pipe -...

Hi, No, i'm not talking about the boiler system pressure. This is all about inlet pressure. There is 3.3bar pressure from the water mains. There is a water meter which means there is a not return valve in that meter at the mains. There will be back pressure from the boiler which is supposed...

I forgot to mention with the boiler off and the system cold the exact same thing happens. I can't understand how there could be a pressure build up of 6 bar when nothing in the system is hot or pressurised to that level. Any ideas?

Hello, I have a Worchester 440cdi combi boiler which regularly dumps water out due to over pressure. - There is 3.3 bar pressure at the property. - There was no pressure reducing valve fitted to the inlet of the boiler. - There was no external expansion vessel on the inlet of the boiler. I...