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 fitted a pressure reducing valve to the inlet of the boiler. I closed the mains water, released all the pressure by running a tap. I then closed the the inlet and opened the mains, and set the valve to 1 bar.
As soon as i open the inlet to the boiler the pressure on the reducing valve starts to increase until it reaches 6 bar.
I assumed this is down to back pressure so I added a 8 litre expansion vessel pre-pressurised to 1.6 bar. Here is what i have now:
Mains in (water is metered) ----> pressure reducing valve (set to 1 bar) ----- [Expansion vessel] ------ Boiler inlet.
The same thing still happens though. As soon as i open the inlet to the boiler the pressure gauge on the reducing valve increases to 6 bar. If i run a tap it gradually reduces back down to around 1.7 bar, but when i close the tap up it goes again.
Any ideas what could be going on here?
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 fitted a pressure reducing valve to the inlet of the boiler. I closed the mains water, released all the pressure by running a tap. I then closed the the inlet and opened the mains, and set the valve to 1 bar.
As soon as i open the inlet to the boiler the pressure on the reducing valve starts to increase until it reaches 6 bar.
I assumed this is down to back pressure so I added a 8 litre expansion vessel pre-pressurised to 1.6 bar. Here is what i have now:
Mains in (water is metered) ----> pressure reducing valve (set to 1 bar) ----- [Expansion vessel] ------ Boiler inlet.
The same thing still happens though. As soon as i open the inlet to the boiler the pressure gauge on the reducing valve increases to 6 bar. If i run a tap it gradually reduces back down to around 1.7 bar, but when i close the tap up it goes again.
Any ideas what could be going on here?