Hi,
Changed the fill loop and associated leaky valves on the above boiler. Drained boiler and refilled. Checked expansion vessel pressure at 1 bar when system full but at zero pressure. Re-pressurized to 0.75 bar and checked. System run in CH mode for 1 hour and worked fine. HW fine also.
Switched boiler off today to see what cold system pressure went to and found it had dropped to zero after a few hours. No apparent leak through over-pressure or air-vent valves. Re-pressurized and everything okay again.
I'm a little stumped as to what is happening here. Pressure when hot is around 1.5 bar - not sure what this should be.
Please advise, Pete
Changed the fill loop and associated leaky valves on the above boiler. Drained boiler and refilled. Checked expansion vessel pressure at 1 bar when system full but at zero pressure. Re-pressurized to 0.75 bar and checked. System run in CH mode for 1 hour and worked fine. HW fine also.
Switched boiler off today to see what cold system pressure went to and found it had dropped to zero after a few hours. No apparent leak through over-pressure or air-vent valves. Re-pressurized and everything okay again.
I'm a little stumped as to what is happening here. Pressure when hot is around 1.5 bar - not sure what this should be.
Please advise, Pete