How often have had to top it iup?
Never.
I bleed the air. That’s it.
Discuss Gurgling and air in central heating in the Central Heating Forum area at PlumbersForums.net
How often have had to top it iup?
So after bleeding the air off each time the pressure returns to normal ?. I know it doesn't add up but could/can you remove the filling loop to absolutely rule it out.
There should be a flexible hose somewhere where it connects to the boiler return with isolating valves or can you post a photo of the isolation valve you described previously?
Do mean by PG fluctuations that it changes fairly rapidly while watching it and have you watched it for any unusual behaviour while using hot water?
Will see if there are isolating valves behind.
The pressure only drops/rises when the pump goes on/off. Not during heating.
Haven’t checked when using hot water but will check tomorrow.
@johntheo while I was looking I noticed this.
Also some of the copper pipes into the boiler have this.
Anything to worry about?
Ok, I’ll try this tomorrow along with the hydrogen check!That is the filling loop with a non return valve where shown and a isolating valve where shown on the other end, ensure the isolation valve is closed "across (at right angles to) the pipe" then just slacken the flexible hose where attached to the NR valve but do not remove it, when slackened a few turns water should only dribble out for a few seconds and then stop.
There may be another isolation valve on top of the NR valve but I don't think so, if there is, shut it as well
No, I think it highly unlikely because even if the flexible hose is perished/holed then with a sealed system the pressure should still keep the NR valve shut. I also find it difficult to imagine that you are pulling in air anywhere in the volumes that you are getting especially if the boiler pressure is normally 1bar or higher. Lets hope in one way that its hydrogen!.
Yes, definitely remove (after first slackening) that filling loop, it's only hand tightened at the connection to the NRV, obviously ensure that the isolaton valve is shut, as it appears to be, then post back.
Correct, but let us know when you do disconnect it if there is any dribble of water from it just now.
Now remove it completely and if its still dribbling from the hose then that's your problem.
Ok, will do.I would't have thought as difficult to see how this would pull in air so as one would expect the pressure to slowly decay with time, just leave the hose disconnected and see what happens to the pressure.
I would't have thought so as difficult to see how this would pull in air so as one would expect the pressure to slowly decay with time, just leave the hose disconnected and see what happens to the pressure.
Ok. Pressure drops slightly when hot water comes on.The expansion vessel is normally teed into the pump suction so will rise by the generated pump head when it starts so if connected to the pump discharge will fall but when when off should return to the original pressure if water temp doesn't change,
Can you bring on the hot water very briefly say for 10 secs and then switch off and see if pressure returns to its original.
Was the new E.vessel installed internally in the boiler or is it external where you can see it!.
In the attachment is that a PRV on the filling system??.
It's also possible I suppose but very unlikely as I said above that the pump is pulling in a tiny amount of air through that leaking NRV each time it starts especially if the E.vessel is on the discharge side of the pump, the closer to the boiler the greater the chance, if the boiler is under warranty then that should be covered? its the only part that has direct communication to the atmosphere via the leak even though pressurized.
This is where the leak is (see attached).In the attachment is that a PRV on the filling system??.
It's also possible I suppose but very unlikely as I said above that the pump is pulling in a tiny amount of air through that leaking NRV each time it starts especially if the E.vessel is on the discharge side of the pump, the closer to the boiler the greater the chance, if the boiler is under warranty then that should be covered? its the only part that has direct communication to the atmosphere via the leak even though pressurized.
I seem to remember from a couple years back a Baxi engineer saying that this filling loop is old and should have been replaced when the boiler was replaced. Maybe I’m misremembering, though.Yes, I would replace it as every other possibility seems to have been reasonably exhausted. Maybe its under warranty?.
The valve thats leaking is a non return valve (NRV). the PRV I'm referring to is a pressure reducing valve called a PRV (as is the safety valve also called a PRV, a bit confusing) the pressure reducing valve above is/should be connected dirrectly to the filling hose?.
Forget my reference to that PRV, thats the isolating valve for the filling hose.
As a temporary measure you could attach another filling hose which has isolating valves at both ends, connect one end to the NRV and shut it.
As a temporary measure you could attach another filling hose which has isolating valves at both ends, connect one end to the NRV and shut it.
As a temporary measure you could attach another filling hose which has isolating valves at both ends, connect one end to the NRV and shut it.
Reply to Gurgling and air in central heating in the Central Heating Forum area at PlumbersForums.net
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