I've posted about this last year but thought I'd start a new thread now I have a bit more information.
I have a fully pumped open vent system, combined feed and vent. As you can see from the pic below, the magnaclean is installed (incorrectly I believe, and by BG, but that's another story) on the flow to the HW cylinder.
Fot the past few months I've not had the heating on, just the HW, and there has been no air at all building up in the magnaclean so I can assume my problem is not due to the HW circuit/pipes. I have had the CH on recently so the 3 port valve is of course directing water to both the CH and HW circuits and my problem of air building up in the magnaclean is re-occuring every couple of weeks or less.
I dosed the system with Fernox F1 in October last year. Given that air seems to be building up only when the CH (rather than HW) is involved, does this help diagnose the problem? I find it difficult to tell if the air is air or gas, as I don't want to stick a match to a plastic magnaclean when I'm bleeding the air off! It's not loads of air, but enough to make the magnaclean gurgle, so I know when it needs bleeding.
I have a fully pumped open vent system, combined feed and vent. As you can see from the pic below, the magnaclean is installed (incorrectly I believe, and by BG, but that's another story) on the flow to the HW cylinder.
Fot the past few months I've not had the heating on, just the HW, and there has been no air at all building up in the magnaclean so I can assume my problem is not due to the HW circuit/pipes. I have had the CH on recently so the 3 port valve is of course directing water to both the CH and HW circuits and my problem of air building up in the magnaclean is re-occuring every couple of weeks or less.
I dosed the system with Fernox F1 in October last year. Given that air seems to be building up only when the CH (rather than HW) is involved, does this help diagnose the problem? I find it difficult to tell if the air is air or gas, as I don't want to stick a match to a plastic magnaclean when I'm bleeding the air off! It's not loads of air, but enough to make the magnaclean gurgle, so I know when it needs bleeding.