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Fast fill setting off over pressure valve
Hey everyone, I had some work done on our boiler a few weeks ago and was hoping they would purge the system…but they didn’t and now there’s air and now we hear water flowing through the baseboards. So I went to purge the system, and when I used the fast fill it ended up setting off my overpressure relief valve. Now, I had done this in the spring, purged the system, because I replaced a valve and got air into the system, absolutely no issue with the pressure valve going off with the use of fast fill with ~55 psi of city water. Since then, apparently the over pressure valve started leaking ( 20 years old) and we had the technician replace it a few weeks ago along with installing a couple other shut offs and some other work.
I initially thought maybe because the boiler was still hot it was quickly heating the new water so it would build pressure/steam, but even when the water flowing through was completely cooled, below 70f, it was still building to over 30 psi within about a minute. This all being said because I can’t really get enough pressure going to push out all the air, I’m kind of worried some of the stuff he installed could maybe be letting air into the system, but I don’t see any leaks anywhere. Also hard to tell if my stupid automatic air bleeder is even working, I can’t say I’ve heard any wisps of air come out of it while purging, definitely seems old though.
Sorry for the long post, but if anyone has any advice I’d really appreciate it! Thank you!
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