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Old 01-30-2020, 11:11 AM   #46
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Re: Can't purge all air out of boiler zone


When the gauge on my boiler quit, I added a new on in the connection between the bladder and the air scoop. I simply added a T in there and screwed a 60# gauge in there. Mine is marked off in 2# increments so I can see that it is running ~13# system pressure.

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Old 01-30-2020, 12:18 PM   #47
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Re: Can't purge all air out of boiler zone


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Originally Posted by beenthere View Post
Unless when you isolated the tank from the system. You also removed it from the system, or had a valve that was open and exposed the ladder to atmospheric pressure, you got a false reading.


How old is the tank, may be time to replace it.

This is the second winter on this tank. How I was previously told to check the pressure on the expansion tank was to shut off the valve at the auto fill, right below it and then each valve at the control valves. Drain the water in that section and check the pressure on the tank with the drain valve still open. Did I get bad info?
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Old 01-30-2020, 02:34 PM   #48
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Re: Can't purge all air out of boiler zone


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Originally Posted by pistilloyd View Post
This is the second winter on this tank. How I was previously told to check the pressure on the expansion tank was to shut off the valve at the auto fill, right below it and then each valve at the control valves. Drain the water in that section and check the pressure on the tank with the drain valve still open. Did I get bad info?

No, on your system, that would be correct.


I would bring the tank up to at least 12 PSIG air pressure.
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Old 02-10-2020, 04:11 PM   #49
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Re: Can't purge all air out of boiler zone


I replaced the pressure relief valve yesterday since it was pretty old and it seems like I am having pressure issues. After purging once the valve was replaced, the rushing water has gone away entirely in the past 24hrs. The boiler gauge, which I have been told is broken, registers at about 40psi when the system is running. However, the new relief isn't opening at all. I turned the system off and while it was still hot, tested the pressure with two independent gauges which both showed 20psi, which they weren't registering anything previously when all the noise was happening.

1. Am I right to assume that my pressure was way too low, hence the rushing water, and that my boiler's gauge is indeed busted?
2. Is it worth replacing the auto fill incase there is an issue there?
3. How about the expansion tank? Should I replace it even though it is just 2 years old and the pressure is reading the same from when I recently added pressure into it?

As always, thanks for the feedback!
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Old 02-10-2020, 07:42 PM   #50
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Re: Can't purge all air out of boiler zone


If your going to run your system at 20 PSIG, then you should put that much air pressure the tank.


Yes, all the noise was probably the lack of pressure in your system.


If you have been leaving the auto fill, fill the system, and it never got the pressure up. It already has developed a problem.
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Old 02-10-2020, 08:24 PM   #51
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Re: Can't purge all air out of boiler zone


May I be blunt?
This has been going on for 4 months now. You have been given a wealth of information, suggestions and ideas as to what to do. Nothing has worked.
It's time you hire someone who actually knows what they are doing regarding boiler systems.
The consensus is that you have a leak. You have admitted that the pressure goes down overnight with everything turned off.
That's a leak.
You keep trying different things and that's not a bad means of trying to find the issue. But nothing has worked. The heating season will be over soon and you still won't have this fixed.
I have suggested that you have a problem with the installation itself. But since you say it started 4 months ago then that is quite unlikely.
Something happened. If that tech who came out 4 months ago started this then at least you have a place to look. There are only so many things that can go wrong with the system. You may have a leak you can't see. A pressurized system will maintain that pressure. Yes, it can change with boiler operating temperature, but that pressure change won't change the water in the pipe or radiators if all is working well.
Maybe it's time to admit defeat.
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