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Author:
HoweDIY (CT)
Hello,
I've been trouble shooting my baseboard heating system but to date unable to get the pressure in the system to reduce.
I have 2 zones which run on a Weil Mcclain CGM-25 boiler.
The pressure guage won't go below 28PSI and anytime the system calls for heat the gauge goes above 30 PSI causing the relief valve to engage.
It started when I was only getting heat to my lower zone.(basement of a raised ranch)
I attempted to bleed the pipes which appears to have solved the zone heating issue.
because I replaced the expansion tank in the spring I didn't consider this to be the issue, (I don't have the tank size available to post at this time.)
and thought the high pressure could be caused by a bad pressure reducing valve, however, I just changed this out and it had no effect on reducing the pressure in the system.
How likely is it that the pressure gauge on this system is bad?
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Author:
hj (AZ)
Even if it were bad, the expansion tank would not open until the pressure exceeded 30 psi. You have a different problem but one that might require a technician at the site to diagnose.
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Author:
Paul48 (CT)
Did you adjust the pressure on the pressure reducing valve? Fifteen psi is more than enough for a raised ranch. You're starting off with a pressure that is way too high. The air you bled off causes problems that you are aware of, but it was acting like a very large expansion tank. Adjust the pressure down to 15 psi, and see how things go. Turn the pressure on the reducing valve way down, then bleed the pressure off the system. The slowly turn the pressure up on the reducing valve until it gets to 15
Edited 1 times.
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Author:
packy (MA)
correcting hj's typo..
I'm sure he meant 'relief valve' rather than 'expansion tank'.
one of my great arguments with boilers is that the pressure gauge is usually a very cheap variety and rarely functions properly after a few years.
you can leave it where it is and check your boiler pressure with a gauge that screws onto any convenient hose faucet.
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