35 PSI blow-by valve?

Tharon

Hi, folks,
Just bought a home with a Utica gas fired boiler and FHW baseboard heating. Leaked in a few places, but got those fixed up fine. Problem now is the pressure in the boiler seems to be too high. It tops off at about 35-38 psi (by dial on boiler), and the pressure release valve opens slightly, letting off steam and water. Now, I like a sauna as much as the next guy, but...

I replaced the pressure relief valve, and it's still blowing open. I am getting heat just fine, throughout the system. Bled off the air in the lines, replaced the thermostat in the main room of the house (only one) with an electronic programable.

Any ideas on where else I can look for this problem? I am wondering if the regulator might be the problem, maybe letting too much cold water pressure (60 psi, right?) into the system?

Any help appreciated!

Tim Mueller

lchmb

how about

You could also check your expansion tank to make sure the pressure is proper. Does the unit have a domestic coil? could be leaking. The boiler pressure regulator could also be an issue. How often is it dropping water? When you purged the line's what pressure did you end up with prior to the system coming back to temp?

Jeff Lawrence_24

Your best bet

Is to call someone out to look at your system.

It's kind of hard to diagnosis a system over the internet. There are a few things you can look at, but in most instances, calling someone that does it all the time will be the safest way to go.

You system is probably designed to run at about 12 pounds pressure. The releif is blowing because it's so far aabove that pressure.

Your own website says "Don't waste time, money, or energy on non-productive tasks." The people on Find-a-Prfessional won't waste your money, they'll do the work correctly the first time. Besides, you need to look at the safety of your family and these people do.



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Dale

90% of the time

This symptom is almost always an expansion tank needing draining if the old style or replacement if the new style.