False Pressure Release Time?

kredmore

I have an average size two pipe home vacuum low pressure system that is well maintained, and have learned quite a bit here and over the years. There is false pressure after the heating cycle has been satisfied. Two questions that I couldn't find info upon searching, as I think I noticed higher than normal false pressure:

1) How long should it take for the False Pressure release to return to zero? Estimated -15 lbs to 0. Meaning, is it being release fast enough, via Hoffman 76? Two Main vents - Hoffman 75s.

2) Is this high (if it's high) false pressure harmful to a system?

Hopefully, this is enough info, but can certainly provide more as needed.

Thanks, Keith

Jamie Hall

I'm not quite sure I know what you mean by "false pressure". Do you mean a vacuum which the system drops into after it has fired? Or that the pressure stays up after the system quits? Or what?

kredmore

negative pressure that the system drops into after heating cycle is satisfied.

Jamie Hall

That's referred to as a vacuum. I suspect that you are referring to 15 inches of water vacuum, not 15 psi -- which would be extraordinary.

The longer it sits there, the better -- that simply means that the system is nice and tight and extracting more from the residual heat in the boiler.

It's a very good thing...

kredmore

ok, thanks. sounds like all is good!