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Pressuretrol pigtail issue and upgrading Pressuretrols to Vaporstats
Ok guys, got a tricky one for you here -- it involves pigtails or the lack thereof.
We have a stream boiler for a condo that I'm trying to get to run a lower psi.
It's a Peerless boiler is about 4 years old and runs well, it has a multi-stage (mod-u-pak) controller system that uses 4 separate pressuretrols (see image), to regulate gas burner anywhere from 50% to 100% burn rate.
So I have two basic questions:
One, I'm thinking we might try to move to vaporstats; i was thinking i might leave the high cutoff pressuretrol alone, and maybe the main operating range pressuretrol alone, since those can be set to pretty high end of the range (high cuttoff at like 5 psi, and main operating range between 1 and 4 psi for example).
And then use vaportstats to adjust firing between 50-100% when it is in the 1-psi range to try to keep the pressure stable. I suppose replacing the main operating range pressuretrol with a vaporstat that goes up to 5psi wouldnt be a terrible idea either.
Not sure if the pressure gauge should be replaced too - current one goes -30 to 30psi?
So my FIRST question is, any suggestions about the above that i might be overlooking?
Now my SECOND question is trickier, it involves the need for a pigtail.
I *believe* that the top two pressuretrols have stopped working (or working well); i used to be able to adjust the ranges so that they kicked in, and now they seem to either not work at all or work very sporadically -- most of the time acting like they see no pressure at all -- and seeming to kick on only randomly and when tapped hard.
So here is my theory:
I understand the need for pigtails to protect the pressuretrols.. and i think i understand the fact that the Peerless boiler installation manual for general pressuretrol doesn't use a pigtail because the pressuretrol piping has T that dips down and then back up and ACTS LIKE A PIGTAIL. This took me a while to understand but there are posts on the Wall about this.
SO.. my theory is that when all 4 pressuretrols were hooked up in this configuration, what we have is the BOTTOM TWO pressuretrols protected by a water bubble like a pigtail, BUT THE TOP TWO pressuretrols unprotected -- thus explaining the fact that i believe they are failing.
So my question is -- do you think i'm right? are the upper two pressuretrols not protected and so need to be piped differently (either with a pigtail or piped like lower two). What about the pressure gauge? does it need to be on a pigtail or looping Tee?
Apologize for the long post -- hoping some of you experts will be able to make some sense of my questions..