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Yeah but I think I was using the wrong term... not a sump pump but a submersible pump, the one I use to drain my hot tub. It'll make about 12 PSI which seems to be enough to get me started. I can see why you'd want to do an initial flush with domestic water supply but in my case, my well water...

I started it at 12 PSI. Yeah, it seems to hold that at room temp just fine. I've never had any indication of a leak, drip or anything in all the pressure tests I've done. That's what's so confusing about where the air is coming from.

I put 12PSI in the expansion tank. I completely re-purged the system after adding the new expansion tank using a submersible pump, a bucket and two hoses. Got all the air out and it was perfect until it got up to operating temp them blam-o, a bunch of air from somewhere. MAYBE some trapped air...

Should it be able to hold a vacuum? Wouldn't that just cause the relief valves to open?

Update here - some guys on heatinghelp.com have been giving me some suggestions. I’ve switched out my 1 gallon expansion tank for a brand new 4.4 gallon Amtrol EX-30. I re-purged my system and fired it up. Good news is, the issue where the pressure would rise uncontrollably seems to be resolved...

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Hi all, I've got a new radiant system in new construction that I'm having a heck of a time with air in the system. I've been reading tons of info from posts on here and HeatingHelp.com trying to figure out what's going on. I got the kit from a company who has been great but I'm always up for...