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Posted by GeneratorGrrl on April 05, 2005 at 14:15:23:
In Reply to: Re: Glycol system air bleeders posted by Tony Conner on April 05, 2005 at 08:22:01:
: If you're pumping TOWARD the expansion tank, you can have a situation in which the air vents can pull air into the system. The expansion tank sets the pressure for the system. The circ pump can't increase the tank pressure, but will still move liquid, because the suction pressure falls. If it drops far enough, you can suck air into your system.
Tony, thank you. You have described the bunker boiler set-up exactly. The circulating pump is on the inlet side of the boiler and the air bleeders and cushion tank are on the outlet side. There are no air separators on the system. I had never seen a circulator pump mounted on the inlet side of the boiler before and it makes no sense to me at all.
My manager is considering adding an atmospheric expansion tank to the system, locating it on the roof (the cushion tank is on the floor in the boiler room about 5 feet from the boiler :-P ) I will suggest to him your layout - if he wants to repipe the system anyways, let's get it right.
You're sure its outlet, expansion tank, separator, pump, and not outlet, separator, tank, pump? Just want to make absolutely sure.
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