Pumping Away From What?

Bud_14

Lets say we had no room for an air separator on the supply side of the system, we simply don’t have it (unless, of course) we removed much of that asbestos (and we don’t want to do that)…so we come place the air separator before the pump on the return side (with the bladder tank) we have the auto fill valve piped on the supply side. Would this work?

I guess I’m trying to understand, if we’re thinking about “The point of no pressure change”, Pressure is pressure and the pump would only see an additional two feet of head, the water in the boiler, am I on the right track here?

So when we talk about “pumping away” are we talking about pumping away from the boiler or are we referring to pumping away from “the point of no pressure change”, which would allow me to keep the pump where the darned manufacture put the pump in the first place?

Don’t beat me up too bad please :)

Bud

Mark Eatherton1

Pump away...

from the PONPC. It's acceptable to pump towards the boiler provided that the static fill pressure plus the pumps generated pressure are well below the relief valves threshold. I think many people became confused by Dans recommendation that you pump away from the boiler and the expansion tank, because in most cases, the expansion tank IS connected to the boiler, but NOT ALWAYS. It is more important to pump away from the expansion tank connection.

Now as far as where you put the air elimination/seperation package, ideally, it should be in that part of the system where the pressure is the lowest, the water the hottest, and the velocity the lowest. Technically speaking, on most systems thats three different places!! Now, if the boiler were in the attic, all three places could be combined into one.

Conused enough?

Simply stated, the PONPC is that ONE PLACE that the atmospheric pressure has influence on the hydronic heating system. You MUST pump away from that point if you want your circulator to present itself in a positive pressure manner...

ME

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Bud_14

Thanks Much...I'll enjoy the Packer Game Now..I think, If Bret would learn to throw the ball to "PONP".

have a great day!

bud