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Pumping away from the Compression Tank, on a Primary-Secondary heat system
bloombrewing
Member Posts: 5
Most all the pictures I see of a Primary-Secondary system, with close-spaced tees, always seem to show pumping towards the expansion tank, not away. Dan Holohan has a book on "Pumping Away" but all I see is towards.
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Comments
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I can't speak for anyone else, but I would have connected the x-tank to the bottom of the air eliminator.
Also, are those swing check valves on the suction side of the pumps? On the vertical?8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
This is a picture from www.radiantcompany.com, not my job
It does appear that they are single-swing checks before the pumps on the vertical
I agree with putting the tank on the bottom of the air separator, but I often see similar setups like this picture, and wonder????0 -
@bloombrewing you should always pump away from the expansion tank if at all possible. With primary secondary the expansion tank should be on the common piping not the boiler loop1
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It's worth remembering that not all photos are the best way to do things. Also that there are a number of ways to do things which work -- just some work better than others.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Is that a tankless water heater? Usually with high pressure drop appliances you want to pump into it
judging by the Y strainer you are pumping out of the heater?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Why so many drains? The Pumping Away schematic only has one at the boiler outlet.0
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Yes, there seems to be unneeded drains, or purge ports. The 2 at the heater would be to service the heat exchanger when cleaning. The 1 on the "drop" at the Return manifold would be to purge the two zones of any air. The 2 that are before and after the air-seperater and the one near the pumps, I have no idea why they are there and really not needed. Not my set-up, just a picture taken from a Heating supply web site.0
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