Flow too slow ?
Comments
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It is absolutely not the circulator or the mixing valve, if they are in proper operating condition. I suggested that you check the flowmeters while purging with the external purge pump so that we can narrow it down, and never got any feedback on that test.
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I did do that just to see what the valve looks like. It's brand new never been used even though it's 12 years old
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I'm ridiculously ignorant, but doesn't the manifold allow you to turn off any of the loops so that you could enable one at a time to see what the flow is in each one individually?
NJ Steam Homeowner.
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I did that today, no real change except when I ran both pumps together and closed three loops. Then I got 0.8 GPH on one loop only. I repeated that with the other three loops.
When all four loops were open the water was flowing like a garden hose but the gauges were still at 1/4 GPM
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Yes, I did that..
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Maybe I'll get a flow gauge or new manifold gauges.
Because of a system that's not working correctly it sure seems to be working good.
Yes I want to solve this mystery.
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You want about 0.5 GPM on each loop. Assuming 200' for each loop that should be about 1PSI pressure drop. You are showing 3PSI, so that is where the issue is.
Either your loop pipes are kinky or there is an issue with the flow control valves on the manifold.
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it is fairly easy to disassemble the mix valve for inspection. I have pulled the cartridge out of valves and run them, just to eliminate that variable.
Take the plastic knob off, see a large brass nut, maybe square. Unscrew carefully as it will have some spring tension.
Lay the parts out as you disassemble. Spring, plastic retention rings, spool, spring, and copper capsule at the very bottom. Put the top cap back on and run the system.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
where are you getting that 3 psi number from ? The 18 psi on the supply side?
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Yes. 15PSI on the return so 3PSI delta across the manifold. Higher than I would expect.
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The loops should be fine , Im looking into new valve's
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I assumed the higher pressure was from the pump being right there, so that is not the case..
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Or I could swap it out with my other one …then take it apart if needed
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Or take the mixing valve apart and look in there.
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Two bran new mixing valves, no difference, I can put 1.8 GPM or whatever the bottom of the scale is through each loop using both pumps , one of them is cheap Amazon
Water is flowing through the HX just fine.
And while I was working up a sweat doing this the basement hit 70*
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One question,
have you pulled the red protective caps off the flow meters????? Removing them allows you adjust the flow rate by turning them counterclockwise to increase the flow rate.
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In the picture of the supply manifold from the side, the first three red collars (below the flow gauges) are in a different position than the last one (closest to camera). Whaddup?
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Yes, removed them to inspect as well
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Photo taken during construction..
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I guess I am at the point where I have to ask if the circulators are pushing against each other rather than pushing the water the same direction.
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Only one pump, I was using two when purging the system.
This pump has to draw water through a heat exchanger, then lift it almost four feet , then pull it through a mixing valve , then lift it another foot.
Then it enters the manifold and gets pushed through 1000 feet of pex , then leaves the floor and has to rise vertical another four feet.
Then make its way back to the heat exchanger to start over again.
The 007 has max head of 8.5 feet..0 -
The pump head in a closed recirculating system is friction head only; there is no "lifting" because the water comes right back on the other side of the pump, assisted by gravity.
—
Bburd
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I See so the HX the Mix valve and 90* elbows would be the big items in my system?
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What job is the upper circulator doing in this mess???
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Excuse me…
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It's a long shot, but we have seen those air separators plug solid with crud. It separates in the middle, there is an O-ring seal there, to check the mesh inside.
Everything in the loop is what the pump "sees" Them HX, valves, strainers, air sep, mixing valve, manifold, loops, etc
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Thanks Hot Rod, I just realized my last post did not post.
So to clear things up, there is no restriction in this system. Not even the mixing valve is noticeable.
I can stick a sprinkler on the end of the line and water my lawn with it.
So that leaves one thing untested, and Im going to test that this weekend.
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