I am having a problem that I hope you can help me out with. I have an open direct system that I think is not getting enough flow with the pumps. The people that I bought it from seem to think that flow is fine, though. The problem is that I left it on for 24 hours on 67 degrees. When I went to the house today one zone on the thermostat was reading 60 and the other 63. The temp outside is 25 degrees Fahrenheit. So I think that when they are both on it does not flow fast enough. It almost seems like there is air in the line or it has some flow restrictions. When I stated it up the well did have a lot of black mud or something in it which I have since fixed. I've taken the pumps off to see if there was anything in them but with no avail. I will post everything that I can to see if I have something wrong. Can you guys look at my design to see if it's right? Are my pumps sized enough? Or anything else? Here's some more info:
I had a company design the system for me...so here are their numbers:
Zone 1, 750 sq ft, 130-150 fluid temp, flow rate 3gpm, medium pump selector, energy factor .05, temp difference 65, 24375 btu heat required
Zone 2 862sqft, 130-150 fluid temp, flow rate 3.75 gpm, medium pump selector, energy factor .05, temp difference 65, 28015 btu heat required
My actual flow is (on the highest setting)zone 1-1.8 gpm, zone 2-1.8gpm, together at the same time 2.2gpm
My delta t is 140 out and 107 in...it is 25 deg Fahrenheit outside.
My pumps are grundfos ups15-35sfc 0-12ft head range, 3 settings
I have two zones, 1/2 pex with my manifolds 23 feet away from the pumps with 3/4 pex-a
My loops are zone 1-250ft, 260,255, 267, and 290. Zone 2 is 260, 275, 260, and 275.
So my actual flow is 2.2 gpm through both zones. Is that enough?
Also, one of the pumps is making a funny noise. I have a video but can't seem to upload it.