Jay, Grid tie 240VAC Tanks > 100ft to house with some switches on the float switch wiring > 500ft to pump house with control switches and one CU200 and AC power supply > 20ft to one well with pump that is 260ft down > 300ft from pump house to the other CU200 > 300ft to the second pump that is 25ft down. This is the pump we prefer to use and that failed. I'll have to think about control methods. I could conceivably use a relay in the pump house and simply turn an AC pump on and off. The control wirings for the two pumps would have to be completely isolated from each other.
Any recommendations for an AC pump? 250ft head, 600ft of #12 wire at 240VAC, minimal flow needed. The SQF has ~2 gpm, which is plenty. 500gal storage tank with gravity feed to the house. Thanks, Brad On Mon, May 27, 2024 at 11:39 AM jay <jay.pe...@gmail.com> wrote: > HI Brad, > > Is this off/on grid? > And are the two wells near each other or they just join up at the tank and > float switch? > > If you’ve got the power then I’d install just a standard AC centrifugal > pump. Sure uses more power but lasts forever. And is maybe $500 vs $2500 > And you’ve said minimal water use. > > since you switch back and forth you could use a DPDT relay to use the > reverse logic float which the CU200 requires. > > > > > On May 27, 2024, at 12:23 PM, Bradley Bassett via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > > OK, all of the fittings were just fine. After pulling the pump it was > obvious that there was a total failure of the Grundfos SQFlex 3SQF-2 pump > head, both the rotor and the check valve. Water just pours through it in > reverse with no pressure. On the last test in place it would not produce > more than 75psi running on 240VAC deadheaded. This pump is only 10 years > old and only served a two person household with minimal water use on AC > power, so it did not run anywhere near as many hours as a solar pump. > 100psi head. I'd buy a different pump if I could come up with a method of > control. Float switch is 1200 ft away (half AWG#16 and half AWG#14) and a > second SQFlex pump in the other well so I'd have to figure out how to > control both pumps. I do switch from one to the other; they do not run at > the same time. Remember that these float switches are reverse, close on > high water. > > > > Back when I sold these, the pump head was not available separate from > the motor, anyone know if that is still true? > > Anyone have a good source for these? I'll look of course, but first hand > knowledge from anyone here is good. > > > > I do also have a backward leaky check valve in the pump house which will > be a lot of work to replace. I have a problem with cheap unions leaking > also, but they do come in handy in cases like this. I might just cut > through one of the pipes and put in a union. Otherwise I have to > disassemble a lot of plumbing. > > > > Living in the country... > > > > Thanks, > > Brad Bassett > > > >
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