[RE-wrenches] Grundfos SQFlex

[Ron Young]

Awesome responses thank you! And yes I did mix up the IO-101 operating voltage with the CU200. 

So because efficiency is important we’ll keep the CU200 in the system. 

Client wants a large pressure tank because of garden irrigation so we're looking at an 86 gallon model so pump will not cycle as frequently and pump efficiency will optimize with longer running times. Aside from bulk and weight problems of the tank I don’t foresee any other issues. Appreciate comments if otherwise.

Ron Young

On Oct 20, 2014, at 7:55 PM, toddcory at finestplanet.com wrote:

> "If you are not going to be using a PV-direct arrangement, there is  not much advantage in using the Flex pumps."
>  
> 
> except efficiency. i have two wells at home and the grundfos sqflex pumps 50' of additional head at the same flow rate, using 30% less energy as compared to the standard, 3/4 hp pump down the other hole..
>  
> and yes, the cu200's label says up to 240 vac is fine.
> as long as he has it, why not run the power through it?
>  
> todd
>  
>  
> 
> 
> On Monday, October 20, 2014 7:24pm, "Brian Teitelbaum" <bteitelbaum at aeesolar.com> said:
> 
> > Hi Ron,
> > 
> > What you describe with using a pressure switch and pressure tank, and just
> > running the pump with 240 VAC, is fine. You don't need the CU-200 to do
> > any of that, if all you are doing is switching AC. The diagnostics is
> > nice, but probably not worth the cost in this kind of simple setup.
> > 
> > One issue though. The SQFlex pumps are not exactly instant-on. There is a
> > slight delay between when power is applied and the pump starts. Just make
> > sure that you use a large enough pressure tank to keep the pressure from
> > dropping too far before the pump starts filling it. You may have to raise
> > the starting pressure on the switch a little above where you set the
> > minimum pressure, to let it fall some at startup.
> > 
> > When it becomes time to replace the pump (hopefully many years from now),
> > I would just go with a Grundfos SQ straight AC pump instead of the Flex
> > model. If you are not going to be using a PV-direct arrangement, there is
> > not much advantage in using the Flex pumps.
> > 
> > Brian Teitelbaum
> > AEE solar
> >
> 
> 
> 
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