Pressure switch for Grudfos SQF & CU200?

[zzrider]

I'm going to be installing a Grundfos 11SQF-2 with a CU200 controller.

Input power will be 120V from the inverter of an off-grid system.

I want to pump to a conventional domestic pressure tank, with the pump switched on/off by a pressure switch

The CU200 has input terminals to connect a tank level switch, and I'm trying to figure out if I can use these contacts and just connect to a normal 40/60 pressure switch.

Amybody else using an SQF with a pressure switch?

 

[pvgirl]

You don't need the CU200 unless you want it for monitoring. You could wire it like a conventional well pump switched by the pressure switch. With the CU200 you will need your pressure switch to provide at the input:

High water level: Contact is closed.
Low water level: Contact is open.

Which is opposite of the standard way well pump switches are wired.

 

[zzrider]

You don't need the CU200 unless you want it for monitoring. You could wire it like a conventional well pump switched by the pressure switch. With the CU200 you will need your pressure switch to provide at the input:

High water level: Contact is closed.
Low water level: Contact is open.

Which is opposite of the standard way well pump switches are wired.

Thanks, pvgirl! I had seen other discussions about the CU200 not being necessary and I had wondered if it was possible to just wire the SQF directly with a conventional pressure switch.

This begs the question - just how important are the "monitoring functions" of the CU200? I already bought the thing and I hate to think that was for nought. I know Grundfos stuff is supposed to be excellent equipment, but their documentation leaves much to be desired.

 

[v_green57]

"just how important are the "monitoring functions" of the CU200?"

Not important at all. Nothing you can't do with a clamp on AC/DC meter.

Not to mention that the CU200 is waaaaayyyy overpriced...

When I set my SQFLEX back in 2008, I built my own control box using analog meters. All DC direct from panels. See attached. (The mA scales to A with a low value shunt resistor). You can see all kinda useful info with the analog meters that you can't see with digital displays. I have since added a wind-up spa timer so I can dial in a specific amt. of pump time and not overflow my storage tanks. The well is 800 ft. away from them and I am too lazy to cobble together a wireless link and a float switch to do it automatically.

Total cost about $100 +/-.