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  • Question about pressure switch

    Hello All,

    My first post. Just installed a Grundfos 6 SQF-2 pump sitting at 350' in well. Connected directly to 48 VDC batteries, I get 4GPM. In the process of hooking up the PV panels into the Grundfos CU200 smart box. The option for pressure switch is the same as the float switch according to Grundfos.

    The pressure switch is a Square D type as described below. My question is, nowhere can I find a wiring diagram of how these two pieces connect. The CU200 smart box is two wire and the Square D pressure switch is 4 wire contacts. Any help would be greatly appreciated.






    "The Square-D pressure switch is “reverse action” switch designed to be used with the Grundfos CU200 switch contacts. The pressure switch wiring is connected to the “float switch” control terminals in the CU200, just like a float switch would be. In that circuit it’s not carrying any of the PV power current. It’s just providing a contact closure to signal the CU200 to turn the pump off and on. It’s not meant to be installed in the PV power current path. The CU200 does that.

    Grundfos does not make their own pressure switch for the SQFlex pumps. The Square-D switch is what they recommend.”

  • #2
    Did they not include instructions with the kit ? Try the dealer you got it from. If I saw it and had a meter, I could figure it out I think.
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

    Comment


    • #3
      The four wires in the SquareD switch could be two identical contact sets for separate circuits or could be one NO contact set and one NC contact set without a common wire between them.
      As Mike said, a meter or the SquareD documentation (online once you have the part number) should tell you which two wires to use.

      Note that when the Grundfos is powered by a DC circuit a standard float or pressure switch in the power path cannot be used because the pressure switch will generally not have a high enough DC rating.
      SunnyBoy 3000 US, 18 BP Solar 175B panels.

      Comment


      • #4
        Originally posted by Mike90250 View Post
        Did they not include instructions with the kit ? Try the dealer you got it from. If I saw it and had a meter, I could figure it out I think.

        Thats been my complaint, No instructions and the dealer I would never use again

        Comment


        • #5
          Originally posted by inetdog View Post
          The four wires in the SquareD switch could be two identical contact sets for separate circuits or could be one NO contact set and one NC contact set without a common wire between them.
          As Mike said, a meter or the SquareD documentation (online once you have the part number) should tell you which two wires to use.

          Note that when the Grundfos is powered by a DC circuit a standard float or pressure switch in the power path cannot be used because the pressure switch will generally not have a high enough DC rating.
          The float switch or in my case the pressure switch is installed to the CU controller. Grundfos website shows both however I cannot find the schematic, guess I'll have to contact Grundfos to see how they are doing the wiring...The dealer said, "oh I've never seen this done before" Are you telling me that I'm the only guy on the planet who is the first to use a SQ D pressure switch with the CU200 controller.

          Any body on this forum use a SQ D pressure switch and the CU 200 controller?

          Comment


          • #6
            Originally posted by liteguy1 View Post
            The float switch or in my case the pressure switch is installed to the CU controller. Grundfos website shows both however I cannot find the schematic, guess I'll have to contact Grundfos to see how they are doing the wiring...The dealer said, "oh I've never seen this done before" Are you telling me that I'm the only guy on the planet who is the first to use a SQ D pressure switch with the CU200 controller.

            Any body on this forum use a SQ D pressure switch and the CU 200 controller?
            Can you give us the model information on the pressure switch?
            SunnyBoy 3000 US, 18 BP Solar 175B panels.

            Comment


            • #7
              Originally posted by inetdog View Post
              Can you give us the model information on the pressure switch?
              I have the SQ D pressure switch at work and will report back.

              I have attached a couple of pictures including this link

              http://www.sunshineworks.com/downloa...-SP-TL-014.pdf

              Page 17 shows the pressure switch, BUT, nowhere can I find an exact wiring schematic.
              Attached Files

              Comment


              • #8
                todays pictures

                After a lengthy email conversation today with the Grundfos folks, I came up with this diagram from them. According to their engineer, The two wire coming out of the CU200 controller is non polarity and same with the SQ D switch relay. The two wires can go on either half of the SQ D being either lugs L1 and T1 or L2 and T2. Interesting that Grundfos wouldn't have this level of detail, but they do now. Hope it is useful for the next setup someone is doing like this. Thank you all.
                Attached Files

                Comment


                • #9
                  I've never used a pressure switch with any solar pump but my understanding is that you just run a wire from the CU box to the pressure switch (only on one side) and then make the circuit back to the control box. When the switch closes it completes the circuit and the pump will come on.

                  I have wired in float switches and they work in the same manner.

                  Originally posted by liteguy1 View Post
                  After a lengthy email conversation today with the Grundfos folks, I came up with this diagram from them. According to their engineer, The two wire coming out of the CU200 controller is non polarity and same with the SQ D switch relay. The two wires can go on either half of the SQ D being either lugs L1 and T1 or L2 and T2. Interesting that Grundfos wouldn't have this level of detail, but they do now. Hope it is useful for the next setup someone is doing like this. Thank you all.

                  Comment


                  • #10
                    Originally posted by liteguy1 View Post
                    After a lengthy email conversation today with the Grundfos folks, I came up with this diagram from them. According to their engineer, The two wire coming out of the CU200 controller is non polarity and same with the SQ D switch relay. The two wires can go on either half of the SQ D being either lugs L1 and T1 or L2 and T2. Interesting that Grundfos wouldn't have this level of detail, but they do now. Hope it is useful for the next setup someone is doing like this. Thank you all.
                    The key thing shown in the diagram is that the contact [B]closure [/B](whether float or pressure switch) will [B]stop[/B] the pump. This is not the way that typical pressure switches are wired. (Hence the designation of "reverse action" for the pressure switch.)
                    SunnyBoy 3000 US, 18 BP Solar 175B panels.

                    Comment


                    • #11
                      Thanks All

                      Comment


                      • #12
                        im looking for the same thing

                        have you found it yet
                        Originally posted by liteguy1 View Post
                        I have the SQ D pressure switch at work and will report back.

                        I have attached a couple of pictures including this link

                        http://www.sunshineworks.com/downloa...-SP-TL-014.pdf

                        Page 17 shows the pressure switch, BUT, nowhere can I find an exact wiring schematic.

                        Comment


                        • #13
                          Originally posted by herbiehunter View Post
                          have you found it yet
                          Spoke with the Grundfos Engineer and he recommended a "reverse action" Square D pressure switch.

                          There are four terminals and starting from the left hand side I number them 1,2,3,4. From Grundfos:

                          1 & 2 is Normally Closed (NC) – Meaning the circuit is closed when the pump is running (opening the circuit will stop the pump and vice versa)
                          3 & 4 is Normally Open (NO) – Meaning the Circuit is open when the pump is running (Closing the circuit will stop the pump and vice versa.

                          Originally I had this wired with terminals 1&2 which intermittently when triggered off would not shut the pump off.
                          Grundfos had me change the wires to terminals 3&4 and since then I have had no issues with switching.

                          My well runs off of 48 volts presently but would like to run the system on 96 volts however I have been unable to find a 96volt charge controller.
                          Attached Files

                          Comment

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