Grundfos level switch

zozomikezozomike Posts: 87Solar Expert ✭✭✭
So....12  years ago I put in my Grundfos sqflex11 from our host.( good life on our water so hard we should lay bricks with it)  At the time I bought the level switch, this one, and never installed. Now changing my system, and pulled it off the shelf as I will want a level switch with the new setup. And Darn, cannot figure out the depth to set the thing. Have used an Ohm meter, does not seem to switch till near vertical. Anyone used this as a tank fill and how deep in the tank did you put the switch? 
Grundfos Low-Level Float Switch for CU-200


Off grid,
Array 1 1980w -Flex max 80
Array 2 1590 w- flex max 60
Well array 600w with grundfos sqflex11 to tanks, no battery storage there
GB industurial 510 AH battery 24 V
VFX 3525 inverter,

Comments

  • mike95490mike95490 Posts: 7,613Solar Expert ✭✭✭✭
    Looks a lot like the float switch in my tank.  My switch has a big off-center weight in it, as you tilt it (as if it was floating on surface, or dangling straight down), you can feel and hear a big "clunk" as the element switches.

    My switch is quite near the top of the tank
    Powerfab top of pole PV mount | 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 ,

  • BB.BB. Posts: 27,354Super Moderators admin
    You put a clamp to the wire about 1 foot from the float.... As the water level rises, the float rises (with cord end down) and "turns off".

    As water level falls, the float sinks (with cord end up). And switch turns on.

    You may have to have the pivot point below the water level (to get enough motion on the switch to reliable turn on/off).
    httpwwwthepumpwarehousecomimagesproductsSJEPumpmaster_1000PXjpg
    Make sure that the area where you mount the float does not have a wall, piping, or other stuff that can interfere with the switch--Or the pump will not cycle correctly (as my sump pump failed to turn on and my furnace flooded because the sump was too small for pump+float switch to operate freely)).

    -Bill

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • zozomikezozomike Posts: 87Solar Expert ✭✭✭
    Thanks guys, I guess I will just try it like Bill suggested. 
    Off grid,
    Array 1 1980w -Flex max 80
    Array 2 1590 w- flex max 60
    Well array 600w with grundfos sqflex11 to tanks, no battery storage there
    GB industurial 510 AH battery 24 V
    VFX 3525 inverter,
Sign In or Register to comment.