square D Pupmtrol 20/40 Pressure Switch

Discussion in 'Pumps and Tanks Well Forum & Blog' started by daveatthelake, Jun 19, 2006.

  1. daveatthelake

    daveatthelake New Member

    Messages:
    16
    Can someone tell me exactly how to adjust this switch? I have not been able to find a manual online for this product. I have to adjust it due to the idiot who maintaned our camp before we bought it adjusted the heck out of BOTH SCREWS to compensate for the air bladder in the tank that failed. BTW this doesnt solve anything....

    So all said and done we have a new pressure tank and i have the air bladder pressure set to 18 lbs. I am not able to adjust it so i can get 20/40 out of it. I can get the 40 cut out but the 20 is eluding me.......

    I understand that one screw adjusts the range up and down together and the other the spread between the ranges.

    How do I do this?

    Does the little screw adjust the spread? If so by tightening it does the differential increase or decrease? Am I even close? lol
  2. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    The tall spring (assuming you have a Square D Switch) adjusts both on and off pressures. So the first setting you want to achieve is the 20/on pressure with the tall spring. When you have that working, use the short spring to adjust the off pressure of 40 psi.

    bob...
  3. daveatthelake

    daveatthelake New Member

    Messages:
    16
    I do have the square d 20/40 switch.

    so i had it backwards....do you remember how the spread works with the small screw? Lets say my on is adjusted properly to 20psi but it shuts off at 36psi instead of 40, do i tighten or loosen the small screw?

    Your help is much appreciated thank you.
  4. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Turn it clockwise to raise the pressure. The short one will only effect the off pressure.

    bob...
  5. daveatthelake

    daveatthelake New Member

    Messages:
    16
    bob thank you!!
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