New Pressure Switch Problem

Discussion in 'Pumps and Tanks Well Forum & Blog' started by mikeehman, Aug 28, 2008.

  1. mikeehman

    mikeehman New Member

    Messages:
    6
    I have a shallow well pump with a new Square D 40-60 pressure switch. The reason it's new is because the old one would kick in and pump up fine but once it got to the top rather then kick out it would sit at the pressure and the contacts would just rattle back and forth until it either kicked out the breaker or finally get past that point and finally kick out.
    I replaced the switch and the problem has gotten somewhat better but still has a little issue at top pressure. The biggest thing with the new switch is when it hits top pressure it kicks out really hard to the point my lights throughout the whole house blink. Any thoughts?

    Thanks,

    Mike
  2. valveman

    valveman Moderator Staff Member

    Messages:
    4,495
    Location:
    Lubbock, Texas
    The lights don't blink when the pump turns off, only when it kicks back on. Sounds like you have a check valve between the pressure switch and the pressure tank. Removing that check valve should stop the chattering.
  3. mikeehman

    mikeehman New Member

    Messages:
    6
    Sorry Valveman, I'm sure there is a specific term for what I'm trying to explain but the lights actually blink when the pump shuts off. It shuts down so hard that I can hear it two floors up like someone has hit the pump with a rubber hammer, to the point it rattles the pipes.

    Thanks,

    Mike
  4. Gary Slusser

    Gary Slusser That's all folks!

    It isn't the switch and wasn't the previous switch.

    Water hammer is what you are hearing now. Probably a check valve closing and the pump coming on again in just a second or two. You have a leak or a something wrong with the pump or well plumbing etc..

    Describe your system from the well to the pressure tank. Do you have a submersible pump or jet pump; if jet shallow or deep well (one or two lines from the well?).
  5. mikeehman

    mikeehman New Member

    Messages:
    6
    Thanks for the response Gary,

    I have a 1 1/2"sandpoint up to a check valve into the 1hp shallow well pump with one line exiting the pump. The whole system is in my basement which is 7 feet below grade and the point is down about 16 feetfrom the basement floor.

    Mike
  6. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Just what kind of Check Valve did you install? I'll bet it is a gate type Check Valve instead of an in line spring loaded one. That could be the answer to your water hammer.

    What Valveman was trying to say is that when the power is removed from the Pump Motor, the lights won't blink. They may gain intensity because the voltage came up a few volts from an improper wiring job. When the Pump shuts off, it also comes back on rapidly, this causes the light blinking phenominon. Your doing damage to your motor by letting it do this. Change the Check Valve and I think your problem will go away.

    bob...
  7. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    You may have a waterlogged tank caused by a failed bladder.

    You may have a check valve between the tank and the switch; or maybe an extra check valve between the tank and the switch in addition to the foot valve or the check valve in the suction line.
  8. masterpumpman

    masterpumpman New Member

    Messages:
    729
    Location:
    Virginia Beach, VA
    Speedbump and Valveman are right!

    Speedbump
    Just what kind of Check Valve did you install? I'll bet it is a gate type Check Valve instead of an in line spring loaded one. That could be the answer to your water hammer.

    What Valveman was trying to say is that when the power is removed from the Pump Motor, the lights won't blink. They may gain intensity because the voltage came up a few volts from an improper wiring job. When the Pump shuts off, it also comes back on rapidly, this causes the light blinking phenominon. Your doing damage to your motor by letting it do this. Change the Check Valve and I think your problem will go away.

    Water Hammer is the hard bump you are hearing! It sounds like the wrong type check valve.
    Porky
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