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Thread: Procedure to set pressure

  1. #1

    Question Procedure to set pressure

    Would appreciate someone out there who could give me an answer. Here is my situation:

    1. Shallow well ~20-25 ft deep (I didn't dig it - was here when I bought the house) - used to water lawn & flowers
    2. 1.5 HP Flotec Sprinkler Pump
    3. Square D Pumptrol 20/40psi
    4. Flotec 82 Gal bladder tank - charged to ~52psi

    I do not know how to set the pressure. I cannot read the schematic on the inside of my Pumptrol - it is faded. I checked the Square D website hoping they would have a schematic but I couldn't find one. I turned the two adjustment nuts (trial & error) until the pump quits running when I shut the faucet and starts again when I open a faucet - but I really don't know what I'm doing...

    Bottom line: How do I adjust the pressure properly? Do I have too much pressure in the air tank?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    For your pump settings, you have too much pressure. The pressure in the tank (with the pump off and all water pressure removed - i.e., let the water flow until it stops on its own), you should have 1-2 pounds LESS than the low pressure turn-on point (18-19 pounds for a 20-pound low pressure setting). WIth that much pressure in the tank, the pump would see more pressure than its high point, and may not turn on and fill the tank. But, since there is no water in the tank, as soon as you open a sprinkler, the pump would turn on, since there is no water under pressure compressing your bladder, the pressure would drop to zero immediately. That is very low pressure, so your performance on the sprinklers may not be great. You may want to bump up the pressure, if the pump and water supply can handle it. Think of your pressure tank as just a storage tank pressurized by the pump. It gives you some water under pressure so that the pump doesn't need to run continuously as you turn water on and off - it won't raise your water pressure.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Talking Still need to know how to set pressure...

    I appreciate the answer, but still need to know how to work the two adjustments on the Pumptrol - I can't read the legend inside the cover due to fading.

    Quote Originally Posted by jadnashua
    For your pump settings, you have too much pressure. The pressure in the tank (with the pump off and all water pressure removed - i.e., let the water flow until it stops on its own), you should have 1-2 pounds LESS than the low pressure turn-on point (18-19 pounds for a 20-pound low pressure setting). WIth that much pressure in the tank, the pump would see more pressure than its high point, and may not turn on and fill the tank. But, since there is no water in the tank, as soon as you open a sprinkler, the pump would turn on, since there is no water under pressure compressing your bladder, the pressure would drop to zero immediately. That is very low pressure, so your performance on the sprinklers may not be great. You may want to bump up the pressure, if the pump and water supply can handle it. Think of your pressure tank as just a storage tank pressurized by the pump. It gives you some water under pressure so that the pump doesn't need to run continuously as you turn water on and off - it won't raise your water pressure.

  4. #4
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    Read the "How do I set my pressure switch" link.

    http://www.pumpsandtanks.com/faq_page.htm

    bob...
    Last edited by speedbump; 07-15-2005 at 12:40 PM.

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