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How do I turn down the pressure on my water pump?

Published in Water Pump Adjustment 3 mins read

To lower the pressure on your water pump, you'll typically adjust the pressure switch. The pressure switch controls the cut-on (the pressure at which the pump starts) and cut-off (the pressure at which the pump stops) settings.

Here's how to do it:

  • Locate the Pressure Switch: This is usually a small, box-shaped device with a visible spring and adjustment nut, located near your pressure tank.

  • Adjust the Nut: Turn the nut counterclockwise to lower both the cut-on and cut-off pressure. The reference states: "Turn the nut counterclockwise to lower both cut-on and cut-off pressure or clockwise to raise both cut-on and cut-off pressure."

  • Monitor the Pressure: Keep an eye on the pressure gauge as you make adjustments. Make small adjustments and check the gauge to avoid going too low.

  • Adjust Pressure Tank Air Charge (If you adjust the cut-on pressure): If you've adjusted the cut-on pressure, you'll also need to adjust the air charge in your pressure tank.

    • How to Adjust the Air Charge: The pressure tank should be set at 2 PSI less than the cut-on pressure. So, if you've adjusted the cut-on pressure to 40 PSI, the air charge in the tank should be 38 PSI. Use a tire pressure gauge to check the air charge and add or release air as needed.

Example:

Let's say your current pressure settings are 40/60 PSI (pump cuts on at 40 PSI and off at 60 PSI) and you want to reduce them to 30/50 PSI.

  1. Turn off the pump.
  2. Turn the nut counterclockwise a small amount.
  3. Turn the pump back on and observe the cut-on and cut-off pressures.
  4. Repeat steps 2 and 3 until you reach the desired 30/50 PSI range.
  5. Adjust the air pressure in the tank to 28 PSI.

Important Considerations:

  • Safety First: Always turn off the power to the water pump before making any adjustments.
  • Gradual Adjustments: Make small adjustments and observe the pressure gauge. Avoid making large, sudden changes.
  • Check Your Tank's Pressure: Ensure your pressure tank is functioning correctly before making adjustments. A faulty tank can cause pressure fluctuations.
  • Professional Help: If you're uncomfortable making these adjustments, consult a qualified plumber or well technician.

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