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How to Set a Pressure Pump

A pressure pump controls the force of water flowing through a plumbing system. Pressure pumps are used in hot tubs, residential well-water systems and other equipment to ensure the water flow is sufficient to meet the demands of the specific application. Adjustable pressure pumps let you control the force of water through the system as conditions change. For example, increasing the well-water pressure might be necessary in cold weather to ensure the water pressure remains constant. The location of a pressure pump varies with the type of equipment. Adjustments typically take only a few minutes.

Things You'll Need

  • Screwdriver set
  • Watch with sweep-second hand
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Instructions

    • 1

      Shut off electrical power to the pump motor at the circuit breaker or the fuse box. Turning off the pump does not stop electricity from flowing to the pump motor.

    • 2

      Open the service panel on the equipment, using a screwdriver to take out the screws. Locate the pump inside the cabinet. While the location varies with the type of equipment, pressure pumps are invariably connected to hoses with clamps. The adjustment knob is on the top or side of the pump. Look for a control marked with a series of gradations.

    • 3

      Turn the control knob clockwise to increase pressure generated by the pump or counterclockwise to lower the pressure setting. The gradations on the knob are marked in pounds per square inch. Do not exceed the recommended pressure setting for your particular equipment. If you do not have the owner's manual, contact the manufacturer.

    • 4

      Use pliers to turn the nut on the larger of the two pump springs clockwise to turn on the pump sooner when the system detects a drop in pressure. Twisting the nut counterclockwise lengthens the time before the pump will activate in response to falling pressure.

    • 5

      Twist the nut on the smaller pump spring clockwise to cut off the pump faster when the desired pressure level is achieved. Turning the nut counterclockwise causes the pump to continue working longer.

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