Quick Answer
Choosing the right pressure switch for a jet pump involves matching the switch's setpoints to the system's operating pressures. Typically, the low-pressure setpoint is 10-15 psi and the high-pressure setpoint is 30-40 psi. The switch must also be compatible with the pump's voltage and amperage.
Understanding System Pressure
To choose the right pressure switch, first determine the total dynamic head (TDH) of the system. This includes the height of the water table, pipe elevations, and any other vertical components. For example, if the water table is 100 feet below the pump and the pipe rises 10 feet, the TDH is 110 feet. Next, consult the pump manufacturer’s guidelines for recommended operating pressures. For a shallow well jet pump, the low-pressure setpoint is usually around 10-15 psi, and the high-pressure setpoint is around 30-40 psi.
Selecting the Right Switch
When selecting a pressure switch, look for a model with adjustable setpoints. This allows you to precisely match the switch to the system’s operating pressures. A switch with a 1-2 psi adjustment range is a good starting point. Also, ensure the switch is compatible with the pump’s voltage and amperage. For example, if the pump is 230V, choose a switch rated for 230V. Additionally, check the switch’s temperature range, as it should match the ambient temperature in the pump’s location.
Additional Considerations
When installing the pressure switch, ensure it’s positioned in a dry location with good airflow. This prevents damage from water or moisture. Also, consider installing a pressure gauge to monitor the system’s pressures and adjust the switch setpoints if necessary. Regularly check the switch’s operation and replace it every 5-7 years or as recommended by the manufacturer.
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