How to Adjust a Pressure Switch for a Well Pump

Low water pressure on private home water wells can be adjusted by the turn of a nut on the pressure switches springs. This type of adjustment should only be done after a thorough check of the water's operational system is performed. Low water pressure may be an indication of a malfunctioning system. By following a basic process you can adjust the water pressure switch in a matter of minutes.

Step 1

Remove all electrical power from the pressure switch and pump system by turning "off" the main power that feeds the water pump.

Step 2

Loosen the nut that holds the protective cover over the pressure switch with the small channel lock pliers. The top connector nut should stay in place on the cover after removal.

Step 3

Examine the inside of the pressure switch and observe the two different sized springs and adjustment nuts. There should be one large diameter spring (approximately 3/8 inch) and a small diameter spring (approximately ¼ inch). Also note the bare contactors that conduct the electricity from the main circuit breaker or fuse to the pump. The large spring and nut will adjust the "cut in" and "cut off" of the pump, while the smaller diameter spring adjusts the "gap" between the "cut in" and "cut off" times of the pressure switch.

Step 4

Turn the larger spring nut with the channel lock pliers in a clockwise direction to raise the cut in and cut off pressures. By adjusting this larger spring, the overall range of the pressure system is either raised (clockwise direction) or lowered (counter-clockwise direction).

Step 5

Adjust the smaller diameter spring for creating a larger "gap" between the cut-in and cut -off times for the pump system. In other words, by turning the smaller nut clockwise you will be increasing the gap, or making the pump cycle longer. By turning the smaller nut in a counter clockwise direction you will decrease the gap of the "on" and "off" times of the pump motor.

Step 6

Replace the protective cover after the adjustments and reenergize the electrical power to test the pump system.