It might also be that your pressure switch unit is just defect. When the pressure in the system drops to a preset low setting the pump will turn on (commonly known as the cut-on pressure). The usual range is 40-60 PSI. Square D Pumptrol 40-60 PSI Well Pump Water Pressure Switch with Low Pressure Cut-Off - Box Packaging (46) Model# FSG2J24M4BP $ 22 99. The Pressure Switch tells the pump that delivers water to your home when to turn on and off. I tried the lever again and it engaged the contacts but then quickly disengaged. galvanized nipple. To check if your water pump itself is working, you could connect the 2 wires that are connected to the switch, with each other, so that you close the electrical circuit. The pump should run now. If you have a private well water system, your Pressure Switch is an integral component. I lifted the pressure switch lever to get the pump going. Name: water pump pressure switch wiring diagram – Wiring Diagram for Water Pump Pressure Switch Best Funky Pressure Switch Wiring Schematics Image Collection Simple; File Type: JPG; Source: ipphil.com; Size: 448.46 KB; Dimension: 3933 x 2185; Variety of water pump pressure switch wiring diagram. The change in pressure that activates the switch is provided via the water from the well. Find Pressure switch water pump accessories at Lowe's today. The cut-on pressure is the low pressure that starts the pump and the cut-off pressure is the high pressure that turns off the pump. Pressure switches rely on water pressure to do all the work. Square D Pumptrol 60-80 PSI Air Compressor or Well Pump Pressure Switch with higher hp ratings (13) Model# 9013GHG2J25 $ 91 54. x 6-in. The starting and stopping of a well water pump is typically controlled by a pressure switch similar to the one shown below. The switch is preset with both the cut-on and cut-off pressure. 30/50 Low Pressure Switch for Well Pumps This pressure switch signals the pump to This pressure switch signals the pump to start when the water system drops to 30 psi (factory set) and stops at 50 psi (factory set). There could be other reasons why this is happening, such as a decompressed pressure tank or a failed pump. Switches come in three pressure ranges: 20 to 40, 30 to 50 and 40 to 60 psi. Worked for about a minute and cut off. Water pressure was around 10 PSI. The tank was empty and the gauge was basically down to 0 PSI. If not, the water pump might be defect. Pressure Pump, Pressure Switch Repair: Introduction I have a number of rain water tanks which I use to water my vegetable garden during the summer. Always replace your switch with one of the same rating (usually printed inside the plastic cover of your old switch). 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