Water Pump Pressure Switch

A water pump pressure switch is designed to turn the pump on when the pressure inside the water system falls below a predetermined setting. This switch contains sensors, therefore, when the pressure goes below the setting, the switch turns the pump off, and when the pressure is above the predetermined setting, the pump is turned on. Sometimes, wrong pressure settings can cause problems and can affect the water flow and pressure. If you are facing this problem, you must check the pressure switch. Sometimes factory settings might need to be changed. Adjusting the switch settings might help in correcting the working mechanism of the pump.

Water Pump Pressure Switch Problems

If the water pump is not working properly, do check the pressure switch. Mostly water pressure problems can be attributed to a faulty switch or faulty settings. A blocked pressure switch sensing port due to debris in water might be responsible for problems. The switch consists of a set of pressure adjustment springs and electrical contacts. The set of adjustment springs work together and perform the task of switching the pump on and off. Sometimes problems might be created if the pump off range is set very low, this might cause the pump to run continuously and it might get damaged. Wrong settings lead to an erratic well pump and pressure control behavior. If you have ever seen the switch, you might have seen two pairs of electrical contacts. Sometimes problems could be caused due to corrosion on the electrical contacts. Before you check the electrical contacts, turn off the power source. Check for signs of corrosion. You could either clean the contacts with emery cloth or replace them if need be.

How to Adjust this Switch

You must get your hands on some simple tools and look into the guidelines provided by the manufacturer regarding the pressure setting. You might have to adjust the settings to change the pump cut-in, that is the pressure when the pump is turned on, and the pump cut-out, the water pressure range when the pump gets turned off. To change the settings you need to remove the cover of the switch. Since there are live electrical contacts, you must disconnect the electrical power before taking the switch cover. You will now see a set of adjustment springs. The larger nut in the pump pressure control switch adjusts the pump cut-on and cut-off pressures simultaneously. When you turn the large nut clockwise, both the cut-on and cut-off pressure range is raised. Turning the nut counter-clockwise will decrease the operating range. When you make these adjustments, the gap between the cut-on pressure and the cut-off pressure doesn't change. The nut on top of the smaller spring in the switch is used to narrow or widen the gap between the pump cut-on and cut-off pressures. When you tighten or turn the small nut in a clockwise direction, the cut-off pressure will increase and when you loosen the nut or turn it in the counter-clockwise direction, the cut-off pressure will come down. Always remember not to loosen the nut too much. If the cut off pressure is set at a range that is lower than the cut-on pressure, the pump will keep running and might get damaged. In case, the pump has been completely damaged, you will have to replace it.

The next time you feel that the water system is not functioning properly, make sure that you check the pressure switch. In case, adjusting the switch doesn't help, you might have to replace the switch.