How to Check an Oil Pressure Switch

Knowing how to do an electrical repair like replacing a pressure switch Square D can save you time, money and hassle. Follow our guide for how to check an oil pressure switch.

Square D Pressure Switch Overview

A Square D pressure switch is the common way to control pressure in a water pump or air compressor. An air compressor operates at higher pressure, while a water pump pressure switch operates at a lower pressure. However, the wiring of the Square D pressure is generally the same. A Square D pressure switch controls the pump, and the oil pressure switch location is most likely on the outside of the pressure tank.

When to Replace Your Square D Pressure Switch

A Square D pressure switch can become worn out over time and lead to issues with your pump. You can test your pressure switch by tapping gently and listening for a click. If you want to remove and replace the Square D pressure switch, you'll need to check the pressure range of the old switch. The ranges are 20 to 40, 30 to 50 or 40 to 60 pounds per square inch (PSI), and you can find the information by pulling off the cover. Make sure to replace your pressure switch with another one of the same pressure. You may also see information about whether the switch can work for water systems or air compressors and details about the amperage rating. The amperage rating of your new switch should be higher than the value of your motor's amperage capacity.

Installing Your Square D Pressure Switch

Make sure the pump is switched off before disconnecting the old wiring and getting started on installing a new Square D pressure switch. Shut the pressure tank's valve, then drain the pressure tank safely. Next, remove the old pressure switch. You will see two sets of wires: one set from the pump motor and one set from the power source. The new wiring will likely be very similar, so make a note of how they connect to the old pressure switch. A new Square D pressure switch will come with installation instruction. Read these instructions fully to get the most customized information before your installation attempt.

Safety First

When working with electricity, safety is of the utmost importance. Always double check that your power is off, wear the correct safety equipment and make sure someone is nearby in case of an emergency.