How to Wire a Pressure Switch

In this video, we show you the best way to a pressure switch for 115V and 230V pumps. This method will work for any pump that runs directly off of a pressure switch - including jet pumps, well ...

Water pressure switches in well systems control the amount of water pumped to the system's storage tank. As the tank is filled, the water pressure increases within it. When the tank reaches its peak pressure, typically at 60 pounds per square inch, the switch cuts the electrical power to the water pump.

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The pressure switch on your well is responsible for automatically sensing the need for more water in your pressure tank and supplying power to the pump. It also shuts the pump off after the pressure in your tank has reached the preset limit. When it fails to perform either function correctly, it's time to remove the switch and install a new one.

Well pump wiring diagnosis & repair: this article describes troubleshooting a submersible well pump that was causing tripped circuit breakers and that pumped water only at a slow, reduced rate and pressure. Ultimately using some simple electrical tests the homeowner traced the water pump problems to a nicked well pump wiring circuit wire.

All well pumps come with a wiring diagram which provide specific instructions for your specific pump. In most cases if the leads are the same color then the polarity does not matter, but check this with the installation sheet and wiring diagram. Wiring a pressure switch is simply breaking the circuit power through the pressure switch contacts. Dave

Replace a Two Wire Pump. The diagrams for both the two and three wire pumps can be downloaded using Adobe. To replace the two wire pump: After determining the voltage is zero, disconnect the motor wires directly from the pressure switch box, M1 and M2. The green ground wire should also be terminated to the box and a ground coming from the panel.

Then disconnect the wiring (Photo 1). Close the valve from the pressure tank to the house. Then drain the pressure tank. Next, remove the old switch (Photo 2) and gauge (Photo 3). Wrap the pipe threads with Teflon tape and reassemble. Install the wiring, close the faucet and repower the pump. Video: Fixing a Dead Well