How to Install a Square D Water Pressure Switch
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. You don’t have to call a plumber for this simple operation. If you know how to use an adjustable wrench and a screwdriver, you can do this one yourself.
Things You Will Need
- Adjustable wrench
- Screwdriver
- Wire brush
- Plumber’s tape
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Turn off electrical power to the well at the service panel.
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Open the faucet under the pressure tank. Allow the tank to empty. If the plumbing underneath the tank is not equipped with a drain valve, open the closest faucet.
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Unscrew the acorn nut on the top of the pressure switch and remove the cover.
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Use a screwdriver to remove the wires from the switch’s four terminals. Remove the ends of the wires from the switch.
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Place your adjustable wrench on the hex nut on the underside of the pressure switch. Turn the pressure switch counter-clockwise to remove it. Leave the 1/4-inch nipple underneath the switch in place.
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Clean the 1/4-inch nipple’s threads with a wire brush. Cover the threads with three wraps of plumber’s tape.
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Thread the new switch onto the nipple. Tighten the switch with an adjustable wrench.
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Connect the two wires from the pump to the terminals marked “T1” and “T2”. Put the black wire on “T1” and the white wire on “T2.”
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Connect the two wires from the service panel to the terminals marked “L1” and “L2.” Put the black wire on “L1” and the white wire on “L2.”
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Place the cover on the switch and tighten the acorn nut by hand. Do not use a wrench.
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Close the faucet you used to drain the tank.
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Turn the power on at the service panel. Check for leaks as the pressure builds in the tank.
Tip
Many older installations mounted the pressure switch on 1/4-inch black or galvanized pipe. If the mounting pipe under your switch is corroded, consider replacing the steel nipple with one made out of bronze or brass.
Warning
Shut off power before attempting any service or maintenance on your well.
The Drip Cap
- 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.
- Open the faucet under the pressure tank.
- Use a screwdriver to remove the wires from the switch’s four terminals.
- Put the black wire on “T1” and the white wire on “T2.” Place the cover on the switch and tighten the acorn nut by hand.
Writer Bio
Finn McCuhil is a freelance writer based in Northern Michigan. He worked as a reporter and columnist in South Florida before becoming fascinated with computers. After studying programming at University of South Florida, he spent more than 20 years heading up IT departments at three tier-one automotive suppliers. He now builds wooden boats in the north woods.
Photo Credits
- Jupiterimages/Photos.com/Getty Images
- Jupiterimages/Photos.com/Getty Images
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