How to Wire a Temperature Switch
Temperature switches are devices that respond to changes in temperature. They are found in furnaces and freezers, homes and nuclear reactors. In furnaces, a temperature switch regulates the temperature inside the fire box. In cars, switches monitor cabin temperature. Many other devices have temperature switches that automatically shut down the machine or warn the user when things get too hot or too cold. The wiring scheme is similar in most temperature switches. Does this Spark an idea?
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Things You'll Need
- Wire strippers
- No. 20 wire or larger
- Temperature switch
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Instructions
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Install temperature switch
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1
Removing a faulty switch usually entails cutting or pulling loose a light-gauge wire near the leads of a switch. Locate the screws or clamping mechanism that anchors the temperature switch to the device. Loosen the screws by turning counter-clockwise, unless directed otherwise by your device's manual. Discard the faulty switch or send to a preferred technician for inspection and possible repair.
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2
Locate the gauge on the wire strippers. Insert the wire into the stripper, leaving no more than a half-inch of coating protruding. Close the strippers and spin until the coating is cut. Push the loose coating off the end of the wire.
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3
Insert the positive lead (usually marked with a thin white line or series of "+" signs) into the positive terminal on the temperature switch. Repeat for the negative lead. Tighten the screws on the wire leads, if necessary.
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4
Replace the temperature switch according to the manufacturer's specifications. Typically, this means turning screws clockwise or affixing an anchor mechanism or clips. For screws and bolts: Hold the switch in place and insert the fastener into the hole. Turn the fastener clockwise with a screwdriver or wrench until the fastener will no longer turn. For anchor mechanisms: Either insert the switch into the hole and turn the entire mechanism clockwise until locked in place or tighten the machine screws around the clamps. For clips: Push the temperature switch into its socket until a "click" occurs at each switch. Pull gently on the switch to ensure a snug fit.
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5
Cut and strip the other end of the wire, following the instructions in Steps 2 and 3. Insert the positive lead into the switch output on the device's control panel. Insert the negative lead into the input on the control panel.
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Tips & Warnings
Most devices have a wiring diagram affixed somewhere close to the point at which the power supply enters the machine. On refrigerators, this is usually on the back. On furnaces, it's inside the service panel. On dishwashers, it's behind the kick plate.
It is important to purchase a temperature switch designed to fit your specific application. It must have the appropriate switch thresholds and temperature tolerances or your appliance could malfunction.
