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Old 09-22-2012, 10:20 AM   #1
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total newbie needs help with thermostat


Hello everyone. I admit to just joining now in order to seek advice on how to wire this thermostat. I'm building an egg incubator, and I bought a thermostat to wire to a light bulb which is the heat source. The circuit is totally basic, but the wiring diagram for the thermostat is all greek to me. Can anyone help me with this? I'm supplying a link to the pdf instructions, and photos of the thermostat. Thank you thank you!

Instruction manual
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Old 09-22-2012, 11:28 AM   #2
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total newbie needs help with thermostat


Hi Tamara,

[I'm pretty much a newbie too. If my post is in error, anyone please correct me ]

This thermostat is basically what is called a single pole, double throw switch. It connects a single circuit (wire) to one of two outputs, depending on whether the temperature is increasing or decreasing.

Note the numbers (1, 2, 3 and 4) stamped next to the wire terminals at the bottom of the case.

Terminal 3 is ground. Connect this to the ground wire (bare) in both your incoming ("hot") cable and the outgoing ("to light") cable.

Terminal 1 is for the circuit (wire) being switched. Connect the black wire in your outgoing cable to this.

Terminal 2 is for the power source*. Connect the black wire in your incoming ("hot") to this.

Terminal 4 leave unconnected.

Connect the white ("neutral") wires in both the incoming and outgoing cables together.

I'm pretty sure you'll have to mount this in/on a work box so the terminal connections are not exposed.

* Hot could go to Terminal 1 and out to 2, but then Terminal 4 will be hot when the temperature is falling.

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Old 09-22-2012, 11:33 AM   #3
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Thanks! I figured I'd be using 1 and 2. I'll get to wiring right away, and hopefully I don't blow the breaker when I plug it in .
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Old 09-22-2012, 02:18 PM   #4
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Brilliant! It works perfectly. Thanks Dave
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Old 09-22-2012, 02:26 PM   #5
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total newbie needs help with thermostat


You're quite welcome, Tamara.
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