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Anthony Lombardy

How to wire this wall thermostat which has 1-black, 1-red, 1-white wire but wiring has 2-black and 2-white wires & neutral?

The thermostat is a single pole, 110 volt unit. The house wiring has two lines into the box, with the white wires already banded with a wire nut, and the two black wires separated. There is also the bare neutral wire.

The old thermostat wired directly to the 2-side screws, with the neutral to the green screw. The new thermostat has a red and black wire, and a smaller white ground wire. There is also a green screw for neutral. How can you determine which black house line goes to the load, and the other the line, and where does the ground wire connect, since there was none with the old thermostat.

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1 Answer from this member:
scott d
by scott d Earned 8,216 community points in Building Supplies
December 23rd, 2008
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