Furnace Thermostat Wiring Diagram

Circuit diagrams for science are traditionally drawn with the battery or power supply at the top. This is not wrong, but there is usually no advantage in drawing them this way and I think it is less helpful for understanding the circuit.

DPDT switch DPDT = Double Pole, Double Throw. This switch can be wired up as a reversing switch for a motor. Some DPDT switches have a central off position.

Wires joined A blob should be drawn where wires are connected (joined), but it is sometimes omitted. Wires connected at crossroads should be staggered slightly to form two T-junctions, as shown on the right.

SPDT, 2-way switch SPDT = Single Pole, Double Throw. A 2-way changeover switch directs the flow of current to one of two routes according to its position. Some SPDT switches have a central off position and are described as on-off-on.

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