The transformer steps down 120 volts to the 24 volts the thermostat needs and sends out the 24 volts on two wires.
Trane furnace control board wiring.
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It shows the parts of the circuit as simplified forms and the power as well as signal links between the devices.
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A wiring diagram is a simplified conventional photographic depiction of an electric circuit.
Furnace 24 volt transformer.
Thermostats use 24 volts ac from a transformer to control a furnace.
The two 24 volt wires go to the r terminal and c terminal inside the thermostat.
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