240 Volt Disconnect Wiring Diagram - Oct 25, 2014 · Back in the olden days, thermostats were simple on/off devices that didn't need their own continuous power supply. Modern thermostats with Wi-Fi and backlit display, by contrast, need a steady supply of juice.The C wire, or "common wire" enables the continuous flow of 24 VAC power to the thermo. The diagram from the datasheet shows you which pins are the base, collector, and emitter. The second picture shows how the pins match up to the circuit diagram. This transistor is awesome because it will allow us to use 5v from the arduino to switch the much higher 12v required by the motor, which would destroy our Arduino if we connected it.
240 Volt Disconnect Wiring Diagram
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