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Yes, you can connect the wire to RC. And the white would go to Y just like your old thermostat.
Sorry, had to step out for a service call. Did you have add'l questions on this?
Follow the brown wire back to the furnace or air handler that this thermostat feeds. See if it lands on a C or common terminal.
It could be a common. If you take a voltmeter and test across R to the brown wire, you should see 24 volts AC.
OK, well this may not be the best choice in thermostats then. Unless you can run a new wire.
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