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Take the thermostats cover off and expose the low voltage wiring, Y or Yellow is the AC circuit, Y1 will be 1st stage cooling, Y2 will be 2nd stage cooling, You may also look at the furnaces low voltage terminals for the various circuits.

You will see screws/terminals marked, R /Red, W /White, Y /Yellow, G /Green and C /Common.

The R terminal is where the 24 volt "hot leg" of power enters the thermostat , for the thermostat to send the 24 volts to your desired mode/ circuit.

W = Heat, Y = Cool, G = Fan and C is the "common" or neutral leg of 24 volt power.

Common is akin to the negative on a battery, it is called Common as every 24 volt circuit terminates on Common to complete the circuit.

If you had a 2 stage heat system there would be a W1 and a W2.

Same with the AC mode. Y1= 1st stage cooling and Y2 = 2nd stage cooling.

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