Behind my thermostat I have only 4 wires W,R,G,Y but at my furnace I have 2 extra wires for my a/c condenser, Y and C.
With everything installed per the installation instructions the A/C works fine.
The problem is when I turn on the heat. The A/C runs simultaneously with the furnace when heat is selected.
Using the supplied adapter and not hooking the a/c wires back up, the furnace and thermostat work fine.