You connect the two hot wires from your power source to the two lugs in the. On the other side of the disconnect you connect the two hot wires to the A/C unit to the other two lugs. You tie the neutral wires (white) together and insulate them. You ground the ground wire to the box and run a ground wire to the AC unit.
So, you should have a red, black white and ground wire on the supply side to your disconnect. The red and black are your hots from your main box to the disconnect. They go on one side of the disconnect. The units red and black go ont other side. You connect the neutrals and ground it and you are in business.
Don't guess, because you are fooling with 220 Volts AC which will knock you silly.
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