2 wire 14 gauge IS defiantly NOT 230 VAC...
Black and white are Neutral = white Black= 110 vac, and you must add a ground.
230 VAC in the make up box will look like this BLACK=110 RED=110 (DIFFERENT LEG) WHITE=NEUTRAL=NEUTRAL BUSS, GREEN=GROUND BUSS...
Pull the make up box on the compressor / motor and look at the inside cover plate, most usually have a diagram for 230 vac and 110 vac wiring on it. I assume the compressor may be wired either way..230/110..
The Plug you need (Wall and cord) is akin to a large window a/c unit..has 3 blades at a 45 (or so) degree angle..this is a 110 / 30 /40 or 50 amp plug..A standard 2 prong / ground plug is only 20 amps max, 15 usual..
You will also have to check or upgrade the romex going to that plug for proper gauge..and of course be sure the reset breaker is up to par with the load.