I ran both wires. sorry, I wasn't being specific enough. It was red and black
Red and Black are the colors for hot legs. White is neutral. The two wires you ran should both have went to a breaker, nothing to the neutral bus. That means you have a 240 volt feed. A neutral is required for a 120 volt feed.
Furthermore the way this controller is designed doesn't allow for you to make a 120 volt receptacle as there is no neutral.
Not saying a sparky couldn't rewire it to make this happen but it's really not the way to do it.
If you want a 120 volt outlet just run another feed to another breaker, this time a single pole 15 amp breaker using 14-2 nm-b wire. That said, you should REALLY hire an electrician to do this.
P.S. I hope you connected the ground wire to the ground bus on your existing 240v run.