By what you say, you're going to need a 12/3. Black to L1, Red To L2, white to N, and ground to ground.
Sounds like this unit has 240 volt loads as well as 120 volt loads. To the breaker, Black/red to breaker, white and ground to their respective bars.
The way you have it, 120 volt loads won't run.
Sounds like this unit has 240 volt loads as well as 120 volt loads. To the breaker, Black/red to breaker, white and ground to their respective bars.
The way you have it, 120 volt loads won't run.