I'm installing some wall heaters at our cabin. Posting with the super spotty cell reception, so I apologize for keeping this terse.
Here's the relevant part of the wiring diagram:
We have standard 120/240 service with a 100 amp panel. The heater has 12/2 wire running to it from a thermostat. It's on a 20 amp breaker. Do I just attach the black wire to A, cap off C, and attach the white to B to run it in 750 watt mode? The L1 and L2 part is throwing me off.