You might be feeding both hots from the same phase. Each hot will measure 110 volts to ground, but there will be 0 volts between them. If you move one hot to the other phase, you get 220 volts between them.
You might be feeding both hots from the same phase. Each hot will measure 110 volts to ground, but there will be 0 volts between them. If you move one hot to the other phase, you get 220 volts between them.