Had a sewer contractor out to remove an old pump and install new. He suggested another contractor to wire up new 230 VAC pump. All bad.

Concern I have is one hot leg is to pump at all times while other hot leg is turned on by level switch , Can this burn up 230v single phase pump motor?

1 hot leg to float switch through on/off switch. Switch turns pump on and off.
One hot leg through on/off switch
other pump wire to ground.

Thanks