I have a 120v 20a receptacle that is measuring 220V at the outlet:
In the panel this circuit is controlled by a double pole 30amp breaker:
I was using a 120V window AC unit in this outlet and it was working fine for years. How is this possible? The unit recently started having problems and I was looking to replace it with a 220V unit. Can I do that with the current configuration? What else do I need to consider (wire gauge and amperage needs of the new unit come to mind)?
Here is the wiring of the receptacle:
And this is a link to the replacement unit in question