guys,

my existing outlet for my AC is 240V now we bought a new unit w/c is
110V, but when i opened my 240V receptacle it ony has 3 wires, 2 hot
wires w/c is both 110V & 1 ground, no neutral wire, my question
is:

1. i used 1 of the 110V wire & put the ground wire on the other
line & its now working as 110V, how dangerous is this?

2. i have no neutral wire, what is my other option to make my outlet a
110V w/o using the ground as the other line

thanx