Great Scott!
Be sure not to mix up the order of those lines going into the indoor unit.
On the Sanyos, two of them are 230vac and the other one is the low-voltage DC signal line.
I believe the signal line needs that ground wire to work right.
Anyways, if you stick one side of the 230vac on that signal line, it could smoke the comms.
I've heard, mixing up these lines, is the most common reason why new installs fail to work.
I've also heard of one case where the unit would only cool.. No heat..
Turned out to be a bad 230vac install. The electrician only provided 120vac.
Good Luck!