182G New A/C Install

Whoa there a sec. I  just now got back on my PC and was able to navigate the photo. Hard to get my bearings in the photo but I think what you're calling a bare copper wire is really the temp probe for the thermostat. Do not cut, bend, or damage it. Does it seem like it might be a tube?  trace it back ans see where its coming from. 

You guys could both be right.  It isn't a hollow tube, it is a copper wire, I did end up attaching the "wire" to a screw on the frame.  If it is some sort of temperature probe, I don't know how it would apply to my system.  It's ductless direct below the unit and the selector controls are directly controlling the unit (one selector going from warm to cool the other fan speeds and A/C speeds).  I did a test run with the A/C and it cooled the trailer off in a half hour in the middle of the day so I'm happy.  I managed to run it on low cool without tripping my 15 amp house breaker that it was plugged so all of the wiring seems to be good.