Thank you all very much for the advice. I must say that all this
internal gripping is a little annoying. And I must comment that in the
Friedrich Wall mounted split type air conditioners installation
instructions found at:
http://www.friedrich.com/pdf/prod_duct.asp

It says: "If possible, do not install the unit where it would be
exposed to direct sunlight. (If necessary, install a blind that does
not interfere with the air flow.)

I am just reporting what I read.

Thanks again.
Jason.