"buttoned up? "tech left, he left one outside fan disconnected " maybe
disconnected means something different to you.
The OP stated that the service guy had ""buttoned up" the units and
told him that they were ready for use before he left. I think that is
an appropriate and clear use of the term "buttoned up." To me, that
means he put the covers back on and they were supposed to be ready for
use. How's the OP supposed to know that the guy did a half assed job
and left a fan inside disconnected? Like anyone else, he just turned
the unit on. The service guy is a fault here, not the OP.