I'm having issues with an installation of a heat/ac unit. A technician (not the original installer) said the ac evaporator coil was installed in reverse. The installer said the unit is a mulit-positional unit and it does not matter what position it is installed. The apex of the coil is pointed toward the furnace and as a result the manufacturers insulation was torn from the plenum walls and sitting on the coils (trapped when the air flows across it). Does multi-positional mean that you can have the apex of the coil pointed toward the air flow? Or does it mean that the ac coil can be installed in a vertical or horizontal position, but not installed in reverse? Thanks in advance for your wisdom.