I recently got a new package unit installed to replace the 30-year-old one that came with the house. It works MUCH better than the old one, which had a slow leak and iced up regularly.
The round hole on the left has a standard pipe fitting inside, and currently it is just dripping straight down.
How bad is it to leave it like this? This Bryant system has the coils positioned before the blower, so presumably the drain is under suction when the unit is running. Fortunately, it doesn't run all the time.