Im in a apartment building and installing a condesent drain, because I couldent go out the top of the unit which is factory with this unit I turned the purge sideways and the book says if you do that than the original drain is useless and you have to run a different way, the drain is going out the left side of the unit below the blower, how is the best way to run the drain, as far as I understand comeing off the purge I have to run a T on the 3in PVC drain then im kinda lost from there. The book dosent do a very good job explaining the best way to run the drain with the purge horizontal out the left side