hvac condensation

AC was installed last week, they drained it down a vent in the attic, it was stopped up and he snaked it and then added Nu Calgon Drain Solve. Meanwhile right before he added the chemical, I was cleaning the p trap the vent had backed into the sink and everything under there was cheap any...

Hello there! So my HVAC system is in the attic. There is a tray (For condensation, with the outflow to the outside of the house). And there is a main condensation outflow pipe that goes down to to nearest bathroom (sink). Looks like the main one is clogged? My tray keeps filling up and water...