At these points you can cut and run secondary drain lines into the main shaft.
Main condensate drain into vent in the attic.
Once everything s connected turn on the wet dry vac and let it run for about 3 minutes.
It didn t specify where the main drain should go but it did say to shape the drain line so it would form a trap.
Remove the cap from the condensate drain line.
This is a precaution that prevents the vent from.
The evaporator was located in the attic.
It appears that this condensate drain only drops into that vertical standpipe an inch or two and if there is still a decent opening around it to let air into the standing drain line then you got an air gap between the end of the condensate drain and the p trap below so it should.
Fix the hose attachment to the wet dry vac s hose and position it into or flush with the end of the drain line.
Use no hub fittings to connect a pvc fitting to cast iron or abs pipe.
The vent opening should always rise above the trip level of the condensate overflow switch when it is in the primary drain line or pan or above the secondary aux overflow port on the primary drain pan.
The waste vent runs from your main drain line to prevent back pressure in the main sewer line.
This helps ensure that if a backup occurs that the water properly trips the switch instead of overflowing out of the vent.
Then use duct tape to seal the gap between the hose and the drain line.
This pipe can be interrupted at any point up to 4 feet from the vent shaft that generally exits your home from the roof or the side of the home.
Meaning that the drain tube coming out of.
That would include the main plumbing vent stack.
Cut the pipe and connect a reducer tee fitting.