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.
Main condensate drain into vent in the attic.
At these points you can cut and run secondary drain lines into the main shaft.
That would include the main plumbing vent stack.
In the attic tap into a conveniently located vent pipe.
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.
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 evaporator was located in the attic.
Then use duct tape to seal the gap between the hose and the drain line.
Once everything s connected turn on the wet dry vac and let it run for about 3 minutes.
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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.
This is a precaution that prevents the vent from.
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.
Use no hub fittings to connect a pvc fitting to cast iron or abs pipe.
Cut the pipe and connect a reducer tee fitting.
Meaning that the drain tube coming out of.