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Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?
The primary condensate line needs to be trapped "properly".
The secondary condensate line needs to be "trapped" and "trapped properly".
That copper stub out looks like what Jim said, and needs to be capped.
The 'vent' (if that what it is supposed to be) going up vertically from the downstream side of the trap, looks to me like it is a 90 elbow turning back over the pan, with another 90 degree elbow turning down into the pan, and has (has had) water dripping from it. This is not going to work as a "vent", that's for sure. My guess is that the "vent" was short and it overflowed when the primary condensate line backed up, so the tech said 'I can fix that, I'll make it drain back into the pan - simple enough to do, just install 2 90 degree elbows.'
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