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The only trap you need is already in the furnace.
What this means is you come outthe ac coil with 3/4 pvc..
when you turn it down towards floor, you use a tee instead of a 90 degree elbow. This leaves the top part of tee pointing up with no cap.
Then as the pipe runs down vertically you can run the furnace drain directly into the same pipe with a tee.
If you need I can draw something up for you
see if this helps
I understand what you want to do...but we do not want to trap the condensate lines. That is why the manual specifically states to use open tee. The water would overflow pan before it could reach the top of tee anyway.
It is common for the furnace to be trapped but not the ac coil when on the positive side of pressure...we only trap on commercial units if drain is on negative side.
The deposit you saw go through is returned at any time you wish...I can send to customer service right now for you.
As far as installing the way you describe, I would opt out since it is not the normal installation I am accustomed to installing or teaching.