Should HVAC have cleanout tee near the trap drain?

Question

My 5yo 4.5 ton variable Bosch air handler is sweating a bit, in my spray foam attic that is averaging 80° and 65% humidity. I've recently washed the coils outside, tried to vacuum the condensate PVC pipe from the outside, but there's still 1/8th inch of water in the safety pan where it's sweating upstairs.

Is it not a good idea to add a clean out tea after the P-trap? The three-quarter inch PVC drain does a couple 90° turns and heads straight down my wall cavity into the crawlspace where there's another 90° bend draining it right outside in my backyard. It's a steady trickle of water. Link to video of the setup

Answer 1

(A pic or video is worth a thousand words.)

Now seeing the video, I would guess that there is some blockage in or to the drain inside the air-handler. That much water is more than some sweating.

A clean out before the first elbow outside the unit would make cleaning in both directions easier.

Answer 2

Yes you should have a cleanout where you say you should. A good way to add one would be to buy a new better P trap. Transparent for inspection and with cleanout caps on both sides of it.

Also, the way you hooked up your dehumidifier, if the secondary line gets blocked further down, the dehumidifier condensate will back up into the Air Conditioner secondary pan. You have a sensor there that will shut down your A/C but it won't shut down the dehumidifier. You could rig that up with that sensor or with a new IoT sensor and smart switch.