Is the U-bend (in 1st picture) necessary? I'm guessing it's preventing backflow of gas from the drain.
My A/C (heatpump) is leaking condensation.
- Disconnected the drain pipe below the "u" and drained into a bucket. NO LEAKING in drain pan for the 36 hours of testing. Bone dry.
- Reconnected. Moved the terminating end from the floor drain to a small pan. It filled 1 pint in about an hour.
With everything hooked up properly, it's probably a pint in 8 hours. When I originally discovered it (b/c it was overflowing to the floor) it was full. So probably 3 gallons or so.