Eugene,
Good question. I had to tackle that problem early on . The drain that the cooler had was a small tube with two 90 deg bends in it, and it was plugged with the insulating foam from the cabinet. I discovered this cool feature about a weekor so after turning the unit on with the new cedar lining. I had to replace the wet floor, so I pulled it out and drilled a hole straight down through the drain large enough to slide a fine sharpie through. I then removed the guts from the sharpie cut the tube to length, roughed it up and installed it. It has a tight fit, and I was able to get some 5min epoxy between it and the insulating foam , so It is bonded very strong, with a good seal from the outside, no epoxy inside. I also sealed that joint on the inside with the hot glue gun, I was just being careful to keep the epoxied joint completely sealed off from the interior, the HG is non toxic and seals well enough.
Tube will drain out instantly now, no pooling of condensation at all. Also the glass dish in the bottom of the humidor has a drain hole drilled through it, and the cabinet is leveled across the front but sloped rear to allow draining if need be. It has a flat bottom so I was able to use a diamond burr in my drill press to drill a 1/4" drain hole, which is placed directly over the drain in the cabinet back. The beads constantly re use the condensation, In my pic that is what the dish looked like after a short one month trip away, I stirred the wet beads to the front, but that was it. The drain is mearly a fresh air inlet at this point. There is a small ammount of beads in the drain as well, any moisture would flow right through but it is closed.
The new placement in the house is in a much cooler corner. The cabinet is holding 63f and 62-63RH.