So where do you place your condensate drain trap on a WI freezer, where the drain goes outdoors in the Northern states, where we have freezing temps in the winter.
Normally, I run a 7/8” copper line, straight out (with a good pitch and a union) and the trap runs parallel to the outside wall. Everything covered with 1/2'” armaflex and a self-regulating heat-tape. I run a 1 ¼ PVC sleeve thru the wall so I can get the heat tape outside for the trap.
I have seen traps inside the freezer, and they seem to work OK as well. However, you have to heat the trap year-round this way. On the up-side, the trap can't be vandalized if it's in the box.
So what do you do? Ice, you can’t answer… you have been out of the NE too long!