Secondary condensate ports

[kweiss]

I see an occasional older unit with the secondary plugged. I see very few float switches in attic installations, these are more common on vertical closet units that I have seen. Commonly I see what I consider correct, and you seem to as weel, in newer construction with the secondary stubbed with a short pipe to the pan.

I have also run into the arrangement where the secondary is plumbed directly to the pipe running to the soffit and a tee allows the pan to drain to the same pipe. In most of these it would rely on the water seeping out of the cabinet to get to the pan, if the pan ever came into play. What is your opinion of this arrangement?

[Bruce A. King]

Secondary port and pan sharing the same pipe to the exterior is a good method. I just learned from an hvac guy that the pan should be 3 inches larger than the cabinet on all 4 sides to ensure that any condensation goes into the pan.