Ductless mini-split condensate drain
Hi all- I have two ductless minisplits installed in a new construction residence. Both indoor head units have gravity condensate drains. I now need to determine how to terminate these drains. I live in a cold climate (New Hampshire).
First option is to drain outside the building envelope and add waterless traps to prevent air infiltration without concerns of the traps freezing. https://www.johnstonesupply.com/product-view?pID=B18-107
Second option is to drain through the basement slab into the crushed stone below. I have an interior perimeter drain/vent for radon reduction, so I expect I would still need a trap in-line to prevent radon/air moving up the condensate line when the units are not in use.
Anything I’m missing here? Which would be the preferred drain method?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Replies
Outside. Squeeze a chunk of that ridge vent material that the name is escaping me...to keep the bugs out. Minisplits don't like traps.
Definitely not under the slab. Another option is into a regular drain.
Ok, so far the consensus is- drain the condensation outside. (Unfortunately there are no nearby interior drains I could tie into for these lines). So, is there concern about air infiltration through the condensate lines if no trap is used?