Curmudgeon wrote:
I'm selling a house where the indoor airhandler for the heat pump has
a vertical condensate drain that runs thru the floor into the crawl
space. It was installed that way new.
Now, an inspector for the buyer lists that drain as a "fault" because
it is not trapped.
Does a vertical drain need to be trapped.
I'm not going to replace it, but now I'm curious if the inspector's
right or not.
Pro AC tech opinion requested ( since I dare not ask this question on
their newgroup).


Most residential air handler manufacturers require traps.

Code usually says something like this:
"Condensate drains shall be trapped as required
by the equipment or appliance manufacturer."