They can and will dry up, trap primers are something that would work, but can fail if not attended to.
If you have a heating and air conditioning unit close by that could be redirected to this drain, you could provide an air gap at the furnace, then tie into the vertical upright of trap if your local codes allow it.
I am describing the 3/4″ drain pipe for the A coil pan. If no can do, then make a point of pouring water into the trap periodically.
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