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Re: ONE MORE TIME...LOOK AT PHOTO. WHAT IS THIS DRAIN ?
Worked as HVAC tech. for a couple of years 95-97. At that time we were only concerned with traps on heat-pumps with the reasoning that heat-pumps have a negative pressure or suck air at the drain opening. With air sucking into the drain line it can create an air-dam, preventing the water from draining correctly. Most of the airconditioning units have positive pressure and blow out about as hard as a nat fart after the typical 20-30' of 3/4" pipe it runs thru. Nothing wrong with trapping it but not a huge deal. (Lets em know you were looking at it when you report it.)
As far as trapping the secondary line, it may be required by mfg. but without water or some liquid in it, it is a waste of PVC. I can't convince the homie to change the filter. Do you think he is going to crawl into an attic or crawlspace with his yuppie water bottle, to prime the trap?
I still worry most about what can cost the most, condensate sweating at the trap. It'll get you called back to do some drywall repair!
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