drain pipe design for A/C

Does the drain pipe for a home A/C need the curve in it like drain pipes for kitchen and bathroom sinks? I see no need for it but I am no expert on A/C installations.

I recently became aware that the pipe was clogged. Consequently, water backed up in the A/C unit on the furnace and water was coming out where it should not have been.

I recall that, during my 22 years of living in this home, that happened once before and I cleaned the pipe and reinstalled it. But, could a straight pipe be used? That would reduce or eliminate the likelihood of clogging.



Edit: FYI, the furnace and A/C are located in a utility room along with a washer and dryer. The floor has a drain. The A/C drain pipe is simply routed into that drain.

 

yes, it should have the trap so you are not sucking the water back into the pan and so that you dont waste cold air out the drain line.

 

I would lose the trap with that application.

 

The part about " sucking the water back into the pan" doesn't make sense to me. Where the A/C drain pipe empties into the floor drain, the end of it is not immersed in water. The water level in the floor pipe always stays about 2 ft. below floor level.

"dont waste cold air out the drain line" does make sense, so I might clean the pipe and re-connect it. Thanks for you reply.

 

Houston204, I did not see your post before my last post. Yeah, I'm wondering whether the waste of cold air out the drain line is very significant. I held my finger right at the pipe opening while the A/C was running. I did feel a slight coolness there; apparently, a small amount of air does flow into that pipe from the A/C.