drain pipe design for A/C


  #1  
Old 07-05-12, 04:37 PM
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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.
 

Last edited by dderolph; 07-05-12 at 05:32 PM.
  #2  
Old 07-06-12, 03:51 PM
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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.
 
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Old 07-06-12, 05:25 PM
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I would lose the trap with that application.
 
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Old 07-06-12, 05:29 PM
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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.
 
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Old 07-06-12, 05:39 PM
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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.
 
 

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