AC needa outdoor trap

Old 08-11-12, 06:45 PM
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AC needa outdoor trap

Hello everyone:

I moved into a house where the AC drainage pipe comes out from an exterior wall int the ground. I had to dig a hole in order for me to free the pipe. The piece of PVC is about a foot long. Someone that saw this told me that I needed to put a trap there. This trap will go up and then down.

Should I do that? Somehow it makes sense but how would it drain.

Thank you in advanced. Rafael
Old 08-12-12, 04:40 AM
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no need for a trap at that location. A trap (if needed) should be installed near the evap coil.
Old 08-12-12, 04:50 AM
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I might add that the necessity of a trap could depend on the location of the evaporator coil.
The coil is normally installed on the upstream side of the coil where a trap would prevent air from being drawn through the drain.
A less common location for the coil is after or downstream of the fan where there would be air pressure exerted on the drain making the drain function properly without a trap.

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