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Old 09-11-2009, 09:23 AM   #16
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Bad smell from central air unit


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Originally Posted by dac122 View Post
I like this idea. Make sure whatever it is has a strong scent.
Not too strong, or you could get a false result. Just from natural infiltration from the basement to the main floor.

If the odor is coming from the sump. Its not being pulled in through a positive pressure drain line. Its from return air duct/system leaks, and or an undersized return system.

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Old 09-12-2009, 01:21 PM   #17
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Bad smell from central air unit


As dac 22 mentioned, a simple trap (Up-stream of the tee) on the condensate run should eliminate the sump smell.

As for the question about an air gap, for example... your washing machine. The plumbing waste line has a trap, then a riser in which the washer hose is inserted. The air gap is the separation between the waste-line and the washer hose.

Upon further review, of the drawing, it is likely there is already an air gap, but, there isn't any trap. Anyhow, you want to have both an air gap and a trap.

B.T., I like your advise about the Febreeze in the pit, I will have to put that one in the mental tool box.
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Old 09-13-2009, 12:25 PM   #18
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Bad smell from central air unit


So if I spray say some febreeze in through the pipe that drains into the sump pit....and that smell then comes into the house I can be pretty certain then that the smell is either the stagnant air from the basement or from the sump pit? Now how do I add a "p-trap" in the line...what do I need to do differently from how its made now?
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Old 09-13-2009, 01:08 PM   #19
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Bad smell from central air unit


Extreme;y doubtful its coming in from your positive pressure drain line(means air blows out that pipe, not drawn in).

Spray some Febreze in the sump, turn stat fan switch to on.

If no Febreze odor. Hope you have someone coming out to leak check for a gas leak.

If you get a Febreze odor. You need to seal ALL return openings in the basement and at the furnace.

P trap is self explainatory once you have it.
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Old 09-13-2009, 03:14 PM   #20
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Bad smell from central air unit


I like the advise as for sealing everything up and troubleshooting. I would definately recommend adding a p-trap. Just google p-traps, it's pretty simple.

Based on the readings, I think the smell is from the sump pit, but being there physically would help. In troubleshooting, it's a process of elimination. Make sure the gas line is sealed, make sure the coil is free of funk, and trap the condensate run.

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