HVAC Condensation Line Clog

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Old 09-25-17, 06:28 PM
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HVAC Condensation Line Clog

I am having an issue with my HVAC where water is backing up in the condensation line and tripping the float switch. I am assuming that there is a clog somewhere in the condensation drain line. I tried connecting a shopvac to the drain line outside and left it running for around 3 minutes but it did not pull anything out of the line (there was no water in the vac when I disconnected the hose). Could this just be a major clog?

Does anyone have any other ideas?
 
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Old 09-25-17, 06:34 PM
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Welcome to the forums.

Is there an overflow pan below the air handler where the float switch is
or is it in the drain line ?

A few pictures of your setup there would come in handy.
http://www.doityourself.com/forum/el...-pictures.html
 
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Old 09-25-17, 06:43 PM
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Picture is attached. This is where the float switch is located.
 
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Old 09-25-17, 06:44 PM
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Have you tried connecting the shop vac to the pvc T in your picture?
 
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Old 09-25-17, 06:46 PM
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Ok.... so single drain line and float switch is in the upper drain port.

Try removing the cap to the right and see if it's full of water.
 
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Old 09-25-17, 06:51 PM
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The last time that the float switch tripped, I removed the cap on the pvc T and it was full of water too.

If I pull the float switch out, the AC starts working again and the water drains out of that pipe. Afer a period of time (sometimes hours, sometimes days) it will happen again and the float switch will trip.
 
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Old 09-25-17, 07:02 PM
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I did try hooking the shopvac up to the pvc T but it didnt seem like I was able to get enough suction since the pvc flows the other way as well?
 
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Old 09-25-17, 09:20 PM
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Homewerks Worldwide 3/4 in. PVC Sch. 40 Slip x Slip Ball Valve-VBVP40E4B - The Home Depot





That is why I like installing a 3/4 inch ball valve in the drain line.
 
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Old 09-25-17, 09:46 PM
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Now that's a trap.
 
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Old 09-25-17, 09:54 PM
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Thanks,

The second opening that serves as a vent was originally by the T. When the drain backed up the homeowner would get water through the ceiling.

I added the valve , extended the vent and trapped the secondary.
I took the float switch from the secondary opening on the unit and put a float switch on the secondary pan.


No more water through the ceiling.
 
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Old 09-26-17, 03:28 AM
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I have seen some youtube videos of folks running a water hose into the drain pipe. Is this a safe option for me with my setup? I don't want to blast water back into the unit.
 
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Old 09-26-17, 11:33 AM
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Look at your setup.
If you put water into the standpipe...... where would it go ?
Towards the unit and towards the drain. So water pressure on that pipe won't work without a valve at the air handler end.

You may need to cut your 3/4" line at a place where you can connect pressure to. The PVC is easily reconnected with a coupler.
 
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