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Old 06-20-2012, 06:55 PM   #1
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HVAC Leaking... not condensate pump


Hi,

My HVAC is leaking water. I believe it's coming from plenum, down past the blower unit to the floor. I have checked the condensate pump, and it's working... however, it seems very possible that the PVC going into the condensate pump is clogged.

I have shop vac'd it, but didn't fix it because the PVC is a Y shape with one branch going to the unit in the attic and the other to the unit in the basement. Vacuuming the end of the Y that goes to the pump probably just grabbed air from the upstairs unit since the downstairs seems clogged. (See picture)

Questions:
- How do I get access to the plenum area to see if the PVC is clogged or something else is the problem? It seems to be a large sheet metal box without any access panels. (See picture)

- Is there a better idea than vacuuming it out to remove the clog if that's it?

Thanks,
Dan
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HVAC Leaking... not condensate pump-y-shaped-pvc1.jpg   HVAC Leaking... not condensate pump-pipesintoplenum1.jpg  

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Old 06-20-2012, 07:09 PM   #2
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HVAC Leaking... not condensate pump


Cut the pvc pipe and glue a coupling back in when done.

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Old 06-20-2012, 07:23 PM   #3
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HVAC Leaking... not condensate pump


Thanks Marty! I was afraid of that... if I do it, any downside to putting in some ball valves so I can shutoff one end or the other to avoid cutting the PVC again when I need to vacuum out one side or the other?
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Old 06-20-2012, 07:28 PM   #4
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HVAC Leaking... not condensate pump


You can add a PVC T just after p-trap for inspection and clean.....I don't see the second drain port....but you can install a safe T-switch....... if overflow the t-switch will shut off the unit..... no more water everywhere.
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Old 06-20-2012, 10:04 PM   #5
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HVAC Leaking... not condensate pump


Thanks for the idea... I didn't know the Safe T type switch existed for inline with pipes... nice idea. I cut the pipe tonight and just created two separate runs (one for the upstairs and one for the downstairs) so I could easily just vacuum each out without any issues.

We'll see how it goes tomorrow when it gets hot again.

Thanks for the advice everyone!
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Old 06-21-2012, 09:20 AM   #6
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HVAC Leaking... not condensate pump


It looks like from the picture that another AC's drain ties into a lower AC"s Drain? If it does...then a clog near the condensate pump will backup to the lower ac unit.... They should be seperate drains for each AC.
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Old 06-21-2012, 11:14 AM   #7
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HVAC Leaking... not condensate pump


you can easily work the horizontal and vertical run with a drain clog remover. i'd try that before cutting into anything.

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