Okay y'all, I am looking for some major help here...this has been perplexing me since Thursday. We do general property maintenance and repair, and call in the specialists (HVAC, plumbing, electrical) when needed and I haven't encountered this one before. Here's the knowns:
We got called to a jobsite (rental townhome) because water was dripping out of a recessed light in the basement. In looking at the area above the finished ceiling, I saw that right near that light there was water dripping from the bottom of the return venting trunk, right below where a return venting attached in. So, I called it in a needing to call an HVAC.
He came on site the next day and apparently did not see the drip and said there is no problem, must be the drain line next to it. (problem is that is the sump pump line and we tested it and it got a clean bill of health.)
So, we went back on site and cut open the ceiling below that drip. When I took off the flexible pipe from that return, the water poured out of it like Niagara Falls. I reached into the trunk and there was some water in there (the day before we had peeked in to the next return, which is the last one before it goes into the main unit, and it was bone dry.The one that is having problems is the second to last return.) I went back a few feet on the ceiling and removed a canlight and pushed up on that part of the venting and more water came pouring out...
I couldn't follow it back to see where it goes/where that register is..it is a two story townhome and I would have to open up perfectly good drywall to see what happens to it...
So, how in the heck does water get inside return venting line???? We asked a friend who is HVAC and he said maybe a kid poured water down the return register or a tub overflowed?
If the kids won't talk, and we can't waterboard them (just kidding!!!) how can I find out where that return venting goes to...I am envisioning squeezing baby powder into the return registers and waiting for a cloud to poof out of that one that I have hanging down the basement ceiling?
Thank you in advance, oh wise HVAC masters, for your pearls of wisdom...
Frustrated from banging my head on the wall for three days
Edited by freedomfive, 30 July 2011 - 08:43 PM.