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Old 05-30-2009, 09:08 AM   #16
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Condensation accumulating in dryer vent.


Is this a new high efficiency dryer.

Have you replaced the flap on the vent yet.

Is your furnace and or water heater using indoor or outdoor air for combustion.

Does your range hood put your home into a negative pressure when you use it.

Do you have a probe thermometer that you can measure the discarge temp at the dryer vent.

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Old 05-30-2009, 11:51 AM   #17
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Condensation accumulating in dryer vent.


solution would be to find a way to re vent
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Old 06-03-2009, 03:57 PM   #18
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Condensation accumulating in dryer vent.


My daughter just had the same moisture problem buildup w/in her dryer exhaust and it caused a HIGH TEMPERATURE fuse to blow and that caused the heating element to fail to make heat.

While buying the replacement part I saw an item on the parts supplier shelf that is a clothes dryer vent booster. It seems that whenever someone has a long span of exhaust duct the velocity might not carry through enough force for thorough enough drying. (That would allow lint and moisture to build up and cause deposits on the duct lining.)

The parts man said that the reason the high temp fuse blew was because of too much moisture and back pressure. The fuse is there to protect the heating element from over heating and burning out as well as to protect the unit from catching on fire. That blower assist was by Deflecto and ran for about $200 here in S.C. (On line they are cheaper!)

The fuse and thermal switch cost about $40. Replace them as a pair at the same time. I didn't buy the blower assist yet but as soon and I install new duct I will.

Hope that helps, Joe
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Old 06-03-2009, 05:34 PM   #19
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Condensation accumulating in dryer vent.


Since the water builds back up right away then Hvaclover has to be right. If it was me I'd be looking for a shorter route out for the vent that wasn't underslab. Make sure it doesn't have any traps (low spots or dips) in it because eventually they will fill with condensation.
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Old 09-07-2010, 01:39 PM   #20
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Condensation accumulating in dryer vent.


I had the exact same problem: water was seeping into my dryer exhaust underneath my slab foundation home. I was also using a pipe snake with a towel taped to the end. It was getting old.

My solution:

Buy one of those gallons of weed-killer with the pull pump at the end of the nozzle, the kind where you don't have to constantly squeeze the trigger to spray the weed-killer. Go kill some weeds with it. Then, take the pump handle and its attached hose off. Tape a nail to the end of the hose for weight. Drop it into the dryer exhaust. Use it to pump the water out of the dryer exhaust.
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Old 05-17-2012, 08:05 PM   #21
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Condensation accumulating in dryer vent.


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Originally Posted by hvaclover View Post
Your getting ground water seeping in.
I respectfully disagree. This is not a seepage problem. The problem is a simple matter of physics. I have this same problem and am currently working on a solution.

The problem is built in to the design of the vent system. You have a long tube buried in the slab, under the home, where the temperature remains cooler than ambient. Your dryer dries clothes by heating the fabric, causing the saturated water to evaporate and mix with the hot air blown into and out of the dryer chamber. That evaporated moisture has to go somewhere - it's pumped out of the drying chamber by the blower, out of the dryer through the dryer exhaust.

This hot, moist air enters that long cool tube where, just like atmospheric humidity condensing on a cool glass of water, the moisture in the exhaust air condenses on the walls inside the tube. After time, the water builds up in the tube, eventually flooding it. Remember, a full load of wet clothes can contain a gallon or more of water!

The symptoms of longer than normal drying times is due to the inability of the moisture to exit the dryer chamber. Not only is this aggravating, but it's also dangerous. Since the moisture has nowhere to go, it beings to accumulate in the dryer exhaust flex tube, flooding it, and possibly creating an electrical hazard.

What to do about it? Well, re-working the vent is the best option. Since hot air wants to rise, the best option is to vent the dryer out though the ceiling and through the roof.

I don't know yet what we'll do, but I do know what we won't do. We won't use a booster blower, 'cause there's no place in line to install it. Putting it at the dryer connection is akin to trying to get a good picture out of a bad negative. Garbage in, garbage out. There's still the issue of the moist air condensing in the tube.

I will post as we work through the problem.

Thanks....
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Old 05-17-2012, 08:27 PM   #22
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Condensation accumulating in dryer vent.


Quote:
Originally Posted by seadub2 View Post
I respectfully disagree. This is not a seepage problem. The problem is a simple matter of physics. I have this same problem and am currently working on a solution.

The problem is built in to the design of the vent system. You have a long tube buried in the slab, under the home, where the temperature remains cooler than ambient. Your dryer dries clothes by heating the fabric, causing the saturated water to evaporate and mix with the hot air blown into and out of the dryer chamber. That evaporated moisture has to go somewhere - it's pumped out of the drying chamber by the blower, out of the dryer through the dryer exhaust.

This hot, moist air enters that long cool tube where, just like atmospheric humidity condensing on a cool glass of water, the moisture in the exhaust air condenses on the walls inside the tube. After time, the water builds up in the tube, eventually flooding it. Remember, a full load of wet clothes can contain a gallon or more of water!

The symptoms of longer than normal drying times is due to the inability of the moisture to exit the dryer chamber. Not only is this aggravating, but it's also dangerous. Since the moisture has nowhere to go, it beings to accumulate in the dryer exhaust flex tube, flooding it, and possibly creating an electrical hazard.

What to do about it? Well, re-working the vent is the best option. Since hot air wants to rise, the best option is to vent the dryer out though the ceiling and through the roof.

I don't know yet what we'll do, but I do know what we won't do. We won't use a booster blower, 'cause there's no place in line to install it. Putting it at the dryer connection is akin to trying to get a good picture out of a bad negative. Garbage in, garbage out. There's still the issue of the moist air condensing in the tube.

I will post as we work through the problem.

Thanks....

After mulling it over I concur 100%. My head was in my back pocket due to health problems back then. So I agree with you whole heartedly.
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Old 05-17-2012, 09:25 PM   #23
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Condensation accumulating in dryer vent.


how do you clean your dryer vent outlet on the roof,you will have lint sticking all over the shingles
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Old 05-19-2012, 09:05 AM   #24
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Condensation accumulating in dryer vent.


Good question. Easy answer is I don't know! But that is something to consider when evaluating solutions.

BTW I contacted a contractor about re-working the vent. I explained our issue and he stated the current vent in our house is not code-compliant in our county. Will investigate and post our findings.
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Old 04-11-2014, 10:44 AM   #25
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Condensation accumulating in dryer vent.


I thought I'd chime back in with my solution, which is that we're moving to a new house.

Before we made that decision, though, we've just been using a bucket-head shopvac type deal from Home Depot. I think so much of the problem was having a cheap, low-end dryer in an interior room. We've got neighbors who have a newer dryer who aren't having the same problem, and other dryers I've looked at have boasted being able to blow hot air out for a good distance, allowing the dryer to be anywhere in the home.

Thanks for all the good suggestions, and I'm glad these problems will go away when we're able to vent the dryer straight outside in a few weeks.

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