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Old 07-31-2008, 06:05 AM   #1
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What is normal condensation?


I live in a 10 year old modular, with a 10 year old coleman unit. The ac worked great until this year. My system needed charged, my pan drain line was clogged, but the real problem is now...My ducts have tons of condensation on them. My unit is upstairs and the vents are in my basement ceiling. The basement is being remodeled but has always been "finished" Do I need to insulate these ducts, or do I need to call a pro? If I have to call a pro what questions do I ask him? There is only 1 guy within 40 miles and I would like to seem educated on the subject, so I don't end up getting burned. Any and all is appreciated.

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Old 08-01-2008, 05:26 AM   #2
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What is normal condensation?


If the ductwork is going to be exposed, it needs to be insulated, and is probably not a bad idea iregardless. A low charge will create lower temps. for a short period of time, then quit again. Find and fix the refrigerant leak.


Last edited by 8 Ball; 08-01-2008 at 05:33 AM.
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Old 08-01-2008, 07:23 AM   #3
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What is normal condensation?


Thanks. What type of insulation, do i find the leak the same way one would find an ac leak in a car, with dye?
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Old 08-01-2008, 08:33 PM   #4
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What is normal condensation?


Well...a lot of people would use a dye, the proper way is to recover the refrigerant, then pressurize the system with nitrogen and a small amount of refrigerant, then use a electronic leak detector or soap bubbles to locate the leak.

Once it has been located it can be repaired, by brazing, reflaring or replacement. Evacuate to at least 500 microns, let it stand for at least 1hr with no rise, and recharge by weight.

Try using dish soap mixed with a little water to locate the leak, look around any connections like elbows. If you can expose the evaporator, look around the U bends, orifice or expansion valve. Look for oil, if oil is escaping from the system, so is refrigerant...bingo...theres your leak. Animal urine will destroy an outdoor condensor, look around the bottom of the outdoor unit. Unfortunately, if thats the case, its normaly not worth fixing.

Your local home improvement store, or HVAC supplier will sell a fiberglass/plastic liner that will slide over the duct runs. Its not real easy to instal, but works very well.

Good Luck.

Last edited by 8 Ball; 08-01-2008 at 08:41 PM.
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Old 08-03-2008, 01:52 AM   #5
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What is normal condensation?


Thanks 8 ball.
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