Air conditioner blowing water into vents


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Old 08-21-09, 07:51 AM
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Air conditioner blowing water into vents

Hi all,

I have a horizontally installed Trane AC unit that is blowing water off A-Coil and into the vents. This is causing condensate to leak all over my crawl space. The condensate drain is clear and working fine.

The AC repairman says my 4-tonne unit is too big for the home (2500 sqft) and that the coils are getting too cold and thus causing the excess condensation. However, he kind of contradicted himself because he also pointed out that the temperature drop was a perfect 20 degrees between input and output of the unit. And from what I can tell 4-tonne is the correct size for a 2500 sqft (air conditioned area) home.

Does anyone have any ideas on how to fix it? It seems like it needs some sort of a filter or something to stop the condensate from blowing out.

Thanks,
Ian
 
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Old 08-21-09, 08:42 AM
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The only way to know the correct size is by doing a load calc.

Is this a new installation?
 
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Old 08-21-09, 08:49 AM
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No, the unit has been installed for about 10 years. I am a new owner of the house and I'm trying to get the crawl space dryed out.. which is a very expensive proposition with a dehumidifier when the A/C is dripping water.
 
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Old 08-21-09, 09:29 AM
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There could be many reasons for your problem. What did the tech check for?

Is the unit level?
Is the condensate line clear?
Is the condensate pan cracked?
Is the coil clean?
Is the fan speed correct?
Is the charge correct?

You may want to contact a Trane authorized dealer and have them send out there lead tech.
 
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Old 08-21-09, 09:56 AM
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Is the unit level? - Not sure on this one.
Is the condensate line clear? - Yes, verified myself.
Is the condensate pan cracked? - No, AC tech says its not. He pulled out A-Coil and inspected.
Is the coil clean? - Yes has been cleaned
Is the fan speed correct? - Not sure. Is there way to verify?
Is the charge correct? - Yes, has been checked by AC tech

At this point I've had two different companies out. The first was the company the previous owners had service their AC. They had cleared the condensate line and I assumed they did a poor job at this, so I just called them back out to make it right. They told me it was due to some insulation being caught in the A-Coil and they cleaned it out and said I should be fine. Obviously this wasn't correct. The second company, was called as part of my home warranty (I suspected a cracked drain pan at this point, which would be covered), and they have said the unit is oversized. After this, I went down and investigated myself and saw the water from the a-coil overshooting and hitting the venting.

I discussed this with the second company and they came back out this morning. They tried to adjust the tilt of the AC unit to see that would help it drain faster (however, they didn't check the current level). Tried that it didn't work. So now the tech said he would go back and discuss it with some of the other techs and see what they could come up with. He was thinking of installing some sort of a small guard to stop the water from blowing through.

I'm not sure if either of the companies (Academy Air and County Wide HVAC) are Trane authorized.
 
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Old 08-21-09, 10:49 AM
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If you call Trane they will put you in touch wiyh a Trane comfort specialist dealer. The only problem is that I can almost promise you they won't work for a home warranty company.
 
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Old 08-21-09, 11:02 AM
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Installing a gaurd, which very well may work, is not correcting the problem.

If the unit is level and the pan is fine and the line is clear I would look towards the refrigerant charge if the coil is indeed "sweating" and being blown off by the wheel. Would need to see all the relavent temp and pressure readings.
 
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Old 08-21-09, 11:59 AM
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So an oversized unit would not cause this problem?
 
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Old 08-21-09, 12:17 PM
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If unit is over sized for the duct it could cause what you are stating. Is the return duct sealed? Pulling the RH from the crawl will cause to sweat more.
 
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Old 08-21-09, 12:19 PM
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An oversized unit would short cycle and though it would deliver cool air you would not have very good humidity removal. It could contribute to what your problem is but as stated it could be many things. This type of problem can be very elusive and its difficult from behind a computor. Which is why I suggested the Trane dealer.
 
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Old 08-21-09, 01:16 PM
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How short would be considered a short cycle? If I set the A/C down a degree it takes about 30 minutes for it to stop running again.

Ian
 
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Old 08-21-09, 02:06 PM
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1 degree in 30 minutes is short.
 
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Old 08-21-09, 08:14 PM
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Do you happen to have the service manual for the Trane XL 1200? I was reading some model evaporators come with special brackets and what not for horizontal installs. Maybe one is missing on mine.
 
 

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