air conditioner in attic

I went to look at a house that had an inspection done on it and I got hold of the inspection report too. The report mentioned that in the attic the horizontal a/c unit is cooling correctly but there is a little standing water in the safety drain pan. I checked the water and it is barely enough to drain out the pan's drain pipe. What might cause some water in the drain pan if it's cooling correctly (per the inspector) ? I know in my own home, the horizontal a/c unit in the attic does not normally have water in its pan.
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pan oriented incorrectly (not sloped enough to drain tube) or clogged tube?
nate
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Doug wrote:

The pan is a backstop to the normal condensate drain. The only time there should be water in the pan is when the condensate drain is clogged, usually with a algae glob.
Fortunately, this is no biggie. Get rid of the clog via compressed air (or just putting your mouth on the drain pipe and blowing really hard), snake, or dumping 1/2 cup of bleach down the pipe.
While you're fiddling with the drain pipe, this is a good excuse to install a universal coupling or two to make access to the blocking mess easier.
At the start of each A/C season (like now) we dump a cup of bleach in the evaporator unit as a algae-preventative measure. The house smells really clean for about an hour.
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Often, installers will put in a primary drain, and a secondary pan under. If the primary drain is clogged or running slow, the condensate will go into the secondary pan / secondary drain. Sounds like the primary drain needs to be cleaned out. Or, the primary pan is rusted and leaking.
Christopher A. Young Learn more about Jesus www.lds.org .
I went to look at a house that had an inspection done on it and I got hold of the inspection report too. The report mentioned that in the attic the horizontal a/c unit is cooling correctly but there is a little standing water in the safety drain pan. I checked the water and it is barely enough to drain out the pan's drain pipe. What might cause some water in the drain pan if it's cooling correctly (per the inspector) ? I know in my own home, the horizontal a/c unit in the attic does not normally have water in its pan.
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wrote:

Rather than name everyone... thanks all who replied. Appreciate the help.
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On 4/18/2012 2:49 PM, Doug wrote:

To keep the drain lines clear, I use a controlled released pad that will prevent algae from clogging drains. I install them in customer's air handlers whenever I clean one. Here's a link to the product I use.
http://www.algaeguard.us /
TDD
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