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Air handler condensation

Old 07-18-2007, 06:03 PM
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Default Air handler condensation

My air handler is sweating pretty bad. The whole underside of the air handler is dripping. It's got about 3/8" water in the pan. It's really humid here in SC but something ain't right. What's the deal?
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Old 07-18-2007, 06:27 PM
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Default Re: Air handler condensation

Deodorant! Big can!

Actually, sounds like the primary pan has failed, or is full of algae. If it's a horizontal unit, the outside pan is an emergency pan, designed to do just what it is. Take the side access panel off and see where the leak/stoppage is, or better yet call a perfessional if you're unfamiliar with this.
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Old 07-18-2007, 09:13 PM
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Default Re: Air handler condensation

Check your filter.
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Old 07-18-2007, 09:45 PM
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Default Re: Air handler condensation

could be simple as dirty coils
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Old 07-18-2007, 10:20 PM
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Default Re: Air handler condensation

There should be a plastic drain pipe leading from a low spot at the bottom of the pan. It's suppose to run the condensate out of the pan either outside or to a drain. It's probably clogged and overflowing. You'll have to check the drain and unplug it and flush it with water. It's part of normal maintenance.
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Old 07-19-2007, 09:48 AM
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Default Re: Air handler condensation

Second on Mudrunner... The drain is probably clogged. You can snake it, stick something down it, or get a tablet from your heat/AC man that dissolves the stuff from the drain. it happens. Usually algae, dust, sometimes insulation falls into them as well. it is normal for the unit to have condensation.
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Old 07-19-2007, 11:07 AM
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Default Re: Air handler condensation

They sell compressed air (like the can used to clean out computer keyboards and such) with a round foam ball on the end of the nozzle. Disconnect the drain line, push the nozzle in the pipe so the foam makes a tight seal and pull the trigger. The compressed air will shoot the clog out the other end outside.
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Old 07-19-2007, 11:25 AM
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Default Re: Air handler condensation

Also at the start of each season... Strike that your down South. A few times per season you can dump some bleach down the drain to keep the smegma from growing. Some units have a P trap. It collects there on a regular basis. I have some units that require condensate pumps and that's another place for crap to grow.

Your pan should be a safety to prevent a flood. I had water sensors installed near all units that shut the unit off to prevent flooding. It's amazing how much water can be removed from the air.
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Old 07-19-2007, 11:27 AM
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Default Re: Air handler condensation

He said the air handler is sweating, thats not normal. The water in the overflow pan is from the sweat running down the unit into the pan. It's most likely sweating because air flow is restricted, its low on refrigerant, or the space temperature is being kept abnormally low.
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Old 07-19-2007, 11:46 AM
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Default Re: Air handler condensation

The object of the evaporator is to carry away the heat from the room and remove the humidity from the air. The humidity condenses on the coil and drips into the pan to be carried away by the condensate drain tube. A symptom of restricted air flow or low refrigerant is a freezing evaporator coil. Dripping from the coil is quite normal, overflow is not. The air handler itself should be well insulated so that the covers don't sweat. Not trying to rag anyone, just did enough AC service throughout my younger life and still dabble some.
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Old 07-19-2007, 11:49 AM
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Default Re: Air handler condensation

It's not a clogged drain. The airflow is not restricted. I have new filters. No filter on the air handler itself. The refrigerent was checked a couple of months ago. It was not low. The temp is set on 76 so I don;t think that's an issue. Maybe I'll check the coils for dirt this evening......
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Old 07-19-2007, 01:16 PM
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Default Re: Air handler condensation

Still sounds like leaking primary pan to me...too much water for condensation.
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Old 07-19-2007, 04:48 PM
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Default Re: Air handler condensation

Mud Runner - 7/19/2007 11:46 AM

Not trying to rag anyone, just did enough AC service throughout my younger life and still dabble some.
I dabble in it also. For the past 18 years. The last 8 as a business owner.
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Old 07-19-2007, 10:49 PM
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Default Re: Air handler condensation

Mr.Mike - 7/19/2007 5:48 PM
Mud Runner - 7/19/2007 11:46 AM Not trying to rag anyone, just did enough AC service throughout my younger life and still dabble some.
I dabble in it also. For the past 18 years. The last 8 as a business owner.
Funny you're in N.J.. I used to service the UA theaters in the tri-state area including the Iselin Drive in. Does my age show. [img]../images/emoticons/biggrin.gif[/img] I also did the conversion at the Whelan drugs store in Atlantic City from F12 to F22. [img]../images/emoticons/surprise.gif[/img]
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Old 07-20-2007, 05:42 AM
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Default RE: Air handler condensation

For some reason the air handler is too cold, short charge could give you a ball of ice on part of the coil. Last summer I had a air handler motor starting to go bad, would go off, (internal o/l ), ice up, and be running by the time I got there. Took 4 calls to change the motor. MartyD
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Old 07-22-2007, 06:50 PM
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Default Re: Air handler condensation

How do you know you don't have low air flow? Check the inlet side of the evaporator coil, could be dirty, insulation sucked in, or some other blockage. If it is partially blocked the air coming out of the vents could still seem normal.
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Old 07-22-2007, 07:17 PM
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Default Re: Air handler condensation

Low on Freon, the coils will ice up. Clogged drain tube, the pan will overflow. Could be one or both. A few drips of condensation on the outside of the handler on a really hot day is normal, but it shouldn't drip inside. Touch the outside of the handler adjacent to where the coils are. If it is really cold, your coils are iced up and you have a Freon leak. good luck.
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