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OT: HVAC?

Geo-TH,In

Geo-TH,In

Well-known Member
Which way should the air flow through the A coil? All centrals I've seen the air is pushed through the A coil from the bottom.

My SIL said his AC is leaking water on the floor. So I looked at it. At first, I thought he had a choked drain. After cleaning drain, water is still getting on the floor.

Upon closer look I noticed the blower was installed under the A coil, which is normal. However instead of blowing the air into the A coil, the blower was pulling air through the coil and pulling condensate off the A coil. The blower was wet and covered with black mold. The capacitor on blower was rusty. Blower is a 3 speed. It was on medium. I put it on low. The floor is staying dry.

The house is a story. Putting fan on low may not provide enough cooling for upstairs.

The blower needs to be removed and sanitized along with some of the duct work.

Window AC's pull air through evaporator. Under certain conditions the fan will pull condensate off evaporator, spraying on inside of unit, and black mold.

Have you ever seen a central installed this way? I can't see any good cheap solution can you?
 
One of our rentals has a downdraft furnace with A/C installed. But the evaporator is installed downstream of (below) the blower.

I can't see why the location of the blower should affect whether water is leaking. The velocity of air through the evaporator will be the same regardless of the blower location. I think the wet blower is a symptom of another problem. Is the evaporator maybe freezing up, a symptom of low refrigerant?
 
Mark
It became obvious to me the blower is pulling water off A coil and at the same time the drain has negative air pressure instead of a positive pressure to push the water out.
 
> It became obvious to me the blower is pulling water off A coil and at the same time the drain has negative air pressure instead of a positive pressure to push the water out.

Yes, if air is being sucked in the drain that would be a problem.
 
Here's what happens when you pull condensation off evaporator. Black mold all over the inside the window Ac.

The black
cvphoto36421.jpg

Stuff isn't dirt. Only bleach will remove it.

So the direction of air flow through A coil is important.
cvphoto36422.jpg
 
The filter might need service or enlargement to allow the drain to not have suction. Re-engineering it to blow through might be best, but expensive. High humidity levels are an issue in that the water removed and air cooled is what makes comfort. The water must drain. Higher blower speeds may also work if the drain issue is solved. Jim
 
Try degreasing the coil dirty. The oil wont let the water stick to the coil. They might not look dirty. Dont take much oil to do this
 
It's common for the drain to have negative pressure. That's why there is a required trap just outside the drain fitting. Once the trap is full, it will then drain properly.

But if the condensate is going airborne instead of tracking down to the drain channels, I would suspect a partially clogged coil causing areas of high velocity air to be blowing through, or the wrong blower speed, moving too much air.

That is an unusual arrangement, I have heard of down draft furnaces but never actually seen one. Sounds like it has had this problem for some time, there may not be a sure fix other than a complete new unit and rearranging the ducts for updraft.
 
This does have a trap. BIL suggests I put vent hole in elbow that sends condensat to trap.
 
Venting before the trap will defeat the purpose.

The air flowing in keeps the water pushed back, the "slurping effect".

Venting after the trap is acceptable, except it can let sewer gas in, if it drains to the sewer system.
 
Air can flow either way through the A coil. There are plenty of systems that are downdraft where the A Coil is mounted on top and air flows from the a-coil down to the blower. The main problem with this arrangement is the blower motor can be cooled down so much that humidity condenses on it. So, it is better if the blower blows the air through the coil instead of sucking it through.

You need to clean that A coil to assure that air is flowing through it freely. Spray it with some of that scrubbing bubbles stuff.

In addition you need to make sure the drain pipe is clear. Blow through it to ensure its not blocked up.

The drain needs to have a trap on it. If air is allowed to suck back through the drain pipe it pulls the water back with it and it will quickly overflow the drain pan.
 
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