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Old 06-29-2013, 10:24 PM   #1
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Acoil Question


Got a new high efficiency furnace and AC system. When mounting the ACoil on top of the furnace (Upflow) there is a slight negative slope away from the pan drain pipes. The AC mechanic suggested having the connections face forward, if it were the other way around I'd have a positive slope towards the pan drain. Is this an issue?

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Old 06-29-2013, 10:31 PM   #2
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What in the world are you saying that there is a Negative or positive slope? Is that a new term they are teaching in school as to if you are going downhill, you are going Positive with gravity, but going uphill, or against gravity, you are going negative.

Either say that the pan is sloping towards the piping or tilted upwards, where the water is gathering on the opposite side of the pan, so it is not leaving the pan completely.

It really should either be flat if the pan has a tilt towards the pipe fitting, if the pan is flat, there should be a tilt towards the pipe tubing connection, so water leaves.

There is no term negative or positive used, unless you are talking about DC voltage circuits, or pressure in a room.

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Old 06-30-2013, 01:44 AM   #3
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Originally Posted by gregzoll View Post
What in the world are you saying that there is a Negative or positive slope? Is that a new term they are teaching in school as to if you are going downhill, you are going Positive with gravity, but going uphill, or against gravity, you are going negative.

Either say that the pan is sloping towards the piping or tilted upwards, where the water is gathering on the opposite side of the pan, so it is not leaving the pan completely.

It really should either be flat if the pan has a tilt towards the pipe fitting, if the pan is flat, there should be a tilt towards the pipe tubing connection, so water leaves.

There is no term negative or positive used, unless you are talking about DC voltage circuits, or pressure in a room.
It is difficult to tell weather or not the pan has a slope by design, if it did I would imagine it would be marked so you would know how to orient it during install. The way the furnace that the Acoil sits on top of is designed there is a piece of sheet metal that covers the surface that raises the Acoil housing enough to slant the unit backwards so that water will build up in the rear of the pan. So should I compensate for this slope?
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Old 06-30-2013, 09:01 AM   #4
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You don't want water sitting in the pan. It's going to get funky and that funk will be in the air when it runs.
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Old 06-30-2013, 10:51 AM   #5
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If it is not sitting so the slope is towards the exit point, that means the furnace is probably not level. Check the furnace for level with at least a 3 foot level, then go from there. As for getting the pan to slope towards the exit point, that means adding shims maybe.

Mine is actually sitting on two aluminum pipes we had from an old flag pole that mounted to the side of the house. it has held up for over three years, and will hold up for another twenty if we leave it like that, and the slope is perfect.
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