Central air conditioning units question

by Tim
(Waterford, MI, USA)

I have a Ducane central air conditioner unit. When it was installed the unit would blow air out the top. The last 2 summers, it now "sucks" air in and blows it downward (ie the cooling fan on the unit has somehow reversed itself).


I have not done anything to it. I don't even pull the safety fuses in the winter. I leave them in. Should I be concerned with this? Is this "normal" operation? Any help would be appreciated!!

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Supply air temp
by: Chester

55-60 F supply air temp is good, it my opinion. 62 F is not good or bad either. You probably need tech to perform maintenance and clean it. It will help the central air conditioner perform better and provide cooler supply air by cleaning the indoor and out coil.

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Supply air temp
by: Chester

At a minimum the temperature difference across a cooling coil should be 16 degrees. Your system is work at the minumum. Depending on the age of equipment, out door temperature, humidity and other factors the split may be more or less.

A newer system in Houston working properly should probably have a greater temperature split than the 16 you quoted, but would expect no greater than 22 to 25 degrees due to the relative humidity in your area. Make sure your out door coil is clean and the filters in you air handler are cleaned.

As always HVAC equipment should be serviced and repaired by qualified technicians.

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What the supply air temp?
by: Richard

If the temp at the return is 78 F, what should the temp at the supply register be? I'm getting about 62 F supply temp at the register nearest the unit. I've been told that this is not good enough. (We live in a 1,500 sq ft apartment.)

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Motor wires
by: Shawn

The condenser fan reversed itself, without someone touching it? I?m not seeing how the fan motor could reverse itself. I?m trying to get an image in my head and it not working. Yes, it possible something could have switches the condenser motor wire.

I work in residential once and the entire condenser fan suck the air from the top and blow it downward. We were taught by professor, tech and book that the fan supposed to blow air out to the top and not to the bottom.

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