View Full Version : Can I keep fan running and have the T/S in the cooling at the same time?
05-29-2009, 12:14 AM
I know this is going to sound crazy but I just have to know. Can you put the thermostat in fan on position and cooling at the same time? The reason I ask this because I've been reading about IAQ and which I think makes a good point about keeping air circulating in your home and will your cooling come one when the T/S request it while your fan is still running? I did this and It did not work! Or do I need a T/S made to do this function? Please be easy on me!! :)
05-29-2009, 12:45 AM
depending on hardware, like enough wires from the stat to the furnace,
you can have the fan on... the control board will turn on what ever speed is connected to it.. usually a low speed.
When you turn on the AC by lowering the temp, the "cooling fan relay" is engaged so then the fan [same one of course] usually goes to the highest speed. Well whatever speed is connected.
The majority of furnaces out there have 4 speed blower motors, And will have fan....cooling.. heating.. connections.
05-29-2009, 01:07 AM
Well I have a Amana model # GUI090B30A and a LUX pro T/S and I tried this function and It did not work! I mean nothing came on It was either one position or the other! Is it maybe the unit is too old or it's not the right T/S ?
05-29-2009, 02:44 AM
your A/C dehumidifies as part of the cooling process, when you run the furnace fan continuously the warm air that goes across the coil when the condenser outside is off will pick up the moisture from the coil and pan and put it back into the airstream....do not run your fan continuously in the cooling mode, use ceiling fans for air movement
05-29-2009, 07:03 AM
They aren't always reliable.
Get your contractor out to check your system, and install a new stat.
Yes, you can run the fan 24/7 and have the A/C still work.
05-29-2009, 06:28 PM
there are a couple of reasons you might want to run "fan on". #1 to filter your air when no heat/ac are required (allergy season). #2 to even out temps in two story homes to help with stratification problems (this can help when the home might otherwise need zone control) #3 in hot weather your system will remove more heat in fan on than it will in auto mode by reducing stratification and an increased mechanical advantage of airflow pulling heat out of solid objects (walls) past the thermostat. if the lux does'nt run fan it's miswired or failed. if your condensate pan holds water have the tech fix that too.:D
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