Charles McCann
I recently wired my AC unit into the Smart a/c module in my ATC. I find that the condenser (yellow wire), does not start but the fan in the furnace does run. What would be wrong with hooking the fan (green wire), up to AC#1 and the condenser wire to AC#2? The fan would start up first then 15 seconds later the condenser would start. That way the fan would not be running all the time the thermostat was calling for the AC to start.  Any advice appreciated.
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78buckshot
If you can describe your wiring I may be able to get you running. The thermostat is responsible for energizing the blower in the furnace when in ac mode, the two conductor low voltage wire running out to the condensing unit is responsible for energizing the condenser, the only conductor you need to connect to the module in your transfer switch is the "Y" wire. The module is just a switch that interrupts the "Y" signal so you want "Y" going in and back out of the module.
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woodspliter
No sure what you are wanting to stop.  I have used the AC1, 2, 3 on several jobs to cut out a heat pump on a smaller generator system.  If you cut the white wire and run it to the AC1 you will stop the complete unit.  You can also let the condenser heat pump run, if the gen is large enough and use the AC1,2,3 to disable the contactor for the electric strip heat. I am in the South and we do not have extreme cold temps usually.
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Charles McCann
That's what I have done so far , (put the smart A/C 1 in series with the condenser and thermostat with the Y wire),it works perfectly. but as I said the blower motor still runs on the furnace, while the condenser is interrupted. I don't see a reason for the furnace blower to be running at that time. I wonder if I wired the green wire in series with ac#1 and the yellow wire in series to the ac#2 then the blower would start 15  sec. before the condenser when they come back on line.
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78buckshot
Ok, now I have a better understanding of your needs, yes you can use one of the other smart terminals for the blower. As long as it is not a heat pump with electric back-up heating you will be fine.
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Charles McCann
Thank you woodspliter That's exactly what I needed. I don't know why I didn't think of that myself. Open the white or red wire and nothing works. I am using the old Honeywell mercury thermostat so removing the power won't hurt a thing.
   Thank you everyone!!
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Birken Vogt
The usual logic is to let the blower continue to run as the air movement in the house makes it feel a mite cooler and the circulation keeps temperatures balanced.  Which may or may not be of any real benefit.
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