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Old 01-06-2012, 01:09 PM   #1
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Relay Switches for fan in ADP R series Air Handler


Fan continues to run on the HVAC unit at our home. I have researched the issue and came up with the relay switch may go bad and get stuck. I know that the handler has a time delay relay, and I would assume just a basic relay. How do I determine what switches I need to replace them both to stop the fan.

All comments would be helpful!

Thanks, Goode

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Old 01-06-2012, 04:07 PM   #2
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Relay Switches for fan in ADP R series Air Handler


if you have a control module the repaly is on the board black square cube or no board... exposed relay most likely 24V coil and pair of wires inline with the fan power Black.if your looking to stop a fan in the heating mode your looking at a diffeent speed MED LO/LO depends HI speed is for the cooling side....remove the stat off the subbase see if the fan cycles off.in the heating mode the fan is controlled from the furnace cycle within not the stat..check these http://www.bestbuyheatingandaircondi...Code=r-furnace

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