ac turns on with furnace

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  #1  
Old 09-24-00, 07:10 AM
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I recently changed my thermostat to a lux 105/2110 series. I had the wires R,O,W,Y and G. All the wires matched up except W, the closest to it would be a w2. When I turn on the heat the AC turns on and runs the same time as the furnace, Is this a wiring issue or something else?
 
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Old 09-24-00, 08:09 AM
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Look at the thermostat ...it sounds to me like you have a heat pump type..if you have An oil or gas furnace, with a A/C coil ... you should only need R,G,Y,W, C.. I dont understand where your getting the W2 from... that for a second stage of heat..
 
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Old 09-24-00, 10:29 AM
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on the thermostat, the only options are R,B,E,O,W2,Y and G, this is a gas furnace, with a A/C coil and the thermostat is a heat pump digital mechanical thermostat.
 
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Old 09-26-00, 02:36 PM
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Hi Bill:

You can't use a heat pump thermostat on a gas furnace with A/C coil type system because a heat pump t-stat runs the compressor in both heating & cooling. You need to buy the right thermostat. Thanks. John.
 
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