Combining Boiler and central air on one thermostat

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Old 09-12-14, 02:47 PM
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Combining Boiler and central air on one thermostat

I have a boiler and central air that are controlled by different thermostats. I have already run the wire to combine the two but need to know what wires to put where. I am going to use a Honeywell TH1160D thermostat.

Here is the current wiring for the AC
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and here is the wiring for the heat:
Name:  heat-wiring.jpg
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I think that I need to wire it as follows:
- remove the R/Rc jumper
- connect the red wire from the heat to the R terminal
- connect the white wire from the heat to the W terminal
- connect the red wire from the AC to the Rc terminal
- connect the blue wire from the AC to the Y terminal
- connect the green wire from the AC to the G terminal

The thing that is throwing me off is the white wire that is connected on the AC t-stat.

Can someone help as to how I should wire this?

Thanks,
Andy
 
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Old 09-12-14, 04:24 PM
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Here is the current wiring for the AC
On the A/C wiring, where is that WHITE wire going? It's typically not used for A/C. Is it just hanging inside the A/C unit?
 
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Old 09-12-14, 05:58 PM
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OK I took a look at the air handler and it does seem that the whit is not used. I have connected as I listed and left the white (AC) wire disconnected. Everything seems to be working now.

Thank You for your help,
Andy
 
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