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Old 05-13-2013, 09:17 PM   #1
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Thermostat wiring driving me mad

I installed a 7 day programmable thermostat for my mom at the end of fall last year. I thought I had everything hooked up correctly until she needed the A/C. I don't know why this is racking my brain so much. But I just can't seem to figure out how to wire it. The furnace and the fan work. I messed around with it today and I got the A/C running using the setup pictured. The a/c did run, but the fan on the a/c unit turned off and I could hear the compressor still going (is that normal?) it's only 72 out. I realized I didn't pull the number 3 jumper, so I pulled it. It's working, but since there wasn't a wiring diagram for my unit, I just wanted to have a seasoned pros take a look at what I did. Feel free to make fun if I did something stupid.

Oh and that is orange hooked up to the yellow.

I have it turned off until I can actually figure this out, going to be 90 tomorrow and the HVAC guy I usually use can't be out until Thursday.

Any help would be very very appreciated.

Installation Manual:

Pictures: The wiring diagram made was using the current wire setup in the home, the only thing I don't seem to understand is the actual connection to the thermostat.


BatHunters is offline   Reply With Quote
Old 05-13-2013, 09:45 PM   #2
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Furnace - Stat
R-R (24 volts)
W-W (heat)
Y-Y (cool)
G-G (fan)
C-C (common, for digital stats)

Furnace to outside Condensing unit
Y to either low voltage wire
C to either low voltage wire

so you are going to have two wires on the Y terminal of the furnace and two to the C terminal if you're using a c from furnace to the stat. if no common to the stat from furnace then only the C from the furnace to the condensing unit. It does not matter which wire you connect to at the condenser from the furnace, meaning the y and c can go to either low voltage wire in the condenser.

i don't think you're even messing with the condensing unit outside, but most likely you messed it up in the furnace. anyways, hope that helps.


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Old 05-13-2013, 10:46 PM   #3
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There should be a jumper from RH to RC on the thermostat.
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