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Thread: Connecting C wire in the furnace

  1. #1
    Junior Member

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    Connecting C wire in the furnace

    Hi,


    I took off my old thermostat and see a Rh/Rc, W,Y,G and a blue and brown cable not attached. I go to the furnace and see the blue and brown cable not attached to anything, so I assume I can use this for a C cable? I'm not really sure where to attached the cable on the furance though and what type of wire i need to attach? The wiring plate on the furannce doesnt look like the ones in the videos. Could any of you check out my pictures?

    Thank you in advance!

    At my existing thermostat Click image for larger version. 

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    Where the Blue and Brown cables end at furnaceClick image for larger version. 

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    Inside furnaceClick image for larger version. 

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    I found the manual to my Furnance if that helps: http://appliance911seabreeze.com/HWC...all_models.pdf
    Last edited by coolercity; 06-01-2014 at 08:20 AM.

  2. #2
    HVAC Thermostat Specialist

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    I do not see it in your pictures but on page 14 of your attached link there is a blue wire from the transformer that connect to the GND (Ground) terminal. Connect your common wire from the thermostat to the GND terminal.

    What thermostat are you installing?

  3. #3
    Junior Member

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    I have the honeywell $100 wifi thermostat

    I'm kinda new for furnaces (obviously). I'm not sure what a transformer looks like and there are several blue cables in the furnace. Any hints?

    Thanks!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by coolercity; 06-01-2014 at 11:35 AM.

  4. #4
    HVAC Thermostat Specialist

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    Make sure that you reinstalled the furnace door. On Most furnaces the door has a switch that will prevent the system from running if the door is not installed.


  5. #5
    Junior Member

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    Crises adverted, one of the cables got loose on the connection to the thermostat.

    I'm kinda new for furnaces (obviously). I'm not sure what a transformer looks like and there are several blue cables in the furnace. Any hints?

    Thanks!

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