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Thread: Help installing a Honeywell RTH8500WF?

  1. #1
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    Help installing a Honeywell RTH8500WF?

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ID:	1514I'm trying to install a Honeywell RTH8500WF wifi thermostat. I have no C wire so I'll be following the instructions in this video to use the G wire. (https://www.youtube.com/watch?v=jniws7wqeY4)

    I think I understand what I need to do in the thermostat. But in the furnace, there are already two white wires going into C, and two wires also going into Y.

    Any suggestions on what I need to do in the furnace ... ?

  2. #2
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    Make sure you turn off the power to the HVAC system if you make these changes.

    At the thermostat:
    Move the wire connected to the G terminal to the C terminal.


    At the furnace:
    Move the wire connected to the G terminal to the C terminal.
    Install a jumper between the Y terminal and the G terminal



    The two wires that you see connected to the Y terminal in the furnace are most likely the Y wire from the thermostat and the Y wire to the outdoor unit.

    The two wires that you see connected to the C terminal in the furnace are most likely the C wire from the outdoor unit and the common wire from the transformer.

  3. #3
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    Quote Originally Posted by Thermostat View Post
    Make sure you turn off the power to the HVAC system if you make these changes.

    At the thermostat:
    Move the wire connected to the G terminal to the C terminal.


    At the furnace:
    Move the wire connected to the G terminal to the C terminal.
    Install a jumper between the Y terminal and the G terminal



    The two wires that you see connected to the Y terminal in the furnace are most likely the Y wire from the thermostat and the Y wire to the outdoor unit.

    The two wires that you see connected to the C terminal in the furnace are most likely the C wire from the outdoor unit and the common wire from the transformer.
    Thanks!!! So you think it will be OK that I will end up with three wires in C and three wires in Y?

  4. #4
    Administrator

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    Quote Originally Posted by gouache23 View Post
    Thanks!!! So you think it will be OK that I will end up with three wires in C and three wires in Y?
    Yes





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