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    WilliamHarper's Avatar
    WilliamHarper Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jul 2, 2010, 03:32 PM
    Carrier abcd bus conversion to RWYG?
    I have a Carrier Infinity (with the ABCD Bus wiring system) that has died, and I want to replace it with another, standard thermostat. Is there a way to convert the ABCD to standard wiring? Thanks!
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Jul 2, 2010, 06:54 PM

    Carrier model #, inside unit?
    Is the ABCD bus used on the outdoor unit?
    Model # of the outdoor unit?
    Your sure this isn't a heat pump?

    eBay usually sells the control: carrier infinity thermostat items - Get great deals on Home Garden, Business Industrial items on eBay.com!

    If the ABCD bus is used on the outdoor unit, you may have a problem making it work.

    In general, Carrier provides the standard terminals on the control board, but to select a conventional stat, I believe the outdoor unit has to use C & Y, not 100% sure.

    You would also need to know the stages of heat and the stages of cool to pick the right stat.

    If you only have 4 wires, you may be relying on batteries if there are not enough wires run to support a common terminal.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #3

    Sep 11, 2010, 07:16 AM
    No, that system is communicating and can't be used with a conventional stat as far I know.
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