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    motorcycledave1's Avatar
    motorcycledave1 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 29, 2009, 05:12 PM
    Trane thermostat 5 wire versus 3 wire
    Hi,

    Maybe this is discussed in here elsewhere, but I didn't find it.

    I want to replace a Trane TCONT802AS32DAA 5 wire thermostat with a Trane TCONT900AC43UAA 3 wire. Is this possible? The current wiring is

    Red wire to RC with a jumper to R
    White wire to W1
    Yellow wire to Y
    Green wire to G
    Blue wire to B

    It is connected to Trane XV90 furnace and XL14i A/C unit.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 29, 2009, 05:17 PM
    It looks like the one you are using now is setup for a heat pump. The 3 wire thermostat you want to use will not work in that case. If you have just a plain A/C then it still will not work since you will have no Green connection for the blower.
    tech23's Avatar
    tech23 Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Dec 25, 2011, 10:29 AM
    Yes it is possible. U have to install a relay panel to tell the tcon900 that the equiptment is not communicating equiptment. Tcon 802 and 900 are the same thermostat except the 900 is for new communicating systems. If you want to upgrade try the tcon950 with the relay panel. It has many more great features and it is very easy to navigate.
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