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    Catsmine's Avatar
    Catsmine Posts: 3,826, Reputation: 739
    Pest Control Expert
    		  
    #1

    Mar 15, 2009, 03:35 PM
    thermostat wiring
    I'm trying to replace a Trane Weathertron thermostat with a Honeywell RTH3100C and the wires don't match. The instructions call for 9 wires on the Honeywell and I've only got 8.

    The Trane labels are: R, T, O, G, Y, X2, B, and W

    The Honeywell are: E, Aux, Y, G, O, L, R, B, and C

    The installation manual cross references everything but the T, but there is not a reference for the L. The Trane had a place for an F which is referenced to L but there is no wire. The wallplate has a label that says C is optional when using batteries.

    Several answers have said to tape off the T, but what goes to L?

    So far the reference looks like:

    Honeywell Trane
    E X2
    Aux W
    Y Y
    G G
    O O
    L??
    R R
    B B
    C
    T

    What goes where?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Mar 15, 2009, 07:34 PM

    HVAC 1000 handled this a few months back and I can't do better than his fine work. Try this https://www.askmehelpdesk.com/heatin...ns-167641.html
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