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Replacing Lennox Thermostat with Lux TX9000TS electronic t-stat

Old t-stat had :
W1, W2, X (these 3 were from same ''wire''), G, Rc, Rh (the two R's were wired together) and Y1

New Lux thermostat has available slots for:
W, Y, G, B, O, Rc, Rh, C

I have wired it using several ideas and tips found, but still have not had any luck with the system working....
one main concern is what to do with the X, and then the 2 W' they go together or??

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  • Daniel Sorrels Jan 24, 2009

    I am dealing with 6 wires and no heat pump...
    To clarify: The W2 and X, come from the same strand...
    W1, G, (Rc & Rh = 1 wire) (the R's were jumped together) and Y1 all come from a different strand.
    it is a two speed fan but I don't think this matters in this case...

  • Daniel Sorrels Jan 24, 2009

    there is one red wire that jumped to both Rc and Rh on the old t-stat, if I didn't make sense...

  • Daniel Sorrels Jan 24, 2009

    It is a two SPEED fan, not sure what you mean by two stage...
    the colors are:
    white (two of these - the W's)
    blue (two of these - one X, one G)

    So I currently have it wired as such:
    W1 to W
    Y to Y
    Red to Rc
    G (which is blue) to G

    W2 and X are not in use...still waiting for system to cycle...

  • Ken Bledsoe May 11, 2010

    So you have 6 wires normal colors are


    are these the colors you have?

  • Ken Bledsoe May 11, 2010

    Do you have just a a/c and gas heat or do you have heat pump? Also how many wires do you have sounds like by your post you have only 4 wires?


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Unless you have a 2 stage heat system, all you wire up is W1
X is typically only used for humidifiers, dehumidifiers, air cleaners adn other such accesories. If you have none of these, X is unused.

It is typical to find that the original installer wired black or brown to X at the T-stat and left it unhooked at the unit. In such case, just leave X unused.

If your wires are

And if your system is a typical furnace with airconditioner then wire it liek this,

Red to Rc
Yellow to Y
green to G
White to W1
Blue to C (common)

Your installers manual will let you know if you shouild leave the jumper between the Rc and Rh terminals.

O terminal is only used for heat pumps and getas the orange wire.

If your T-stast has batteries and does not require an external power source, then you do not have to have the blue wire to C terminal.

If for some odd reason the maqnual does not inform you obout the jumper to RC/RH Try it firt without the jumper. Run it through all cycles. If all modes do not operate, install the jumper.

Posted on Jan 24, 2009

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