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    DBONTX's Avatar
    DBONTX Posts: 1, Reputation: 1
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    #1

    Feb 5, 2011, 02:09 PM
    connecting hunter model 44110 digital thermostat
    I'm replacing a Trane MDL BAYSTAT239A mercury thermostat to a Hunter MDL 44110 digital thermostat. There is 8 wires connected to the old thermostat labeled G,O,X2,Y,T,R,W and B. I've figured out the G which is connected to the fan goes to the G on the new thermostat, Y for the A/C compressor to the Y, R to the RH for voltage, and W for the heating to the W. That leaves the RH on the new thermostat and 4 other wires. Please help. Where do the other wires go? Thanks in advance.
    repairman_red's Avatar
    repairman_red Posts: 37, Reputation: 1
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    #2

    Feb 23, 2011, 07:28 AM
    common terminal relations: g - fan, w - gas valve, y - a/c compressor contactor, o - reversing valve, x2 - secondary/emergency heat, c - common/ 24v return (on most models it's c on some it's b), r/rc/rh - all three are for power in (24 volt) there may be only one or may be two terminals for 24 volt power in; if there are two then make a small jumper to link rc and rh. Standard install uses color to letter matching: g is green, w is white, r is red, y is yellow, o is orange, common is usually black and so on. The best method is to verify what is landed at the furnace or dual fuel kit.
    hope this helps please let me know.
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