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    eyeski's Avatar
    eyeski Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Nov 24, 2007, 06:55 AM
    Chronotherm IV display goes blank when ac activated
    I was changing out an old mercury switch dial thermometer for my AC to a chromotherm IV T8600D2028. I wired it as instructed with Y to Y, G to G, and R to Rc with a jumper to R. They also give a resistor to wire between Y and W. With this configuration the thermostat activates the AC but then goes blank. If I wire it without the resistor the same thing happens. Is there a common I should have connected to the thermostat? And if so how do I find it? Any thoughts?
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #2

    Nov 24, 2007, 04:04 PM
    You may need a common wire to the thermostat.
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