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T-Stat Replacement I am trying to replace an old t-stat with a new Ranco ETC-111000-000. The old t-stats have no idea what they are they are old and rust can't read. The old ones are hooked up with only two wires, (where i used to work and bought these from we used 4 wires so im lost) The old one has a red, yellow, and blue dot on them. Yellow is on top, blue middle and red bottom which is common. I have a Blue wire hooked up to common and a orange wire goint to yellow dot(?) on my new t-stat where do i put the orange wire at? I know blue will go to com. Thanks Brenda

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You will have to trace the wires from the source, unfortunately, the colors may not be accurate. Do you have a 24v heat and cool system? I am going assume the answer of yes, as this is the most common. If you have something different, we will need to go over this again. According to the new thermostat, the red is the power, it will come from the low output side (24volt) of the transformer. Green is blower fan, it will go to a relay that turns the fan on when the thermostat is set from auto to on. The white is heat, this will go to the pilot/ gas valve etc. Last is yellow or blue, either color is for the cool. This goes to the control for the compressor, usually the contactor.

Posted on Jan 07, 2008


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