On 12/14/2013 10:52 AM, Ian wrote:
I am installing a new NEST thermostat, replacing an old two wire mercury bulb furnace thermostat. There are only two unmarked wires. There's 24 V across the wires.

Can anyone tell me which letters on the NEST base (W, Y, O/B, AUX, E, G, C, etc) they will map to? It has to be the most basic of installations; open or close the circuit.

Thanks,

Ian

You'll have to read the furnished manual
(RTFM). We can tell you the traditional
color code, but yours might be different.

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Christopher A. Young
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