I have an Ecobee EMS Si thermostat. In regards to wires. How is it possible run AC and Furnace on Y1 and the same for Y2? second stage. how do the outputs on AC and Furnace look and what is their voltage?
Y is for the AC, W is for heating. The Ecobee EMS Si thermostat already has a Y1 and Y2 terminal for 2-stage cooling. The thermostat also has W1 and W2 in the event that you have 2-stage cooling.
Standard thermostat voltage is 24VAC.
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In general, if you have just a single stage AC and a single stage furnace, you use Y1 or W1 respectively, ignoring Y2 and W2. All thermostats I've seen allow you to short the second and the first stages, but it shouldn't be necessary. At any rate, consult your manual. It all should be there.