Thanks Mark, the new factsheet nailed it: Heating and Cooling: 1 stage
of heating (W1) and cooling (Y1) and a second stage of either heating
(W2) or cooling (Y2). So, I have a Two stage Furnace, I wired the W2 to
the *O/B connector and it works fine....
I'm trying to make my mind about buying the Nest Thermostat for a 2
Stages heating furnace (No cooling/no heatpump). There is contradictions
and ambiguity about the 2 Stages heating support of the Nest (not the
learning model). This tread could have ...
