In such cases, there are two power wires from the HVAC system, often called “Rh” the power wire directly from the heating system transformer, and “Rc” the power wire directly from the cooling transformer. Input 462 is from a terminal connected to the Rc wire. According to some ...
In general, it is connected to the R terminal. In modern thermostats, you can see it connected to an R terminal with a jumper to Rc (cooling) or Rh (heating), or both. The red wire can also be connected directly to the R terminal. When you see the red wire connected to the R t...
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For example, in the case of heating, the W wire is shorted to the Rh (or R or Rc depending on the configuration). In the case of cooling the Y wire is shorted to the Rc (or R or Rh depending on the configuration). By shorting these two wires, the 24 VAC transformer is placed ...