Heat Pump Thermostat Wiring Diagrams. If you have a w2 y2 or ob wire you can put it into the ob connector if needed. Here are a number of highest rated heat pump wiring diagram pictures on internet.
A wiring diagram is a streamlined standard pictorial representation of an electrical circuit. Literally a circuit is the path that allows electrical energy to flow. 800 x 600 px source.
These two connections will ensure that there is power to the thermostat that you are.
Here a 24v transformer is used to provide the 24v ac to the whole circuit including relay contactor etc. A very first look at a circuit representation may be complex but if you could review a metro map you could review schematics. Thw wire color and terminals you gave for your old thermostat or not what we typically see if you can let me know the model of old. If you have an r rc or rh wire you can put it into the r connector on the nest thermostat.