Hvac Thermostat Diagram. G wire connects to g terminal and for fan operation with the green wire. White the white wire is what connects to the auxiliary heat on your system.
Carrier hvac thermostat wiring diagram wiring diagram is a simplified up to standard pictorial representation of an electrical circuit. This originates from the transformer. Rc red wire power 24 vac rh or 4 red wire jumpered power 24 vac w white wire for heating enable y yellow wire for cooling enable.
As shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals.
W2 wire connects to w2 terminal and for heat stage 2. W2 wire connects to w2 terminal and for heat stage 2. Green the green wire connects to the fan. The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system.