NATE Gas Heating Practice Exam

How is a heat anticipator wired in relation to the "W" terminal?

1. In series with the "W" terminal

2. In parallel with the "W" terminal

3. In series with the "R" terminal

4. In parallel with the "R" terminal

The correct answer is: In series with the "W" terminal

The heat anticipator is wired in series with the "W" terminal for a specific reason related to its function within a heating system. The "W" terminal is typically used to activate the heating device, such as a furnace, when there is a demand for heat. The heat anticipator, which is a part of the thermostat, is designed to slightly pre-heat the system to prevent overshooting the desired temperature setpoint. When the thermostat calls for heat, current flows through the heat anticipator along with the "W" terminal. This series configuration allows the anticipator to govern the heating operation more effectively. If the anticipator were in parallel with the "W" terminal, it could disrupt the operation of the heating cycle by allowing for possible differences in current flow and timing, ultimately leading to inaccurate temperature regulation. In summary, being in series ensures that the heat anticipator properly adjusts the heating cycle without causing potential disruptions that could arise if it were wired in parallel with the "W" terminal. This configuration enables the anticipator to work as intended, smoothing out the heating operation and enhancing comfort.