Final answer:
An Integrated Furnace Control (IFC) uses time delays to cycle the blower motor during the heating sequence, which are different from temperature, pressure, and humidity sensors used for various other HVAC system functions.
Step-by-step explanation:
To cycle the blower motor during the heating sequence, an Integrated Furnace Control (IFC) uses Option 3: Time delays. Temperature sensors, pressure sensors, and humidity sensors are also commonly found in HVAC systems but for different functions.
For instance, temperature sensors are typically used to determine when to begin heating or cooling a space, whereas pressure sensors can be used to ensure proper airflow and system operation. Humidity sensors might be incorporated to manage the indoor humidity levels. IFCs utilize time delays to sequence the operation of the blower motor and other components to ensure efficient and safe operation of the heating system.
Heat pumps, which also feature in some HVAC systems, typically offer both heating and cooling functions by transferring thermal energy between the indoor and outdoor environments. Heat pumps are energy-efficient solutions, especially when there is a small temperature difference between the indoor space and the outdoor air—the smaller this difference, the more cost-effective the system operates due to a higher Coefficient of Performance (COP).