What component is wired in series with the anticipator on a mid-efficiency induced draft furnace?

In a mid-efficiency induced draft furnace, the component that is wired in series with the anticipator is the integrated circuit board. The anticipator is part of the thermostat system, and its purpose is to help regulate the furnace's operation by controlling the timing and temperature settings.

The integrated circuit board acts as the control center of the furnace, processing signals from the thermostat (including the anticipator) and managing various components such as the ignition system, fan, and safety mechanisms. When the anticipator detects a need for heating, it sends a signal to the integrated circuit board, which then initiates the operation of the furnace.

The other options, while important components in the operation of a gas furnace, do not function in the same series manner with the anticipator. The transformer is responsible for converting electrical power, while a relay is typically used for switching. The pressure switch is essential for safety, ensuring the draft inducer operates properly but does not interact with the anticipator in terms of direct series wiring. Therefore, the integrated circuit board's role is crucial in the systematic functioning of the furnace alongside the anticipator.