Gas Heat ESCO Practice Exam

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Furnace limit switches are wired in series with which component?

Blower motor
Fan relay
Gas valve
Thermostat

The correct answer is: Blower motor

Furnace limit switches are wired in series with the blower motor. This means that the limit switches are connected in a chain with the blower motor, so that they must all be activated in order to allow the blower motor to run. This ensures that the furnace is not overheating and that the blower motor is running safely. The other options, such as the fan relay and gas valve, may be wired in parallel with the limit switches, meaning they are connected separately and can operate independently. The thermostat is typically connected to the control board and does not directly affect the wiring of the limit switches.