NATE Gas Heating Practice Exam

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How does the flame sensor operate?

It shuts down the gas if the flame is lost
It senses the heat of the flame
It creates an electrical path between the rod and burner
It ensures the burner flame is constant

The correct answer is: It creates an electrical path between the rod and burner

The flame sensor is a crucial safety component in gas heating systems, primarily functioning to ensure that a flame is present during operation. It creates an electrical path between the sensor rod and the burner, which is essential for the sensing mechanism to work. When the flame is present, it allows current to flow through the sensor; if the flame goes out, the current stops, leading to a shutdown of the gas supply as a safety measure. This is why the operation of the flame sensor directly relates to its ability to establish this electrical connection. By understanding its role in creating a pathway for electricity between the rod and burner, one can appreciate its function in monitoring the presence of a flame and ensuring system safety.