Gas Heat ESCO Practice Exam

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A furnace nameplate specifies a temperature rise of 40 - 70 degrees. Temperature measurements indicate a rise of 80 degrees. What is the most appropriate action?

Check gas pressure
Increase fan speed
Reduce the burner size
Replace the heat exchanger

The correct answer is: Increase fan speed

When the temperature rise measured in a furnace exceeds the specified range on the nameplate, it indicates that there is an issue with the airflow through the system. Increasing the fan speed can help improve the airflow and bring the temperature rise back within the acceptable range specified on the nameplate. Checking gas pressure (Option A) could be important for ensuring proper combustion but is not the most appropriate action in this scenario where the temperature rise is high due to airflow issues. Reducing the burner size (Option C) would reduce heat output but may not address the root cause of the high temperature rise. Similarly, replacing the heat exchanger (Option D) is a more drastic measure that may not be necessary if the issue is related to airflow. Therefore, increasing fan speed (Option B) is the most appropriate action to address the high temperature rise in this situation.