Gas Heat ESCO Practice Exam

A furnace nameplate specifies a temperature rise of 40 to 70 degrees. Temperature measurements indicate a rise of 80 degrees. The most appropriate action is to:

1. decrease fan speed

2. increase fan speed

3. check thermostat settings

4. replace air filters

The correct answer is: decrease fan speed

The most appropriate action is to decrease the fan speed. This is because the furnace nameplate specifies a temperature rise of 40 to 70 degrees, and the temperature measurement indicates a rise of 80 degrees. This means that the fan speed is too high, causing the temperature to rise above the recommended range. Increasing the fan speed (option B) would only worsen the issue, as it would further increase the temperature rise. Checking the thermostat settings (option C) may be a good idea, but it is not the most appropriate action in this scenario as the problem lies with the fan speed. Replacing the air filters (option D) may also help improve the furnace's efficiency, but it would not directly address the issue of the temperature rise. Therefore, the best course of action is to decrease the fan speed in order to bring the temperature back within the recommended range.