Red Seal Plumbing Practice Exam

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What is the white button on the front lower left corner of some furnaces equipped with a fan/limit control used for?

Resetting the system
Manually turning the fan on
Adjusting the temperature
Checking the system status

The correct answer is: Manually turning the fan on

The white button on the front lower left corner of a furnace equipped with a fan/limit control is typically used to manually turn the fan on. This is useful in situations where the fan may not automatically turn on, such as during a power outage. Option A is incorrect because while the button may reset the system, that is not its primary purpose. Option C is incorrect because adjusting the temperature is typically done through a thermostat or control panel, not a physical button on the furnace. Option D is incorrect because the button does not indicate the system status, it simply toggles the fan on or off.