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Fan and limit controls are devices used in heating systems, especially furnaces. They serve a dual function. The limit control portion monitors and maintains the temperature within the heating system to prevent overheating. When the temperature exceeds safe levels, it shuts off the burner. The fan control part, on the other hand, controls the operation of the blower fan, ensuring that warm air is distributed through the system efficiently and circulated into the living space.
Fan and limit controls work in tandem to maintain safe and efficient heating. When the furnace's temperature rises to a certain level, the limit control shuts off the burner to prevent overheating and potential damage. Conversely, when the temperature falls within the safe range, it allows the burner to reignite. Simultaneously, the fan control activates the blower fan, distributing warm air through the ductwork and into the living spaces. This coordinated operation ensures both safety and even heating.
If you suspect a problem with your fan and limit controls, it's essential to address it promptly to maintain the safety and efficiency of your heating system. Common signs of issues include erratic temperature fluctuations or inadequate airflow. Regular maintenance, such as cleaning and calibration checks, is crucial to ensure the controls are functioning correctly. If you're uncertain about their operation or if you encounter persistent problems, it's advisable to have a qualified HVAC technician inspect and service the controls to ensure safe and efficient heating.
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