In what position are the inlet guide vanes on a centrifugal fan during startup?

Prepare for the Refrigeration and Air Conditioning Mechanics (313A) Test. Study with flashcards and multiple choice questions, hints and explanations included. Ace your exam!

During startup, the inlet guide vanes on a centrifugal fan are typically in a closed position to prevent fan overloading. This configuration is crucial because, when the fan starts, it can draw a significant amount of current, potentially leading to an overload condition if the airflow is unrestricted. By keeping the guide vanes closed, the system limits the amount of air entering the fan, thereby reducing the workload on the motor and allowing it to start safely without drawing excessive power.

Once the fan reaches a certain speed, the inlet guide vanes can then be adjusted to an open position to optimize airflow and efficiency during normal operation. This transition helps the system respond to varying load conditions while ensuring that the fan operates smoothly and within its designed parameters. Keeping the vanes closed initially is a key safety and performance feature in centrifugal fan systems.

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