What does the acronym VFD stand for in HVAC controls?

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Prepare for the Building Automation Level II Exam with flashcards and multiple choice questions. Each question offers hints and explanations. Master the essentials and get exam-ready!

Multiple Choice

What does the acronym VFD stand for in HVAC controls?

Explanation:
Variable Frequency Drive is a power-electronics device used to control motor speed by varying the frequency (and voltage) of the electrical supply to an AC motor. In HVAC, this lets fans and pumps run at lower or higher speeds as needed, which saves energy, reduces noise, and smooths operation during part-load conditions. The other options aren’t standard HVAC terms: they don’t describe a device used to control motor speed. So the term that fits the acronym in this context is Variable Frequency Drive.

Variable Frequency Drive is a power-electronics device used to control motor speed by varying the frequency (and voltage) of the electrical supply to an AC motor. In HVAC, this lets fans and pumps run at lower or higher speeds as needed, which saves energy, reduces noise, and smooths operation during part-load conditions. The other options aren’t standard HVAC terms: they don’t describe a device used to control motor speed. So the term that fits the acronym in this context is Variable Frequency Drive.

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