NATE Gas Heating Practice Exam

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Study for the NATE Gas Heating Exam. Practice with interactive flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your test!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

A mid-efficiency or high-efficiency furnace will not operate if?

It is not grounded or the polarity is reversed
The indoor blower motor capacitor is wired into the wrong motor winding
The air filter is installed backwards
The door switch is shorted closed

The correct answer is: It is not grounded or the polarity is reversed

A mid-efficiency or high-efficiency furnace is designed to operate safely and effectively, and certain conditions must be met for it to function properly. When a furnace is not grounded or if the polarity is reversed, it can lead to electrical issues that may prevent the furnace from starting. Proper grounding is essential for safety, protecting both the furnace's electrical components and the individuals operating it. Additionally, reversed polarity can cause malfunctions in the control systems of the furnace, potentially leading to improper operation or failure to start. The other options describe issues that could affect furnace operation differently. However, not being grounded or having reversed polarity directly impacts the electrical safety and functioning of the furnace, making it a critical condition that would prevent the furnace from operating. Understanding these electrical requirements is vital for ensuring safe and efficient furnace performance.