NATE Air Conditioning and Heat Pumps Practice Exam

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Complete your NATE Air Conditioning and Heat Pumps Test. Get ready with flashcards and multiple choice questions, all with detailed hints and explanations. Achieve success on your exam!

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A resistance reading of infinity between the "R" terminal and the "S" terminal of a compressor motor indicates a(n) ____.

Grounded motor winding
Open motor winding
Shorted motor winding
Tripped internal overload

The correct answer is: Open motor winding

A resistance reading of infinity between the "R" terminal and the "S" terminal of a compressor motor indicates an open motor winding. This is because an infinite resistance means that there is no continuity in the circuit between the two terminals. In a motor winding, continuity is necessary for the electrical current to flow. If there is no path for current due to a break in the winding, it signifies that the winding is open. In the context of motor diagnostics, an open winding often results from physical damage, such as burning or breaking of the wire within the winding. Understanding this concept is crucial for troubleshooting compressor issues, as it helps technicians identify failed components that need to be replaced to restore proper function.