ABYC Air Conditioning & Refrigeration Certification Practice Exam

High or low voltage conditions can significantly impact the operation of a sealed compressor, particularly regarding the electrical performance of the motor. When the voltage supplied to the compressor is either too high or too low, it can lead to an increase in current draw.

With low voltage, the motor struggles to reach the necessary torque to operate effectively, causing it to draw more current in an attempt to maintain the desired performance. This excessive current can lead to overheating and even trip the overload protection to prevent damage to the motor.

Conversely, high voltage can cause the motor to run hotter as well because it may also lead to increased current draw beyond the motor’s designed specifications. The motor is not capable of handling these higher currents safely, which can trigger protective devices like overload relays, resulting in a shutdown of operation.

In both scenarios, the reaction to voltage fluctuations is critical to the longevity and functionality of the compressor, emphasizing the importance of ensuring stable voltage supply for safe operation.