Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the primary function of a potential relay in a single-phase compressor motor circuit?
A potential relay is used with capacitor-start, induction-run motors to disconnect the starting capacitor from the circuit once the motor reaches approximately
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Question: What is the primary function of a potential relay in a single-phase compressor motor circuit?
Answer options:
- To switch the run capacitor out of the circuit ✅ To switch the starting capacitor out of the circuit
- To protect the motor from overcurrent
- To maintain a constant motor speed
Correct answer: To switch the starting capacitor out of the circuit
Explanation: A potential relay is used with capacitor-start, induction-run motors to disconnect the starting capacitor from the circuit once the motor reaches approximately 75% of its full operating speed. It senses the back EMF generated by the motor to perform this function.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
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