Refrigeration & Air Conditioning Mechanic Red Seal · Question
A refrigeration system uses a permanent split capacitor (PSC) motor for the evaporator fan. If the run capacitor is found to be faulty (open circuit), what is the most likely symptom observed?
A PSC motor relies on its run capacitor to create a phase shift to provide a rotating magnetic field and maintain efficient operation. If the run capacitor is o
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Question: A refrigeration system uses a permanent split capacitor (PSC) motor for the evaporator fan. If the run capacitor is found to be faulty (open circuit), what is the most likely symptom observed?
Answer options: ✅ The motor runs at reduced speed and draws excessive current.
- The motor hums but fails to start.
- The motor starts normally but overheats quickly.
- The motor runs in reverse direction.
Correct answer: The motor runs at reduced speed and draws excessive current.
Explanation: A PSC motor relies on its run capacitor to create a phase shift to provide a rotating magnetic field and maintain efficient operation. If the run capacitor is open, the motor will operate as a shaded-pole motor with less starting torque and reduced run efficiency, leading to lower speed and higher current draw beyond its nameplate full load amps (FLA).
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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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