Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is installing a new run capacitor for a single-phase fan motor. The original capacitor was rated 10 µF at 370 VAC. The replacement capacitor is rated 8 µF at 370 VAC. What is the immediate consequence of using this undersized capacitor?
An undersized run capacitor will not provide the optimal phase shift for the auxiliary winding, leading to a weaker rotating magnetic field. This results in dec
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Question: A technician is installing a new run capacitor for a single-phase fan motor. The original capacitor was rated 10 µF at 370 VAC. The replacement capacitor is rated 8 µF at 370 VAC. What is the immediate consequence of using this undersized capacitor?
Answer options: ✅ Increased motor current and potential overheating.
- Decreased motor current and reduced noise.
- Motor running in reverse rotation.
- Motor failing to start completely.
Correct answer: Increased motor current and potential overheating.
Explanation: An undersized run capacitor will not provide the optimal phase shift for the auxiliary winding, leading to a weaker rotating magnetic field. This results in decreased motor efficiency, higher slip (reduced speed), and increased current draw in the main winding to compensate, causing the motor to run hotter and potentially fail prematurely. This is a common issue with PSC motors.
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