Refrigeration & Air Conditioning Mechanic Red Seal · Question
A system's compressor is short cycling, but pressures appear normal. The most likely cause is:
If pressures are normal but the system is short cycling, it often points to a control issue, specifically a thermostat with an improperly set or failed narrow d
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Question: A system's compressor is short cycling, but pressures appear normal. The most likely cause is:
Answer options:
- A dirty condenser
- A low refrigerant charge
- A faulty low-pressure switch with a narrow differential ✅ An improperly adjusted or faulty thermostat with a narrow differential
Correct answer: An improperly adjusted or faulty thermostat with a narrow differential
Explanation: If pressures are normal but the system is short cycling, it often points to a control issue, specifically a thermostat with an improperly set or failed narrow differential, causing it to trip and restart too frequently based on slight temperature changes.
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Question explanations
- 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?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
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