Refrigeration & Air Conditioning Mechanic Red Seal · Question
A low-pressure switch (LPS) serves as a critical safety device in refrigeration systems. According to CSA B52, what is its main protective function related to refrigerant charge?
The low-pressure switch protects the compressor from operating under conditions of low suction pressure, which can occur due to insufficient refrigerant charge,
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Question: A low-pressure switch (LPS) serves as a critical safety device in refrigeration systems. According to CSA B52, what is its main protective function related to refrigerant charge?
Answer options: ✅ To protect the compressor from operating with insufficient refrigerant, preventing overheating and damage.
- To protect the compressor from excessively high discharge pressures.
- To maintain a constant suction pressure for optimal efficiency.
- To automatically add refrigerant when the system pressure drops.
Correct answer: To protect the compressor from operating with insufficient refrigerant, preventing overheating and damage.
Explanation: The low-pressure switch protects the compressor from operating under conditions of low suction pressure, which can occur due to insufficient refrigerant charge, restricted flow, or excessively low ambient temperatures. Prolonged operation at very low suction pressures can lead to compressor overheating due to lack of cooling by refrigerant gas, and potential damage to internal components.
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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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