Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the common purpose of a crankcase heater in a refrigeration compressor?
Crankcase heaters keep the oil warm, preventing refrigerant from condensing and mixing with the oil, which can cause lubrication issues and slugging.
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Question: What is the common purpose of a crankcase heater in a refrigeration compressor?
Answer options: ✅ To prevent refrigerant migration and dilution of lubricating oil during off-cycles.
- To increase the temperature of the refrigerant before it enters the compressor.
- To reduce the compressor’s starting current.
- To dry out moisture within the compressor.
Correct answer: To prevent refrigerant migration and dilution of lubricating oil during off-cycles.
Explanation: Crankcase heaters keep the oil warm, preventing refrigerant from condensing and mixing with the oil, which can cause lubrication issues and slugging.
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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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