Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the purpose of a crankcase heater on a refrigeration compressor?
Crankcase heaters keep the compressor oil warm, preventing refrigerant from condensing in the oil during shutdown, which could lead to oil foaming and lubricati
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Question: What is the purpose of a crankcase heater on a refrigeration compressor?
Answer options: ✅ To prevent refrigerant migration and dilution of oil during off-cycles.
- To increase the compressor's efficiency during operation.
- To warm up the compressor oil before startup in cold weather.
- To prevent the compressor from operating when the ambient temperature is too low.
Correct answer: To prevent refrigerant migration and dilution of oil during off-cycles.
Explanation: Crankcase heaters keep the compressor oil warm, preventing refrigerant from condensing in the oil during shutdown, which could lead to oil foaming and lubrication issues on startup.
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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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