Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the primary function of a crankcase heater on a refrigeration compressor?
A crankcase heater keeps the compressor oil warm, preventing refrigerant from migrating to and diluting the oil during off-cycles.
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Question: What is the primary function of a crankcase heater on a refrigeration compressor?
Answer options: ✅ To prevent refrigerant migration and oil dilution
- To preheat the oil before startup
- To increase compressor efficiency
- To dry out moisture in the system
Correct answer: To prevent refrigerant migration and oil dilution
Explanation: A crankcase heater keeps the compressor oil warm, preventing refrigerant from migrating to and diluting the oil during off-cycles.
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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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