Refrigeration & Air Conditioning Mechanic Red Seal · Question
What is the primary function of a crankcase heater in a refrigeration compressor?
A crankcase heater keeps the compressor oil warm, preventing liquid refrigerant from migrating to the colder crankcase and diluting the oil during off cycles.
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Question: What is the primary function of a crankcase heater in a refrigeration compressor?
Answer options:
- To reduce refrigerant leakage ✅ To prevent liquid refrigerant from dissolving in the oil
- To increase the compressor's efficiency
- To warm the compressor during operation
Correct answer: To prevent liquid refrigerant from dissolving in the oil
Explanation: A crankcase heater keeps the compressor oil warm, preventing liquid refrigerant from migrating to the colder crankcase 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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