Refrigeration & Air Conditioning Mechanic Red Seal · Question
Why would a reciprocating compressor be equipped with a crankcase heater in a low-temperature refrigeration application?
Crankcase heaters prevent refrigerant from migrating to and condensing in the compressor crankcase during shutdown, which can lead to oil dilution. This reduces
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Question: Why would a reciprocating compressor be equipped with a crankcase heater in a low-temperature refrigeration application?
Answer options: ✅ To prevent refrigerant migration and oil slugging during shutdown
- To reduce the viscosity of the compressor oil for easier starting
- To increase the condensing temperature during operation
- To prevent the compressor from freezing in cold ambient conditions
Correct answer: To prevent refrigerant migration and oil slugging during shutdown
Explanation: Crankcase heaters prevent refrigerant from migrating to and condensing in the compressor crankcase during shutdown, which can lead to oil dilution. This reduces the risk of liquid refrigerant slugging and bearing washout upon startup.
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- 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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