What is the primary purpose of a crankcase heater on a motor compressor?

The primary purpose of a crankcase heater on a motor compressor is to keep the refrigerant boiled out of the oil. In a refrigeration system, when the compressor is not operating, refrigerant can migrate and accumulate in the crankcase oil, leading to potential issues when the compressor starts up again.

By using a crankcase heater, the oil temperature is raised, which helps to vaporize any dissolved refrigerant back into the gaseous state and prevents it from remaining in the oil. This is crucial for maintaining the proper lubrication and function of the compressor upon startup, as excess refrigerant in the oil can cause dilution, reducing its lubricating properties and potentially leading to compressor damage.

Understanding this function emphasizes the importance of maintaining proper oil conditions for the compressor's efficiency and longevity, making it a critical component in maintaining effective refrigeration system operation.