The refrigerant oil in a compressor does not typically need to be changed on a regular schedule like other maintenance tasks. The need to change the refrigerant oil in a compressor is usually based on specific factors and conditions. Here are some guidelines:
Compressor Replacement: In some cases, when a compressor fails or is replaced due to a malfunction, the refrigerant oil should be changed. This is because contaminants or debris from the old compressor could have mixed with the oil, and it's essential to start with clean oil when installing a new compressor.
Refrigerant Leak: If there is a refrigerant leak in the system, it can lead to a loss of refrigerant oil as well. In such situations, when the leak is repaired, the refrigerant oil may need to be replenished or replaced.
Maintenance and Service: During routine maintenance or service of the HVAC or refrigeration system, the technician may inspect the compressor and check the condition of the refrigerant oil. If the oil shows signs of contamination, degradation, or other issues, they may recommend changing it.
Manufacturer's Recommendations: Always follow the manufacturer's guidelines and recommendations for your specific compressor model. Some manufacturers might have specific recommendations regarding oil change intervals based on their compressor's design and usage.
System Overhaul: In cases of a significant system overhaul or repair, it might be prudent to change the refrigerant oil as a preventive measure, especially if the system has been exposed to contaminants or if there are uncertainties about the oil's condition.
Overall, changing the refrigerant oil in a compressor is not a routine maintenance task, and it should be done based on the specific needs of the system. If you suspect any issues with your compressor or HVAC system, it's best to consult a qualified HVAC technician or professional for proper assessment and advice.