What is the method for checking refrigeration oil?
2 Answers
Refrigeration oil inspection methods can be divided into routine checks and professional inspections. For routine checks, simply observe the color - it should be clear, not cloudy, and free of sediment to be considered normal. If the oil appears emulsified or discolored, it indicates an abnormality. Professional inspections require specialized equipment to test the water content and cleanliness of the refrigeration oil. Refrigeration oil, also known as lubricating oil, is used to lubricate moving parts within refrigeration compressors. According to the standards set by the Petrochemical Industry Department, China produces five grades of refrigeration oil: No. 13, No. 18, No. 25, No. 30, and the enterprise standard No. 40.
I've been repairing cars for over a decade, and checking refrigeration oil requires some experience and tools. In the air conditioning system, refrigeration oil lubricates the compressor, and regular checks prevent wear. Methods include: first, locate the inspection port near the compressor, and use a strong flashlight or magnifying glass to observe the oil's color—fresh oil is transparent and light yellow; if it turns dark, has particles, or emits an odor, it indicates oil degradation. Checking the oil level is even more critical, requiring a professional pressure gauge connected to the high and low-pressure ports, measured at engine idle to ensure the oil quantity is within the manufacturer's specified range. Sometimes, oil quality must also be checked during refrigerant charging. DIY checks require caution to avoid liquid splashes, and if tools are incomplete, it's better left to professional shops. Neglecting checks can lead to compressor failure, and system malfunctions can be even more costly. Remember, air conditioning maintenance every two to three years includes this item, saving both worry and effort.
