FATC 59 19. PRECAUTION FOR E-COMPRESSOR LUBRICATING OIL Oil used in e-Compressor is POE (polyolester) oil grade RL68H, as it differs from the oil used in mechanical driven compressors. POE oil is very sensitive to moisture in the A/C system. Moisture can create sludge, and may cause the refrigerant system failure / reduce the electrical insulation Technician should prevent moisture ingression into the A/C system (Do not leave the HVAC components without caps) To protect the refrigerant system from moisture, a proper amount of desiccant is also required The oil used in conventional belt driven compressors is “Polyalkylene glycol” (PAG) lubricant which has very low volume resistivity (high conductive characteristic). It is strictly prohibited to mix POE oil with PAG oil Mixing of small amount of PAG oil can reduce the volume resistivity drastically. This includes any PAG oil contained in leak detection dyes, and the PAG oil that remains in the A/C service equipment hoses after use.
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