In the past, the main problem of humidity of ice formation in critical areas such as expansion valves, but it also caused corrosion and damage to the motor windings. Lubricants play an important role in determining the impact of pollutants on the cooling system. Oil should remain as clean as it is, when he entered the compressor (unlike a car engine, that quickly contaminated by fuel, water, atmospheric carbon dioxide and dust). The state of the oil in the compressor, so the direct link to the physical and chemical purity of the system. Lubricating oil should be stored in tightly closed containers, excluding atmospheric moisture. Oil from ammonia systems is not re-used, if it can be properly filtered and stored in a dry place. Overheating or short circuit occurred in the coil hermetic or semi-hermetic reciprocating compressor engine will produce pollutants, including halogen acids. Eye goggles and rubber gloves when working with such a suspect oil. If it is shown that the acid, the oil must be removed and carefully disposed of and the system is thoroughly cleaned.
Moisture reacts with POE lubricants and this leads to the emergence of organic acids.
They are much weaker than halogen acids and should be considered when the level of acidity is measured using an acid test kit. However, any failure of POE is undesirable and it is recommended that the level of moisture content below 50 ppm in POE systems. Because the checkpoint have a high affinity moisture is very important to preserve the effects of oil atmospheric air to an absolute minimum. Moisture can not be fully resolved with the help of vacuum procedures and, therefore, the corresponding filter driers are always recommended. Figure 5.4 shows a typical expected moisture content of deviations in the process of installation and commssioning. Compressor, which was previously charged with PoE was due primarily to complete devices, such as the compressor is installed on the territory of the observing correct and evacuation procedures seals and, finally, with the subsequent control of moisture content is reduced to 50 ppm by land.
Proper evacuation will remove the contents of the air to the minimum possible. Oxidation and other high-temperature chemical reactions are more likely to cause damage in the presence of moisture. When the system changes from CFC or HCFC, HFC refrigerants, oil, as a rule, should be amended to POE. Original equipment manufacturers and the recommendations should seek to convert.....
Oil in Refrigerant Circuits 