Technical characteristics of oils
1. The HFC-134a system uses synthetic (PAG) compressor oil, and in the R-12 system - mineral. These two types of oils should not be mixed.
2. Brand of compressor oil (PAG) varies depending on the compressor model. Use only the brand of oil specified for this compressor model.
Oil Handling
1. Do not allow moisture, dust, metal particles, etc. to enter the oil.
2. Do not mix oils of different brands.
3. When the oil is exposed to air for a long time, the moisture content in it increases. After refueling and adding oil, immediately close the container tightly (HFC-134a system compressor oil absorbs moisture very quickly).
4. Compressor oils should only be stored in metal containers. Storage of oils in plastic containers is prohibited.
Compressor oil level check
Oil for lubricating the compressor during its operation circulates in the system. Whenever parts of the system are replaced or a large amount of refrigerant leaks, add oil to restore its original amount. Total volume of oil in the system: 120±10cm3.
Filling the compressor with oil
Oil and refrigerant have similar properties. During normal operation, part of the oil circulates in the system along with the refrigerant. Before checking the oil level in the system or replacing any elements of the system, it is necessary to turn on the compressor for a while to ensure that the oil is charged. This procedure is performed in the following order:
1. Open all doors and engine hood.
2. Start the engine; turn the air conditioner switch to the ON position (ON) and set the fan motor control knob to the position corresponding to the maximum speed.
3. Leave the compressor running for 20 minutes at 800-1000 rpm to power the system.
4. Stop the engine.
Replacement Parts
When replacing elements of the system, it is necessary to fill in the elements to be installed with the following volumes of oil.
When replacing a compressor, subtract the amount of refrigerant drained from the removed compressor from the amount shown and drain the resulting amount from the new compressor:
Target Compressor Oil Volume - Replaceable Oil Volume = Volume of oil to be drained from the new compressor.
Note: Even if the compressor being replaced was free of oil, do not drain more than 50 cm3 of oil from the new compressor.