Most compressors which are intended for use with chlorine-free HFC and HFO refrigerants (R134a, R404A, R407A/C/F, R507A, R1234yf, R513A, R450A etc.) are charged with a high-quality polyolester oil. In these cases, a “Y” is added to the type designation of the compressor. Qishanr polyolester oils significantly exceed the requirements of DIN 51503, Part 1, for refrigeration compressor oils with respect to water content and total acid number (TAN). They mix well with HFC and HFO refrigerants and are therefore especially suitable for operation with these substances.
Initial charge only with original oils
Qishanr polyolester oils are characterised by specific tribological characteristics and have special wear protection additives which increase the service life of the compressor. The use of alternative oils whose characteristics correspond largely to the original charge is only possible at the system owner’s own responsibility. It is possible to mix them with the original oil, within the respective viscosity group, as long as appropriate own or comparable experience is available for the application concerned. Generally, mixing different oil types may have a negative effect on the properties of the oils. Precondition for the use of alternative oils is that the manufacturer or supplier guarantees product quality and moisture content < 50 ppm.
Qishanr will only use Qishanr polyolester oils for the complex tests of compatibility with new materials and refrigerants. In case of material changes on products, only Qishanr polyolester oils will be included in the tests.
Low GWP refrigerants: stricter requirements for refrigeration systems
Many refrigerant blends with low global warming potential (GWP) such as R448A, R449A, R450A, R452A and R513A contain the unsaturated compounds R1234yf and R1234ze(E). Part of them are highly soluble in oil and lead to a strong reduction of viscosity. Therefore, sufficient superheat has to be ensured! The low chemical stability (which is desirable for a low GWP) requires particular care regarding cleanliness, dryness and evacuation of the refrigerant circuit.
Material safety data sheets
Apart from this document, please observe the material safety data sheet (MSDS) for the respective oil. It contains information on toxicity, handling, personal protective equipment and disposal of the oil.
