Operating and Maintenance Manual 09/2019 – part I
Screw compressors
17
dew point never decreases below 0 °C in order to prevent the condensate from
freezing inside the evaporator. The dryer runs completely automatically.
End filters of compressed air
The fine filter (type P) is made of multi-layer thick micro non-woven fabric. Using
the diffusion phenomenon on the single fibre and coalescence phenomenon, it
removes 99.9% of solid particles larger than 1micron and ensures to reach the oil
residual content downstream the filter not higher than 0.1 mg/m3 (2-ndclass in
accordance with ISO 8573.1).
It is also possible to install very fine filters (type S).
The type S filter is also made of multi-layer thick micro non-woven fabric with
better adsorption properties. It removes 99.9% of solid particles larger
than0.01micron and ensures to reach the oil residual content downstream the
filter not higher than 0.01 mg/m3 (1-stclass in accordance with ISO 8573.1).
The fine (P) and very fine (S) filters are always installed downstream the dryer.
Number of filters and their filtration accuracy is determined depending on the
requirements concerning purity of compressed air.
Automatic condensate drain
The purpose of the condensate drains is to remove the precipitated water and oil
condensate from the compressed air system.
The automatic condensate drains are connected to the dryer and filters with threaded
connector. The drain is connected with the hose to the drain ports located on the
compressor wall. In the case of the compressors on the air receiver, the hose is run
outside the machine.
1) REFRIGERANT COMPRESSOR
10) DEW POINT TEMPERATURE INDICATOR
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