New approach to oil regulation


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29 October 2019
German refrigeration component manufacturer AWA has developed a new oil regulation system for compressors.

The OLC system from the BITZER-owned company uses an electronic float sensor that generates an almost infinitely variable indication of oil level within the compressor. It can be used with both reciprocating and scroll compressors.
In addition to level, for the first time it also measures the speed of change of level, which can be important as an indicator of developing problems.

Power ON Logic prevents dry running during compressor startup
The Power ON Logic is activated the first time the compressor and AWA OLC are switched on. If the compressor level falls within the alarm range in less than ten seconds, the OLC immediately sprays oil into the compressor until the normal range is reached again. If the oil level does not fall within the alarm range when switching on, the Power ON monitoring is deactivated again and the OLC operates in normal mode.
Emergency Injection for sudden oil demand
When there is a sudden increase in oil demand, which can occur with frequency-modulated compressors, for example, the oil level drops abruptly from the normal to the alarm range. This rapid oil level change is detected by the OLC: It deactivates the useful delay in normal operation and injects oil immediately.
Permanent level monitoring in normal operation
For optimum lubrication of the compressor, the AWA OLC regulates its oil quantity to a level of 40 to 60%. If the value falls below the normal range, a delay counter is activated. During normal operation, this prevents the system from swinging up and the compressor from overfilling. After ten seconds the injection of oil begins. If the oil level drops below the critical range (40 to 25%) despite active filling, an alarm counter starts which switches an alarm relay after 80 seconds. This relay contact can be tapped and used, for example, to switch off the compressor or trigger an alarm routine.
  • Armaturenwerk Altenburg (AWA) was founded in 1879 and has been part of the BITZER Group since 2013.
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