Specifications

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6720649497 SM HP270-1 2012/09 en
4. Components Overview
4.1 Compressor
The compressor is usually driven by an engine and this unit compresses or transports the refrigerant through the
system. The main principle is that the refrigerant is compressed as it is sucked into the compressor in a gaseous
form at a low temperature from the evaporator.
Pict.27 – Compressor
It is then forwarded in gaseous form at a high temperature and high pressure to the condenser. The dimensioning
of the compressor has to be adapted to the system size. The compressor is filled with special oil for lubrication
purposes this is an important checking point for servicing.
Lubrication
Almost all refrigerant compressors contain oil, which lubricates the compressor moving parts and forms seals
between these moving parts during the compression. The oil is important to achieve high efficiency in the
compressor, but it affects negatively the heat transfer in the system.
Compressors are lubricated (Oil content - 270ml) in order to:
- reduce frictional wear on bearings and other moving parts
- cool the refrigerant gas during compression
- prevent refrigerant gas leakages
The lubrication type depends on the compressor and the manufacturer recommendations must be followed.