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The filter elements in the air conditioning system are either called
filter-dryers or accumulators depending on the type of system
used. The task of the filter-dryer is to remove impurities from the
refrigerant and dehumidify it. The liquid refrigerant enters the
filter-dryer, flows through a hygroscopic filter and emerges from
the filter-dryer again in liquid form. The upper part of a filter-dryer
simultaneously serves as a compensation chamber, the lower part
as a refrigerant store in order to compensate fluctuations in pressure
in the system. Depending on its design, the filter-dryer can
only remove a certain amount of humidity - then the drying
medium is saturated and no longer in a position to absorb
further humidity. For this reason, the filter-dryer usually has to be
replaced every 2 years or every time the refrigerant circuit is
opened. Excessive ageing of the filter-dryer can lead to
considerable faults in the air conditioning system.
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