SystemAir MCV 15 Manuel D'installation page 21

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Only the following standard maintenance operations are necessary:
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The frequency at which the filters must be cleaned depends largely on the dirt and dust contained in
the supply air. It is, however, good practice never to allow more than 15-20 days to elapse between
one cleaning and the next.
The high efficiency EU4 (standard on the units) filters can be cleaned with compressed air blown onto
the filter in the direction OPPOSITE to the airflow when in the A/C unit (air exit side).
If, on the other hand, a vacuum-cleaner is used, then the filter should be cleaned on the other side,
where the air enters the A/C unit (air entry side).
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If the filters are too dirty, the result is:
* reduction of the airflow and of the cooling capacity
* eccessive dehumidification
* possible frosting or freezing of the cooling coil
* activation of the low pressure switch and stop of the A/C unit
* possible damage to the compressor due to refrigerant not entrirely evaporated returning as liquid.
and must always be substituted. 7KH ILOWHU FDQ QRW EH XVHG ZKHQ WKH SUHVVXUH GURS EHFRPHV WRR
In the case of BAG FILTERS (normally with efficiency of EU5 or above), these can not be regenerated
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These cleaning operations are necessarily more frequent during Winter than in Summer.
The frequency at which the humidifier must be cleaned is determined by the hours of operation and by
the characteristics of the water, in particular by the amount of scale that is deposited (hardness of the
water).
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