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9 . C l e a n i n g a n d m a i n t e n a n c e
9.1. General
During the maintenance of the appliance follow instructions from the previous chapters, observe
the basic rules of safety at work and proceed in compliance with the working regulations and use
suitable means of access to the HVAC equipment (ladders, mobile stepladders, platforms etc.).
Maintenance consists particularly in the visual inspection of the appliance, a regular replacement
of air filters and cleaning the heat recovery exchanger.
Observe personal hygiene during the maintenance of the appliance. We recommend using
personal protective equipment (face masks, rubber gloves etc.).
We recommend commissioning the maintenance and cleaning of the appliance to a specialist
service company.
9.2. Cleaning the cabinet
After opening the door of the unit vacuum clean all impurities, possibly carry out wiping
disinfection.
Check the condition of the door seal.
Check the condensate drain for cleanliness and flooding. A blocked drain might cause serious
problems.
9.3. Air filters, replacing filter cassettes
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As standard, the appliance contains outdoor (e1/ODA) and extraction air filters (i1/ETA), which must
be kept dry and clean (for details see 7.1). (Please wear protective devices such as respiration
protection, gloves, etc.).
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The filters are designed to capture dust particles and thus protect your health as well as the other
parts of the appliance from contamination; therefore make sure they are control and replaced
regularly!
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Carry out filter replacement operations only provided that you do not suffer from allergies to dust
particles. Avoid replacing filters when persons with such allergies are present.
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Replacement is carried out depending on the dust load of the external and internal environment and
the subsequent contamination of filters and an increase in air resistance indicated by the differential
manostats every 500 to 2000 running hours.
The filter cassettes are replaced when the final permitted difference between filter pressures or the
time interval for replacement have been reached, or if the filters show technical or hygienic
functional defects. Earlier replacement or shorter replacement intervals are desirable if the results
of a hygiene inspection show it appropriate.
When replacing the filter cassettes, avoid the contamination of the surroundings, other air-
handling parts of the appliance as well as the rooms being ventilated. In particular make sure that
the newly installed filters have not been contaminated by dust from the old ones!
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Spare filter cassettes are to be ordered from the manufacturer. Please include in your order the
order code of the cassette (the code is shown on the identification plate of the appliance).
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After opening the unit door, slide out the contaminated cassettes from the guide rails and insert new
ones.
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During insertion make sure that the arrow showing the direction of air through the cassette is visible
from the operator´s side and always points toward the heat recovery exchanger!
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Make sure that each section (supply, exhaust) has filter cassettes with the correct filter grade as
indicated in Chapter 5.9.
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Dispose of the contaminated cassettes with general municipal waste.
Always record the date of replacement of filter cassettes in a suitable way, e.g. in the operational
logbook.
Use original filter cassettes only! If different cassettes were used, the manufacturer could not
guarantee their proper function!
9.4. Cleaning the coils (heater / chiller)
It is necessary to clean the coil when it shows only minimum signs of contamination.
After opening the door vacuum clean all impurities.
