Airflow Duplexvent Flexi DV1100 Instrukcja instalacji, użytkowania i konserwacji - Strona 5
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4 . D e s c r i p t i o n
4.1 General
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DUPLEXVENT Flexi series ventilation units with heat recovery are compact appliances containing in a single cabinet two
independently powered fans with flexibly mounted engines, a highly efficient heat recovery exchanger assembled from thin-
walled plastic boards for the recovery of heat/cool, a by-pass damper, slide-out filters and drainage trays, and depending on
accessories selected also an external heater, chiller, shut-off dampers, flexible flanges and a control system.
4.2 Intended use
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DUPLEXVENT Flexi series ventilation units with heat recovery are intended for the comfort ventilation and possibly hot-air
heating and cooling of flats and houses, small plants, workshops, schools, restaurants, cooking facilities and industrial halls with
a basic environment. If the appliance is used for different purposes or is not operated in compliance with instructions contained in
the operation and maintenance manual, the manufacturer is not liable for resulting damages.
5 . I n s t a l l a t i o n
5.1 Safety instructions
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During installation make sure no damage or deformation is caused to the case of the appliance (e.g. as a result of handling
operations).
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After setting the appliance in place check it for stability and secure it in this position against moving.
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During handling and installation observe all rules of safe work (including work at heights and work with suspended loads) and
use appropriate work and safety equipment.
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Lifting and binding equipment may only be operated by trained personnel.
5.2 Hygienic instructions for the appliance as per VDI 6022
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If installation is interrupted or heavy dusting occurs, cover all openings of the appliance in such a way so as to ensure that
surfaces to be in contact with transported air remain protected against the weather and stay clean and dry.
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If long-term high relative humidity (short-term more than 90 % or more than 80 % for three consecutive days) is likely to occur
with the subsequent moistening of filters (e.g. in areas with frequent fogs, frequent and long rains, flying snow etc.), suitable
measures must be taken to prevent micro-biologic growth. Recommended measures include more frequent hygienic checks as
per VDI 6022 or shorter filter replacement intervals. Another option is the preheating of air using an appropriate control device
(electrical duct heaters are an available accessory), or the appliance must be put out of operation for the period when filters are
at the risk of moistening (if the type of operation allows this).
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Should such weather conditions occur at the site of installation that would cause the dew point to be exceeded in the supply air
region of the heat recovery exchanger, or an independent cooling system is installed in ventilated rooms, DUPLEXVENT Flexi
units may only be used provided that it has been arranged via appropriate measures that the dew point will not be exceeded in
the heat recovery exchanger. The typical weather of central Europe makes this condition almost impossible.
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The e1/ODA air supply chamber has no water drain. An accessible and cleanable chamber with a drain of precipitated water
must be installed upstream the outdoor air inlet into the appliance.
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The HVAC network of appliances operated in an environment with Class ETA 2 extract air must be arranged for operation in such
a way so that positive pressure is on the supply air side of the heat recovery unit; in an environment with Class ETA 3 extract air
must be arranged for operation in such a way so that positive pressure is on the supply side against the exhaust side. This must
be ensured under all operating conditions of the system. For details see EN 13779.
In compliance with hygienic standard VDI 6022 HVAC systems must be equipped with shut-off dampers to ensure the automatic
closure of the system so that no air can flow freely through the system. It is recommended using shut-off dampers available as
an accessory. Compliance with this requirement is the responsibility of the planner / specialist installation firm.
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