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4.2. Intended use
DUPLEX
VENT
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. The use of the unit must
be in compliance with the Regulation of the Commission (EU) 1253/2014. 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
•
During installation make sure no damage or deformation is caused to the case of the appliance
(e.g. as a result of handling operations).
•
After setting the appliance in place check it for stability and secure it in this position against
moving.
•
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.
•
Lifting and binding equipment may only be operated by trained personnel.
5.2. Hygienic instructions and requirements
•
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.
•
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 microbiologic 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 devices (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).
•
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, DUPLEX
VENT
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.
•
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.
•
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.
DUPLEX
VENT
series appliances have a single-stage filtration system. Appliances in a hygienic
version
in compliance with hygienic standard VDI 6022 must have at least Class ISO ePM1 50%
filter
fitted on the inlet (applies to outdoor air e1/ODA Class ODA 1 and ODA 2). When outdoor air
is
Class 3, a Class ISO ePM10 50% filter must be fitted in the duct upstream the outdoor air inlet
into
the HVAC unit; alternatively, a Class ISO ePM10 50% filter may be installed in the HVAC unit
and
a Class ISO ePM1 50% filter in the duct at the e2/SUP outlet from the unit. Note: air filters are
separately supplied accessories.
Appliances in a hygienic version in compliance with hygienic standard VDI 6022 may be operated
only if the use of recirculating air is suitable for hygienic reasons or the arrangement of operation
