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4.2.
Hygienic instructions and requirements
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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 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, 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, DUPLEX RS5 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
downstream the heat recovery unit; in an environment with Class ETA 3 extract air the HVAC
network 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. Shut-off damper of the fresh air supply (ODA) must be thermally insulated. It is
recommended using shut-off dampers available as an accessory. It is the responsibility of the
planner / specialist installation firm to comply with this requirement.
DUPLEX series appliances have a single-stage filtration system – outdoor air (ODA), extracted
indoor air (ETA) and circulation air (IDA). Appliances in a hygienic version in compliance with
hygienic standard VDI 6022 must have at least Class ISO ePM1 50% (F7) 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% (M5) filter must be fitted in the duct upstream the outdoor air inlet into the HVAC
unit; alternatively, a Class ISO ePM10 50% (M5) filter may be installed in the HVAC unit and a
Class ISO ePM1 50% (F7) filter in the duct at the e2/SUP outlet from the unit. Note: air filters ISO
ePM10 50% (M5) and ISO ePM1 55% (F7) 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
of the HVAC network ensures positive pressure in the supply section of the appliance against the
extraction section.
4.3.
Installation
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Before installation remove the wooden transport planks.
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Appliance is installed solely in ceiling-suspended position.
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Fit the appliance in such a way that the prescribed manipulation space is observed:
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