6
medium, the appliance must be drained of the remaining heating medium, dried properly and
disconnected from power supply.
2.2.
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,
Duplexvent
units may only be used provided that it has been
arranged via appropriate measures that the dew point is not 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 in comparison to the exhaust side.
This
must be ensured under all operating conditions of the system. For more details see EN
13779.
●
Unpack and install air filters in the last step, just before putting the appliance into operation. You
will
prevent the filters from getting dirty.
●
Air duct including accessories with autonomous regulation of operation is to be connected on the
fresh air supply. Such duct will, in compliance with the regulation VDI 6022, provide for
appropriate
treatment of supplied fresh air to prevent air filter from getting wet. In case the duct is
not connected
or if it does not include such accessory, the appliance is to be put out of operation
as long as the
risk of air filters to get wet persists (thick fog, snowing).
Ü
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. We recommend using shut-off dampers available as an accessory. It is the responsibility
of
the planner / specialist installation firm to comply with this requirement.
Ü
Duplexvent
series appliances have a single-stage filtration system. Appliances in a hygienic version
in compliance with hygienic standard VDI 6022 must have a Class F7 / 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, an
M5 / ePM10 50% / ePM10 50% Class filter must be fitted in the duct upstream the outdoor air inlet
into the HVAC unit; alternatively, an M5 / ePM10 50% Class filter may be installed in the HVAC
unit
and an F7 / ePM1 50% Class filter in the duct at the e2/SUP outlet from the unit. Note: M5 /ePM10
50% and F7 / ePM1 55% filters are separately supplied accessories.
Ü
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.
