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3.2.

Intended use

Duplexbase PT 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 or for similar applications with a basic

environment. The use of the unit must be in compliance with the Regulation of the Commission

(EU) 1253/2014.

4 .

I n s t a l l a t i o n

4.1.

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.

4.2.

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, 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, Duplexbase PT 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 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.

Duplexvent 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% (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