Ducting; Duct Connections; Silencers; Condensation/Heat Insulation - SystemAir VR 300 ECV/B Installation Description

Ducting

General
Air to and from the unit is led through a duct system. To ensure a long life and satisfactory cleaning
possibilities, ducts made of galvanised steel (Spiro) are highly recommended.
Short pieces (max. 1m) of flexible aluminium ducting can be used for connection of the unit to roof
unit/wall grill.
To obtain high efficiency, low energy consumption and required airflow, the duct system should be
commissioned for low air speeds and a low pressure drop.
NOTE!

If the VR 300 ECV/B is not connected to a cooker hood, the connector (pos.7, fig. 3) on the
unit must remain plugged

Do not connect tumble dryer to the ventilation system. Use separate duct from the dryer to
the outdoors

Duct connections/duct ends should be covered during storage and installation.

Grill for discharge/roof unit must also be installed according to building regulations in
force.

Duct connections

Secure all joints between ducting and Tee-pieces, duct connectors, reducers etc. by means of special
tape or 3 pcs. Self-drilling screws per joint. "Telescopic joint" on Villavent Zoom duct must be taped (fig.4).

Silencers

To avoid fan noise being transferred to rooms, install sound attenuators (pos.1, fig.5) on connectors for
inlet air and extract air on the unit. (L = 1,0m). Not from cooker hood.
To avoid noise being transferred between rooms via the duct system and also to reduce noise from the
duct system itself, installation of sound attenuators before every inlet diffuser is recommended.
Flexible ducting
Flexible ducting (pos. 2, fig. 5) to be used only for connections between the unit and roof unit/grill for
outdoor air intake.

Condensation/heat insulation.

Outdoor air duct and discharge ducts must always be well insulated against condensation (fig.6). Correct
insulation installation on ducts connected to the unit is especially important. All ducting installed in cold
rooms/areas must be well insulated. Use insulating covering (minimum 100 mm mineral wool) with plastic
diffusion barrier. In areas with extremely low outdoor temperatures during the winter, additional insulation
must be installed. Total insulation thickness must be at least 150 mm.
NOTE! If the unit is installed in a cold place make sure that all joints are covered with insulation,
and tape well.
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VR 300 ECV/B
206552 (12-12-2012)
9
Installation description
Systemair AB