SystemAir VR 300 ECV/B Installation Description page 10

Fig. 4
Fig.6
Diffusers/valves
Inlet diffusers & extract valves (Fig. 7)
Mount inlet diffusers in all living rooms, dining areas and bedrooms. Extract valves to be installed in
bathrooms, laundry room, WC and kitchen. Note: Even if the cooker hood is connected to the unit, a
separate extract valve must be installed in the kitchen.
In the VR 300 ECV/B the extract air from the cooker is led directly to the extract fan, bypassing the heat
exchanger. In order to obtain heat recovery from the basic ventilation, the extract valve in the kitchen must
be connected to pos.9, fig.3. together with extract from the wet rooms.
Note! The cooker hood must be equipped with a damper leaving no opening in closed position
(without opening for basic ventilation). Bung, provided with the cooker hood models
adaptable to the unit, must be mounted.
Extract valves can be ceiling- or wall mounted. Inlet diffuser should be mounted in the ceiling. Make sure
that the air stream from inlet diffusers has a free passage.
Air stream from inlet diffuser mounted on the wall (where the ceiling is horizontal), must have throw length,
so that the air is supplied to the room alongside the ceiling. Air supply through extract valves will ensure
an air stream with throw length, and extract louvers can therefore be used as inlet diffusers when mounted
in the wall close to the ceiling. Use frames to ease the removing of diffusers for cleaning.
For basic setting of inlet diffusers, open core of the diffuser 5-7 turns from closed position. Lock by means
of centre nut. For basic setting of extract louvers, open core of the diffuser 10 turns from closed position.
Lock by means of centre nut.
Setting of air volume
For adjustment of air volumes to each separate room, setting on diffusers/valves are to be made in
accordance with calculations made during designing of the ventilation system or during commissioning of
the system (special measuring equipment required).
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VR 300 ECV/B
206552 (12-12-2012)
Fig.5
10
Installation description
Systemair AB