Hoval RoofVent CON-9, Design Handbook

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8 Fans with variable air flow rate
If fans with variable air flow rate are installed in the
RoofVent
®
units, the air flow rate can be varied continuously
from 25…100 %. This allows:
■ Ventilation according to requirements, e. g. depending on
the CO
2
concentration in the room
■ The balancing of supply and extract air flow rates in
applications where an independent extraction system is
installed (e.g. direct exhausting by machines)
■ Particularly quiet operation of the unit with low fan speed
■ Speed switching via the operating modes (ventilation VE1
and VE2)
Note
Order the 'DigiPlus controller' option for the zone
control panel if the air flow rate is to be varied by
means of an external signal.
Technical data
Along with the air flow rate, the heating and cooling capaci-
ties, the maximum mounting height and the sound levels of
the RoofVent
®
units also change. The values applicable for
the respective air flow rate are available upon request.
9 Hydraulic assembly diverting system
Assemblies for hydraulic diverting which are optimally
matched to the units are available for easy installation of
RoofVent
®
units. Please note the following:
■ Thermally insulate the hydraulic assembly on-site.
■ To ensure correct operation, install the hydraulic assembly
horizontally.
Caution
Risk of injury from falling parts. Mount the hydraulic
assembly so that its weight does not need to be
absorbed by the coil.
Default settings for the hydraulic alignment
Read off the default settings from Diagram K5. Curves 1.0 to
4.0 correspond to the revolutions of the valve spindles of the
balancing valve; they are shown on the dial:
0.0 ___ Valve closed
4.0 ___ Valve fully open
The coil and the hydraulic assembly are already included in
the specified pressure drop. Thus, only consider the pres-
sure drop of the boiler system up to the screw connections
(Pos. 4 in Fig. K3).
Application limits
Max. operating pressure 10 bar
Heating/cooling medium temp. 2…120 °C
Ambient temperature - 5…45 °C
Maximum air humidity 95 % (29 g/m³)
Table K10: Application limits of the hydraulic assembly diverting system
Mixing valves
Supply voltage AC 24 V
Frequency 50 Hz
Control voltage DC 0…10 V
Run time of actuator < 1 s
Table K11: Technical data of the mixing valves
Options
Fans with variable air flow rate