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Verfügbare Sprachen
Verfügbare Sprachen
Fig. B Control unit
42 Alarm indicator light, (red LED)
43 ON = Operating display (green LED)
44 RESET button
45 Display, (display field)
46 Power cable (W3)
47 SETUP button
48 - Selector button
49 Shielded control cable (W2) to the
GRD unit, 6-core
50 - Selector button
51 ENTER button
Product description
GRD.. units
These roof fans are used for the controlled
extraction of air from apartments and rooms,
for example for:
● central air extraction with volumetric flows
that differ in each apartment (Centro
System) or
● air extraction from rooms and manufac-
turing areas
GRD units are developed for use in outdoor
areas (protection class IP X5).
GRD units are mounted on a roof socket, see
accessories for flat, pitched, corrugated or
trapezoidal roofs. They have a vertical,
upward air outlet and are equipped with
airstream-operated shutters.
The GRD unit is operated with the supplied
control unit (electronic constant volumetric
flow and constant pressure control unit).
Here, the specialist installer can make
important settings and adjust the unit to the
operating parameters.
GRD units can be separated locally from
the mains using the service switch [7], for
cleaning purposes for example. After
removing the unit roof [1], the lockable
service switch [7] must be set to "0" and
secured with a padlock.
Control unit
The control unit can be operated either as a
constant volumetric flow controller (operating
mode CAs) or as a constant pressure
controller (operating mode CPs).
● CAs: Constant volumetric flow, 2 different
volumetric flows can be set, e.g. for
day/night operation.
● CPs: Constant pressure, 2 different
pressures can be set, e,g, for exhaust air
systems compliant with DIN 18017.
The integrated automatic soft start and soft
stop ensures that the fan starts up and stops
in a controlled manner.
4. Technical data
See rating plate.
Dimensions and weight
● Please refer to the valid catalogue for
dimensions.
● Weight:
– GRD 22: 27 kg
– GRD 25: 31 kg
– GRD 31: 42 kg
Maximum values for volumetric flows
and static pressure
CAs
GRD 22
1400 m³h
GRD 25
1800 m³h
GRD 31
2700 m³h
5. Environmental conditions and
operating limits
● Maximum permitted temperature of the air
medium: + 50 °C
● The control unit is only approved for interior
installation.
GB
CPs
400 Pa
500 Pa
500 Pa
13
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