2
4. Storage
Jet fans are vulnerable if stored outdoors.
At indoor storage with good ventilation
and no risk of condensation the storage
period is 6 months.
The storage location must be free from
vibrations, as these can damage the
motor bearings.
At storage longer than 3 months the fan
wheels must be turned (moved)
regularly.
During subsequent mounting the fans
must be inspected for damages and
corrosion. Ensure that the motors do not
contain condensation before start up.
5. Installation
5.1 Before installation
Unpack the jet fan by removing the top
and sides of the box. Leave the fan on the
support on which it rests.
Check that the impeller can rotate freely
in the fan casing.
Mount the enclosed suspension brackets
on either side of the fan casing. Tighten
them with a torque of at least 23 Nm.
5.2 Installation
The jet fans must be installed with an
open inlet area below the fans. The outlet
side must have a minimum of 2 m
obstruction free clearance. Obstructions
include beams, columns, and other large
objects that affect the airflow.
The fans are fitted with arrow signs
indicating the direction of airflow and
rotation.
The suspension brackets are
dimensioned to leave a minimum of
5 mm space between the ceiling and the
top of the fan casing. The brackets must
be the only contact points with the
ceiling and the 5 mm space must be
available across the entire surface. This is
to ensure the dampers work properly.
If jet fans are mounted within the fire cell
(the fire room) they must only be
installed on non-flammable ceilings/
materials and must comply with current
national regulations. Jet fans should in
general be installed so that there is no
risk of them falling down in the event of
fire.
Expansion bolts without approval for
high temperature must be of steel, be
minimum M10, and must be installed
twice as deep as required by the
approval (at least 60 mm). The static load
must not exceed a pull of 500 N.
Expansion bolts with documented load
capacity during fire must be installed
and loaded as stated in the approval.
Mount the jet fan to a horizontal plane
with a natural frequency at least 20%
from the fan rotation speed.
After final fastening of the fan check that
the impeller rotates freely in the fan
casing.
To ensure performance and sound level
the airflow must be unobstructed.
5.3 Electrical connection
The fan power cable must be wired in
compliance with current rules and
legislation.
The connection must also be performed
in compliance with current rules and
legislation and by authorised staff. The
fan is connected through the motor
protection switch based on the nominal
motor current. The connection must be
made directly in the terminal box
mounted internally below the plate
cover.
Emergency stops must be installed in
compliance with current rules and
legislation.
For connection, see fig. 4 and 5.
Figure 3.
Mount suspension brackets
A
23 Nm
Figure 4.
Circuit diagram in motor
terminal box
Figure 5.
Connections in terminal box
Tw
o speed
(Dahlander)
Max. r/min
Min. r/min
Low speed
High speed
Earth
L1 L2 L3
L1 L2 L3
A [mm]
B [mm]
C [mm]
D [mm]
E [mm]
F [mm]
G [mm]
CGF 500
1296.5
900
265
73.5
27
850
790
Figure 2.
Dimensions
A
D
E
F
G
B
C
